CN117591612B - Method, device and system for loading terrain tile data on three-dimensional platform in real time - Google Patents
Method, device and system for loading terrain tile data on three-dimensional platform in real time Download PDFInfo
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Abstract
The invention relates to the technical field of three-dimensional GIS (geographic information system), in particular to a method, a device and a system for loading terrain tile data on a three-dimensional platform in real time. The method for loading the topographic tile data in real time by the three-dimensional platform comprises the following steps: responding to a request for loading topographic tile data to a three-dimensional platform, and judging whether the tile data currently requested to be loaded is in the range of the area to be fused; if not, requesting to load the parent tile data to the three-dimensional platform; if yes, the following steps are executed: acquiring parent tile data and child tile data which are requested to be loaded; calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data; and requesting to load the fused target tile data to the three-dimensional platform. The invention can load different types of multi-part terrain tile data to the three-dimensional platform in real time.
Description
Technical Field
The invention relates to the technical field of three-dimensional GIS (geographic information system), in particular to a method, a device and a system for loading terrain tile data on a three-dimensional platform in real time.
Background
There are a variety of three-dimensional platforms that can create world-level 3D geospatial visualizations on web pages. The three-dimensional platforms can load various types of two-dimensional and three-dimensional data including terrain data services according to the requirements, and render the loaded data to be visually displayed in a 3D geographic space, so that the platforms can be widely applied to various types of two-dimensional and three-dimensional visual applications. However, these three-dimensional platforms only support loading a single topographic map layer, and the single topography often cannot meet the requirements of actual scenes, so that visual display of the scenes is not realistic enough.
Although it is also proposed to use desktop-side data processing software to fuse local terrain with global terrain during data processing, there is still a misalignment of the resulting terrain tiles from the data processing aspect on the boundaries of the local tiles and global tiles. And because the scheme is dependent on data processing and pre-stored data range configuration files, the scheme is limited in the actual use process, and the terrain data can only be processed by own data processing software and released into specific terrain data service to realize the function of multi-terrain fusion loading. In addition, due to the limitation of the ellipsoidal terrain grid and the calculation rule of the row and column numbers of the single tile, tiles of different levels can be loaded from near to far in the same view angle range, so that tiles of two levels on the boