CN111858824B - Terrain data fusion method, device, computer equipment and storage medium - Google Patents
Terrain data fusion method, device, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a terrain data fusion method, a terrain data fusion device, computer equipment and a storage medium. The method comprises the steps of obtaining inner ring points, which are close to the outer side, of corresponding high-precision topographic data and outer ring points, which are close to the outer side, of the corresponding high-precision topographic data by utilizing the high-precision topographic data and the low-precision topographic data, obtaining topographic data to be interpolated according to the inner ring points and the outer ring points, carrying out interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, and obtaining topographic data after fusion of the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation processing. Compared with the traditional method for expanding high-precision terrains and enabling edges to be consistent with low-precision terrains, the method achieves fusion of the high-precision terrains and the low-precision terrains by interpolating to-be-interpolated terrains formed based on the inner ring points and the outer ring points, and improves fusion degree of the terrains.
Description
Technical Field
The present application relates to the field of data processing technologies, and in particular, to a terrain data fusion method, apparatus, computer device, and storage medium.
Background
In the process of topographic exploration, visual analysis is usually required to be carried out on topographic data, the topographic data is mainly acquired in a aviation form at present, the aviation is used for acquiring topographic data with different time, different areas and different precision, and in the visual analysis, the topographic data with different precision are required to be fused so as to completely analyze the topographic data. At present, a method for fusing terrain data with different precision usually expands high-precision terrain so that edges are consistent with low-precision terrain. However, this approach may lead to problems with terrain edge cliffs and cracks.
Therefore, the current terrain data fusion method has the defect of low fusion degree.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a terrain data fusion method, apparatus, computer device, and storage medium that can improve the degree of terrain data fusion.
A terrain data fusion method, the method comprising:
acquiring high-precision topographic data to be fused and low-precision topographic data to be fused;
Acquiring corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data; the inner ring point is an outer side point of the high-precision topographic data; the outer ring points are points corresponding to the low-precision topographic data after the outer side points are expanded by preset pixel values;
obtaining topographic data to be interpolated according to the inner ring points and the outer ring points;
and carrying out interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, and obtaining topographic data after fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation processing.
In one embodiment, the obtaining the corresponding inner ring point and the corresponding outer ring point according to the high-precision topographic data and the low-precision topographic data includes:
acquiring corresponding inner ring points according to the high-precision topographic data;
and acquiring corresponding outer ring points according to the high-precision topographic data and the low-precision topographic data.
In one embodiment, the obtaining the corresponding inner ring point according to the high-precision topographic data includes:
combining the plurality of high-precision surface data to obtain a combined high-precision surface data set; the high-precision surface data are obtained by converting high-precision topographic data with the same elevation value; the high-precision topographic data with the same elevation value is obtained by algebraic operation of the high-precision topographic data;
Acquiring a high-precision line data set corresponding to the high-precision surface data set;
according to the resolution ratio of the high-precision topographic data, carrying out buffer processing on the high-precision line data set to obtain a buffer surface data set; the buffer surface data set is consistent with the high-precision topographic data in size;
cutting the high-precision topographic data according to the buffer surface data set to obtain outer raster data formed by outer points corresponding to the high-precision topographic data;
and converting the data type of the outer raster data into point data to obtain the inner ring point.
In one embodiment, the obtaining the corresponding outer ring point according to the high-precision terrain data and the low-precision terrain data includes:
acquiring an edge surface data set with preset width along the edge of the high-precision surface data set; the edge surface data set is obtained by performing repeated buffering on the high-precision surface data set according to the preset pixel value and then cutting the high-precision surface data set subjected to repeated buffering;
acquiring empty raster data corresponding to the shape of the high-precision topographic data in the edge surface dataset;
updating the empty raster data according to the low-precision topographic data to obtain raster data of edge data comprising the low-precision topographic data;
And converting the raster data of the edge data comprising the low-precision topographic data into point data to obtain the outer ring point.
In one embodiment, the acquiring the edge surface dataset along the edge of the high precision surface dataset by a preset width includes:
according to the first buffer value and the resolution ratio of the high-precision topographic data, performing first buffer processing on the high-precision surface data set to obtain a first buffer surface data set;
performing second buffer processing on the high-precision surface data set according to a second buffer value and the resolution of the high-precision topographic data to obtain a second buffer surface data set;
cutting the first buffer surface data set according to the second buffer surface data set to obtain the edge data set;
the first buffer value and the second buffer value are determined according to the number of the preset pixel values, and the first buffer value is larger than the second buffer value.
In one embodiment, the obtaining the topographic data to be interpolated according to the inner ring point and the outer ring point includes:
and merging the data corresponding to the inner ring points and the data corresponding to the outer ring points to obtain the topographic data to be interpolated.
In one embodiment, the interpolating the topographic data to be interpolated according to the high-precision topographic data, and obtaining topographic data obtained by fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation, includes:
determining interpolation data according to the resolution and pixel format corresponding to the high-precision topographic data and the elevation value corresponding to each high-precision topographic data;
determining an interpolation range according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated;
according to the interpolation data, carrying out interpolation processing on the topographic data to be interpolated in the interpolation range to obtain interpolation topographic data;
updating the interpolation topographic data cut by the first buffer surface data set according to the high-precision topographic data to obtain updated interpolation topographic data;
and according to the updated interpolation topographic data, fusing the high-precision topographic data and the low-precision topographic data to obtain fused topographic data.
A terrain data fusion device, the device comprising:
the first acquisition module is used for acquiring high-precision topographic data to be fused and low-precision topographic data to be fused;
The second acquisition module is used for acquiring corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data; the inner ring point is an outer side point of the high-precision topographic data; the outer ring points are points corresponding to the low-precision topographic data after the outer side points are expanded by preset pixel values;
the third acquisition module is used for acquiring the topographic data to be interpolated according to the inner ring point and the outer ring point;
and the fusion module is used for carrying out interpolation processing on the topographic data to be interpolated according to the high-precision topographic data and obtaining topographic data obtained by fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after the interpolation processing.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when the processor executes the computer program.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described above.
According to the terrain data fusion method, the device, the computer equipment and the storage medium, the high-precision terrain data to be fused and the low-precision terrain data to be fused are obtained, the corresponding inner annular point, which is close to the outer side, of the high-precision terrain data and the corresponding outer annular point, which is close to the outer side, of the inner annular point are obtained through expanding preset pixel values or the corresponding outer annular point, which is close to the outer side, of the high-precision terrain data, the terrain data to be interpolated is obtained according to the inner annular point and the outer annular point, then interpolation processing is carried out on the terrain data to be interpolated according to the high-precision terrain data, and the terrain data after the interpolation processing is obtained based on the terrain data after the interpolation processing. Compared with the traditional method for expanding high-precision terrains and enabling edges to be consistent with low-precision terrains, the method achieves fusion of the high-precision terrains and the low-precision terrains by interpolating to-be-interpolated terrains formed based on the inner ring points and the outer ring points, and therefore the effect of improving the degree of fusion of the terrains can be achieved.
Drawings
FIG. 1 is a diagram of an application environment for a terrain data fusion method in one embodiment;
FIG. 2 is a flow diagram of a terrain data fusion method in one embodiment;
FIG. 3 is a schematic illustration of inner and outer ring points in one embodiment;
FIG. 4 is a schematic illustration of the fused terrain in one embodiment;
FIG. 5 is a program code schematic of buffer analysis in one embodiment;
FIG. 6 is a program code schematic diagram of cropping data in one embodiment;
FIG. 7 is a block diagram of raster data conversion point data, according to one embodiment;
FIG. 8 is an interface diagram of an interpolation step in one embodiment;
FIG. 9 is a program code diagram illustrating a raster data update in one embodiment;
FIG. 10 is a block diagram of a terrain data fusion device, in one embodiment;
FIG. 11 is an internal block diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The terrain data fusion method provided by the application can be applied to an application environment shown in figure 1. Wherein the terminal 102 communicates with the server 104 via a network. The terminal 102 may obtain high-precision topographic data to be fused and low-precision topographic data to be fused from the server 104, obtain, in the terminal 102, an inner ring point near the outer side corresponding to the high-precision topographic data according to the high-precision topographic data and the low-precision topographic data, and an outer ring point near the outer side corresponding to the inner ring point through expanding a preset pixel value or the low-precision topographic data, obtain, according to the inner ring point and the outer ring point, topographic data to be interpolated, and perform interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, thereby obtaining topographic data after fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation. The terminal 102 may be, but not limited to, various personal computers, notebook computers, smart phones, and tablet computers, and the server 104 may be implemented as a stand-alone server or a server cluster composed of a plurality of servers.
In one embodiment, as shown in fig. 2, a terrain data fusion method is provided, and the method is applied to the terminal in fig. 1 for illustration, and includes the following steps:
step S202, high-precision topographic data to be fused and low-precision topographic data to be fused are obtained.
The high-precision topographic data can be high-resolution topographic data, the low-precision topographic data can be low-resolution topographic data, the areas corresponding to the high-precision topographic data and the low-precision topographic data can be set according to actual conditions, the topography represented by the high-precision topographic data and the topography represented by the low-precision topographic data can be adjacent topography, and the topography with an intersecting area can also be the topography with the intersecting area, namely, the high-precision topographic data and the low-precision topographic data can be the topographic data capable of being connected and fused. The high-precision topographic data to be fused and the low-precision topographic data to be fused may be obtained from the server 104, and specifically, the terminal 102 may obtain the high-precision topographic data to be fused and the low-precision topographic data to be fused from the server 104 through a network.
Step S204, corresponding inner ring points and outer ring points are obtained according to the high-precision topographic data and the low-precision topographic data; the inner ring points are outer side points of high-precision topographic data; the outer ring points are points corresponding to low-precision topographic data after the outer side points are expanded by preset pixel values.
The inner ring points can be data points belonging to the high-precision topographic data, and the outer ring points can be data points obtained after the inner ring points are expanded; the inner ring point may be a data point associated with the high-precision topographic data, and the outer ring point may be a data point associated with the inner ring point and the low-precision topographic data, that is, specifically, the inner ring point may be a data point near the outer side in the high-precision topographic data, for example, may be an outermost side point in the high-precision topographic data, and the outer ring point may be a data point corresponding to the low-precision topographic data after the data point near the outer side in the high-precision topographic data is expanded outwards by a preset pixel value. The terminal 102 may obtain corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data, and specifically, the terminal 102 may obtain corresponding inner ring points according to the high-precision topographic data; the terminal 102 may also obtain corresponding outer ring points based on the high precision terrain data and the low precision terrain data. Wherein, the inner ring point and the outer ring point can be obtained by clipping data.
Specifically, as shown in fig. 3, fig. 3 is a schematic view of an inner ring point and an outer ring point in one embodiment. The terminal 102 may extract a vector point converted from an outermost pixel of the high-precision topographic data as an inner ring point, and may extract a vector point converted from a pixel corresponding to the same position of the low-precision topographic data from the outermost pixel after expanding the preset pixel value as an outer ring point.
Step S206, obtaining the topographic data to be interpolated according to the inner ring point and the outer ring point.
The inner ring point and the outer ring point may be data points obtained from the high-precision topographic data and the ground-precision topographic data. The terminal 102 may obtain the topographic data to be interpolated according to the inner ring point and the outer ring point. Specifically, as shown in fig. 3, the terminal 102 may combine the inner ring point data and the outer ring point data to obtain new point data, i.e. the topographic data to be interpolated. The point data may also be called as vector data, and the vector data may be data that expresses the real world in the form of points, lines and planes, and has the characteristics of obvious positioning and implicit attribute.
And step S208, carrying out interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, and obtaining topographic data after fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation processing.
The interpolation may be a method for filling gaps between pixels during image transformation, and the terminal 102 may perform interpolation processing on the topographic data to be interpolated according to high-precision topographic data, for example, may determine relevant information in an interpolation processing process according to relevant information corresponding to the high-precision topographic data, and perform interpolation processing on the topographic data to be interpolated by using the determined relevant information in the interpolation processing process. The terminal 102 may further obtain, based on the interpolated topographic data, topographic data in which high-precision topographic data and low-precision topographic data are fused, for example, the terminal 102 may update the interpolated topographic data with the high-precision topographic data and may fuse the high-precision topographic data with the low-precision topographic data with the updated topographic data.
Specifically, as shown in fig. 4, fig. 4 is a schematic diagram of the fused terrain in one embodiment. 302 is the effect of fusing by using the conventional terrain data fusing method, 304 is the fused terrain data obtained based on the interpolated terrain data after interpolation processing is performed on the terrain data to be interpolated according to the high-precision terrain data, wherein the terrain data can be raster data, that is, the terminal 102 can fuse the high-precision terrain data and the low-precision terrain data by using modes of interpolation, raster data updating and the like, so that the fusion defects of cliffs and the like are eliminated.
According to the terrain data fusion method, high-precision terrain data to be fused and low-precision terrain data to be fused are obtained, corresponding inner ring points, which are close to the outer side, of the high-precision terrain data and outer ring points, which are close to the outer side, of the high-precision terrain data are obtained according to the high-precision terrain data, the corresponding outer ring points, which are close to the outer side, are expanded by preset pixel values or correspond to the low-precision terrain data, the terrain data to be interpolated are obtained according to the inner ring points and the outer ring points, interpolation processing is carried out on the terrain data to be interpolated according to the high-precision terrain data, and the terrain data after the interpolation processing is obtained based on the terrain data after the interpolation processing. Compared with the traditional method for expanding high-precision terrains and enabling edges to be consistent with low-precision terrains, the method achieves fusion of the high-precision terrains and the low-precision terrains by interpolating to-be-interpolated terrains formed based on the inner ring points and the outer ring points, and therefore the effect of improving the degree of fusion of the terrains can be achieved.
In one embodiment, obtaining the corresponding inner ring point based on the high-precision terrain data includes: combining the plurality of high-precision surface data to obtain a combined high-precision surface data set; the high-precision surface data are obtained by converting high-precision topographic data with the same elevation value; high-precision topographic data with the same elevation value is obtained by algebraic operation through the high-precision topographic data; acquiring a high-precision line data set corresponding to the high-precision surface data set; according to the resolution ratio of the high-precision topographic data, carrying out buffer processing on the high-precision line data set to obtain a buffer surface data set; the buffer surface data set is consistent with the high-precision topographic data in size; cutting high-precision topographic data according to the buffer surface data set to obtain outer raster data formed by outer points corresponding to the high-precision topographic data; and converting the data type of the outer raster data into point data to obtain inner ring points.
In this embodiment, the high-precision surface data may be surface data corresponding to high-precision topographic data, the high-precision surface data may be obtained by converting high-precision topographic data with the same elevation value, and the high-precision topographic data with the same elevation value may be obtained by algebraic operation on the high-precision topographic data. The terminal 102 may combine a plurality of high-precision surface data to obtain a combined high-precision surface data set, where the high-precision surface data set may be a data set including one surface object formed by fusion combining a plurality of high-precision surface data. The terminal 102 may also convert the high-precision surface data set into a high-precision line data set, which may be a data set in which the high-precision terrain data is embodied in a line data type.
The terminal 102 may further perform buffering processing on the high-precision line data set, so as to generate a corresponding buffer surface data set, where the buffer surface data set may be consistent with the size of the high-precision topographic data, and a specific process of buffering processing may be shown in fig. 5, and fig. 5 is a program code schematic diagram of buffering analysis in an embodiment. The terminal 102 may perform buffering on the high-precision line data set by setting a buffer analysis parameter, such as a buffer radius, by using a method of creating a vector data set buffer.
The terminal 102 may also cut the high-precision terrain data according to the buffer surface data set, so as to obtain outer raster data formed by outer points corresponding to the high-precision terrain data, a process of cutting the data may be as shown in fig. 6, and fig. 6 is a program code schematic diagram of cutting the data in an embodiment. The terminal 102 may cut the high-precision topographic data using the buffer surface data set, and obtain data outside the cutting area after cutting, that is, outer raster data formed by outer points corresponding to the high-precision topographic data, which may specifically be a raster data set of a circle of non-null pixels outermost to the high-precision topographic data.
The terminal 102 may convert the data type of the outer raster data into point data, thereby obtaining the inner loop point. As shown in FIG. 7, FIG. 7 is a program code schematic of raster data conversion point data in one embodiment.
Specifically, the terminal 102 may perform algebraic operation on the high-precision topographic data, specifically, the datasetgrid_high, so that the elevation values of the pixels other than the null value in the high-precision topographic data in the form of raster data are the same; converting the algebraic raster data into a face data set VectorzeRegion 1; the filtering of the object can be performed on the face data set Vectorizer 1, and the object with the area smaller than a certain threshold value (such as 100 square meters) is deleted, wherein the filtering process mainly comprises deleting the object converted by a single pixel or a plurality of pixels; the terminal 102 may perform fusion and combination processing on the surfaces after the filtering processing to generate a surface data set Dissoverresult of only one surface object, and may convert the surface data set into a line data set datasetLine, and may perform buffer analysis on the line data set by a method as shown in fig. 5, where the terminal 102 may set buffering to be consistent with the resolution of the high-precision topographic data, thereby generating a surface data set InnerrRegion, and crop the high-precision topographic data using the surface data set InnerrRegion, generate a grid data set gridClip_high1 containing the outermost non-null pixel of the topographic data, and finally may convert the grid data set gridClip_high1 into a point data set by a grid conversion vector, set a grid field to be value, and generate a point data set VectorzePoint 1, thereby obtaining an inner ring point data set.
In addition, in one embodiment, before combining the plurality of high-precision surface data, the terminal 102 may further determine whether the area of each high-precision surface data is greater than a preset area, for example, may be 100 square meters, and if not, the terminal 102 may delete the high-precision surface data from the system. If so, the step of combining the high precision surface data may be continued.
According to the embodiment, the terminal 102 can obtain the inner ring point corresponding to the high-precision topographic data by using methods such as buffer analysis and cutting, so that the inner ring point can be used for fusing the high-precision topographic data and the low-precision topographic data, and the fusion degree of the topographic data is improved.
In one embodiment, obtaining the corresponding outer ring point according to the high precision terrain data and the low precision terrain data comprises: acquiring an edge surface dataset with preset width along the edge of the high-precision surface dataset; the edge surface data set is obtained by carrying out repeated buffering on the high-precision surface data set according to a preset pixel value and then cutting the high-precision surface data set after repeated buffering; acquiring empty grid data corresponding to the shape of the high-precision topographic data in the edge surface data set; updating the empty raster data according to the low-precision topographic data to obtain raster data of edge data comprising the low-precision topographic data; and converting raster data of edge data comprising low-precision topographic data into point data to obtain outer ring points.
In this embodiment, the outer ring point may be an outer side point, for example, an outermost side point, in the high-precision topographic data, and a point corresponding to the low-precision topographic data after expanding the preset pixel value. The terminal 102 may obtain the outer ring point according to the information related to the high-precision topographic data and the low-precision topographic data. The terminal 102 may obtain an edge surface dataset along a preset width of an edge of the high precision surface dataset corresponding to the high precision terrain data. The high-precision surface data set may be obtained by converting the high-precision topographic data with the same elevation value, the edge surface data set may be a surface data set corresponding to a preset pixel value of the high-precision surface data near an edge, the edge surface data set may be obtained by performing multiple buffering on the high-precision surface data set, and then cutting the buffered high-precision surface data set obtained by multiple buffering, for example, a buffered surface data set with a smaller buffering radius may be used to cut a buffered surface data set with a larger buffering radius, so as to obtain the edge surface data set.
The terminal 102 may also acquire empty raster data corresponding to the shape of the high-precision topographic data in the edge facet dataset. Specifically, the terminal 102 may crop the high-precision topographic data using the edge plane data set to obtain a gridclip_high2 that contains null pixels of the topographic data set. The terminal 102 may update the empty raster data based on the low-precision topographic data to obtain raster data including edge data of the low-precision topographic data. Specifically, terminal 102 may update the grid value of the grid data set gridclip_high2 with the low-precision terrain data. The terminal 102 may also convert the raster data of the edge data including the low-precision topographic data into dot data to obtain the outer ring point. Specifically, the terminal 102 may convert the updated grid data set gridclip_high2 into a point data set by a grid vector conversion method, where a grid field is set to value, and generate a point data set vectorzepoint 2 as a data set corresponding to the outer ring point.
Through the embodiment, the terminal 102 can obtain the outer ring point by buffering, cutting and updating the surface data set corresponding to the high-precision topographic data and using the low-precision topographic data, so that the terminal 102 can fuse the high-precision topographic data and the low-precision topographic data by using the outer ring point, and the fusion degree of the topographic data is improved.
In one embodiment, acquiring an edge surface dataset along an edge of the high precision surface dataset by a preset width includes: according to the first buffer value and the resolution ratio of the high-precision topographic data, performing first buffer processing on the high-precision surface data set to obtain a first buffer surface data set; performing second buffer processing on the high-precision surface data set according to the second buffer value and the resolution of the high-precision topographic data to obtain a second buffer surface data set; cutting the first buffer surface data set according to the second buffer surface data set to obtain an edge data set; the first buffer value and the second buffer value are determined according to the number of preset pixel values, and the first buffer value is larger than the second buffer value.
In this embodiment, the buffer value may be information about the high-precision surface data set used in the buffer analysis, for example, the buffer radius may be information about the high-precision surface data set, the first buffer value may be a buffer value used in the first buffer analysis, and the second buffer value may be a buffer value used in the second buffer analysis. The first buffer value and the second buffer value may be determined according to the preset pixel value, and the first buffer value may be greater than the second buffer value. The first buffered surface data set may be a surface data set obtained by the terminal 102 performing the first buffering process using the first buffer value, and the second buffered surface data set may be a surface data set obtained by the terminal 102 performing the second buffering process using the second buffer value.
The terminal 102 may perform a first buffering process on the high-precision surface data set according to the first buffered data value and the resolution of the high-precision terrain data, to obtain the first buffered surface data set. Specifically, the terminal 102 may perform Buffer analysis on the above-mentioned surface data set, where the Buffer radius is set to be the distance of N pixels to be extended by high resolution, and the Buffer radius may be determined according to the above-mentioned first Buffer value and the resolution of high-precision topographic data, for example, the terminal 102 may set the Buffer radius to be the resolution of n×high-precision topographic data, for example, to be extended by 100 pixels, and the resolution of high-precision topographic data is 1 meter, and then the Buffer radius is 100×1=100 meters, and store the result as the surface data set Buffer1, to obtain the above-mentioned first buffered surface data set.
The terminal 102 may perform a second buffering process on the high-precision surface data set according to a second buffering value and the resolution of the high-precision topographic data, to obtain the second buffered surface data set. Specifically, the terminal 102 may perform a Buffer analysis on the high-precision surface data set again, where the Buffer radius may be set to a distance of N-1 pixels, and since the Buffer radius is set to a resolution of n×high-precision topographic data in the first Buffer process, the Buffer radius may be set to 99 meters in the second Buffer process, and the result of the Buffer analysis may be stored as the surface data set Buffer2, to obtain the second Buffer surface data set.
The terminal 102 may also use the second buffer surface data set to crop the first buffer surface data set to obtain an edge data set. Specifically, the terminal 102 may generate the plane data set outprregion as the edge data set using the plane data set Buffer2, that is, the second buffered plane data set, which is the plane clipping plane data set Buffer 1.
According to the embodiment, the terminal 102 can cut the surface data set obtained by multiple buffering to obtain the edge data set, so that the outer ring point can be obtained according to the edge data set, the outer ring point is used for fusion of high-low precision topographic data, and the fusion degree of topographic data is improved.
In one embodiment, according to high-precision terrain data, interpolation processing is performed on terrain data to be interpolated, and terrain data after fusion of the high-precision terrain data and the low-precision terrain data is obtained based on the terrain data after the interpolation processing, including: determining interpolation data according to the resolution and pixel format corresponding to the high-precision topographic data and the elevation value corresponding to each high-precision topographic data; determining an interpolation range according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated; according to the interpolation data, carrying out interpolation processing on the topographic data to be interpolated in the interpolation range to obtain interpolated topographic data; updating the interpolation topographic data cut by the first buffer surface data set according to the high-precision topographic data to obtain updated interpolation topographic data; and according to the updated interpolation topographic data, fusing the high-precision topographic data and the low-precision topographic data to obtain the fused topographic data.
In this embodiment, the terminal 102 may obtain the topographic data to be interpolated using the inner ring point and the outer ring point. The terminal 102 may determine the interpolation data, i.e., the parameters for performing the interpolation processing, according to the relevant information corresponding to the high-precision topographic data, such as the resolution, the pixel format, the elevation value corresponding to each high-precision topographic data, and the like. And the interpolation range can be determined according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated. And then carrying out interpolation processing on the topographic data to be interpolated in the interpolation range by utilizing the interpolation data to obtain the interpolated topographic data.
Specifically, as shown in fig. 8, fig. 8 is an interface schematic diagram of the interpolation step in one embodiment. The terminal 102 may combine the outer ring point data VectorizePoint2 and the inner ring point data VectorizePoint1 into new point data VectorizePoint as the above-mentioned topographic data to be interpolated, and at the same time, the terminal 102 may set the above-mentioned interpolation data, i.e. the interpolation parameters, as shown in fig. 8, including setting the interpolation field as the field value of the above-mentioned point data set storing elevation values, and setting the resolution of the interpolation result data to the high-resolution topographic data, i.e. the resolution of the high-precision topographic data is consistent, and the pixel format is also consistent with the pixel format corresponding to the high-precision topographic data. The terminal 102 may set the search radius of the sample point search to be not smaller than the distance between the inner ring and the outer ring, so as to ensure that any position between the inner ring and the outer ring can use the inner ring and the outer ring to perform point interpolation, where the unit of the radius value is consistent with the coordinate system of the point data set, for example, if the unit is a geographic coordinate system, the unit is a degree, and if the unit is a projection coordinate system, the unit is a meter. The terminal 102 may perform a point Interpolation analysis on the merged point data set vectorzepoint 1, that is, the above-mentioned topographic data to be interpolated, according to Interpolation parameters as shown in fig. 8, to generate a result raster data set Interpolation, that is, the above-mentioned interpolated topographic data.
The terminal 102 may further update the interpolated topographic data cut by the first buffer surface dataset according to the high-precision topographic data to obtain updated interpolated topographic data, and fuse the high-precision topographic data and the low-precision topographic data according to the updated interpolated topographic data to obtain fused topographic data. Specifically, the terminal 102 may clip the interpolated raster data set with the above-mentioned face data set Buffer1 to generate the N-pixel extended raster data set gridclip_high3. As shown in FIG. 9, FIG. 9 is a program code diagram illustrating a raster data update in one embodiment. Because the interpolation is performed on the space in the inner ring point during the interpolation analysis, the obtained grid pixel value is slightly different from the original grid value of the high-precision topographic data, so that the terminal 102 can update the high-precision topographic data datasetgrid_high into the grid data set gridclip_high3 according to the method shown in fig. 9, thereby ensuring that the pixel value of the space in the inner ring point is not changed. The terminal 102 may fuse the high-precision topographic data with the low-precision topographic data by using the above-mentioned grid data set gridclip_high3 with N pixels, that is, the updated interpolated topographic data, to obtain the fused topographic data.
Through the embodiment, the terminal 102 can obtain the fused topographic data through methods such as interpolation analysis and raster data updating, so as to achieve the effect of improving the fusion degree of the topographic data.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 2 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, as shown in fig. 10, there is provided a terrain data fusion device, comprising: a first acquisition module 500, a second acquisition module 502, a third acquisition module 504, and a fusion module 506, wherein:
The first obtaining module 500 is configured to obtain high-precision topographic data to be fused and low-precision topographic data to be fused.
The second obtaining module 502 is configured to obtain corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data; the inner ring point is an outer side point of the high-precision topographic data; the outer ring points are points corresponding to low-precision topographic data after the outer side points are expanded by preset pixel values.
And a third obtaining module 504, configured to obtain terrain data to be interpolated according to the inner ring point and the outer ring point.
And the fusion module 506 is configured to perform interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, and obtain topographic data obtained by fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation processing.
In one embodiment, the second obtaining module 502 is specifically configured to obtain the corresponding inner ring point according to the high-precision terrain data; and acquiring corresponding outer ring points according to the high-precision topographic data and the low-precision topographic data.
In one embodiment, the second obtaining module 502 is specifically configured to combine the plurality of high-precision surface data to obtain a combined high-precision surface data set; the high-precision surface data are obtained by converting high-precision topographic data with the same elevation value; high-precision topographic data with the same elevation value is obtained by algebraic operation through the high-precision topographic data; acquiring a high-precision line data set corresponding to the high-precision surface data set; according to the resolution ratio of the high-precision topographic data, carrying out buffer processing on the high-precision line data set to obtain a buffer surface data set; the buffer surface data set is consistent with the high-precision topographic data in size; cutting high-precision topographic data according to the buffer surface data set to obtain outer raster data formed by outer points corresponding to the high-precision topographic data; and converting the data type of the outer raster data into point data to obtain inner ring points.
In one embodiment, the second obtaining module 502 is specifically configured to obtain an edge surface dataset with a preset width along an edge of the high-precision surface dataset; the edge surface data set is obtained by carrying out repeated buffering on the high-precision surface data set according to a preset pixel value and then cutting the high-precision surface data set after repeated buffering; acquiring empty grid data corresponding to the shape of the high-precision topographic data in the edge surface data set; updating the empty raster data according to the low-precision topographic data to obtain raster data of edge data comprising the low-precision topographic data; and converting raster data of the edge data comprising the low-precision topographic data into point data to obtain outer ring points.
In one embodiment, the second obtaining module 502 is specifically configured to perform a first buffering process on the high-precision surface data set according to the first buffering value and the resolution of the high-precision terrain data, to obtain a first buffered surface data set; performing second buffer processing on the high-precision surface data set according to the second buffer value and the resolution of the high-precision topographic data to obtain a second buffer surface data set; cutting the first buffer surface data set according to the second buffer surface data set to obtain an edge data set; the first buffer value and the second buffer value are determined according to the number of preset pixel values, and the first buffer value is larger than the second buffer value.
In an embodiment, the third obtaining module 504 is specifically configured to combine the data corresponding to the inner ring point and the data corresponding to the outer ring point to obtain the topographic data to be interpolated.
In one embodiment, the fusion module 506 is specifically configured to determine the interpolation data according to the resolution, the pixel format, and the elevation value corresponding to each high-precision topographic data; determining an interpolation range according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated; according to the interpolation data, carrying out interpolation processing on the topographic data to be interpolated in the interpolation range to obtain interpolated topographic data; updating the interpolation topographic data cut by the first buffer surface data set according to the high-precision topographic data to obtain updated interpolation topographic data; and according to the updated interpolation topographic data, fusing the high-precision topographic data and the low-precision topographic data to obtain the fused topographic data.
For specific limitations of the terrain data fusion device, reference may be made to the above limitation of the terrain data fusion method, and no further description is given here. The above-mentioned various modules in the terrain data fusion device may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 11. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a terrain data fusion method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 11 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the terrain data fusion method described above when executing the computer program.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor implements the terrain data fusion method described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method of terrain data fusion, the method comprising:
acquiring high-precision topographic data to be fused and low-precision topographic data to be fused;
acquiring corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data; the inner ring point is an outer side point of the high-precision topographic data; the outer ring points are points corresponding to the low-precision topographic data after the outer side points are expanded by preset pixel values;
Obtaining topographic data to be interpolated according to the inner ring points and the outer ring points;
performing interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, and obtaining topographic data after fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after interpolation processing, wherein the method comprises the following steps: determining interpolation data according to the resolution and pixel format corresponding to the high-precision topographic data and the elevation value corresponding to each high-precision topographic data; determining an interpolation range according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated; according to the interpolation data, carrying out interpolation processing on the topographic data to be interpolated in the interpolation range to obtain interpolation topographic data; updating the interpolation topographic data cut by the first buffer surface data set according to the high-precision topographic data to obtain updated interpolation topographic data; according to the updated interpolation topographic data, fusing the high-precision topographic data and the low-precision topographic data to obtain fused topographic data; the first buffer surface data set is obtained by performing first buffer processing on the high-precision surface data set based on a first buffer value and the resolution of the high-precision topographic data; the first buffer value is determined according to the number of preset pixel values.
2. The method of claim 1, wherein the obtaining the corresponding inner ring point and outer ring point from the high precision terrain data and the low precision terrain data comprises:
acquiring corresponding inner ring points according to the high-precision topographic data;
and acquiring corresponding outer ring points according to the high-precision topographic data and the low-precision topographic data.
3. The method according to claim 2, wherein the obtaining the corresponding inner ring point according to the high-precision terrain data comprises:
combining the plurality of high-precision surface data to obtain a combined high-precision surface data set; the high-precision surface data are obtained by converting high-precision topographic data with the same elevation value; the high-precision topographic data with the same elevation value is obtained by algebraic operation of the high-precision topographic data;
acquiring a high-precision line data set corresponding to the high-precision surface data set;
according to the resolution ratio of the high-precision topographic data, carrying out buffer processing on the high-precision line data set to obtain a buffer surface data set; the buffer surface data set is consistent with the high-precision topographic data in size;
cutting the high-precision topographic data according to the buffer surface data set to obtain outer raster data formed by outer points corresponding to the high-precision topographic data;
And converting the data type of the outer raster data into point data to obtain the inner ring point.
4. A method according to claim 3, wherein said obtaining corresponding outer ring points from said high precision terrain data and said low precision terrain data comprises:
acquiring an edge surface data set with preset width along the edge of the high-precision surface data set; the edge surface data set is obtained by performing repeated buffering on the high-precision surface data set according to the preset pixel value and then cutting the high-precision surface data set subjected to repeated buffering;
acquiring empty raster data corresponding to the shape of the high-precision topographic data in the edge surface dataset;
updating the empty raster data according to the low-precision topographic data to obtain raster data of edge data comprising the low-precision topographic data;
and converting the raster data of the edge data comprising the low-precision topographic data into point data to obtain the outer ring point.
5. The method of claim 4, wherein the acquiring an edge surface dataset of a predetermined width along an edge of the high precision surface dataset comprises:
according to the first buffer value and the resolution ratio of the high-precision topographic data, performing first buffer processing on the high-precision surface data set to obtain a first buffer surface data set;
Performing second buffer processing on the high-precision surface data set according to a second buffer value and the resolution of the high-precision topographic data to obtain a second buffer surface data set;
cutting the first buffer surface data set according to the second buffer surface data set to obtain the edge surface data set;
the second buffer value is determined according to the number of the preset pixel values, and the first buffer value is larger than the second buffer value.
6. The method according to claim 1, wherein the obtaining the terrain data to be interpolated from the inner ring point and the outer ring point comprises:
and merging the data corresponding to the inner ring points and the data corresponding to the outer ring points to obtain the topographic data to be interpolated.
7. A terrain data fusion device, the device comprising:
the first acquisition module is used for acquiring high-precision topographic data to be fused and low-precision topographic data to be fused;
the second acquisition module is used for acquiring corresponding inner ring points and outer ring points according to the high-precision topographic data and the low-precision topographic data; the inner ring point is an outer side point of the high-precision topographic data; the outer ring points are points corresponding to the low-precision topographic data after the outer side points are expanded by preset pixel values;
The third acquisition module is used for acquiring the topographic data to be interpolated according to the inner ring point and the outer ring point;
the fusion module is used for carrying out interpolation processing on the topographic data to be interpolated according to the high-precision topographic data, obtaining topographic data obtained by fusing the high-precision topographic data and the low-precision topographic data based on the topographic data after the interpolation processing, and is specifically used for: determining interpolation data according to the resolution and pixel format corresponding to the high-precision topographic data and the elevation value corresponding to each high-precision topographic data; determining an interpolation range according to the distance between the inner ring point and the outer ring point in the topographic data to be interpolated; according to the interpolation data, carrying out interpolation processing on the topographic data to be interpolated in the interpolation range to obtain interpolation topographic data; updating the interpolation topographic data cut by the first buffer surface data set according to the high-precision topographic data to obtain updated interpolation topographic data; according to the updated interpolation topographic data, fusing the high-precision topographic data and the low-precision topographic data to obtain fused topographic data; the first buffer surface data set is obtained by performing first buffer processing on the high-precision surface data set based on a first buffer value and the resolution of the high-precision topographic data; the first buffer value is determined according to the number of preset pixel values.
8. The apparatus of claim 7, wherein the second acquisition module is specifically configured to:
acquiring corresponding inner ring points according to the high-precision topographic data;
and acquiring corresponding outer ring points according to the high-precision topographic data and the low-precision topographic data.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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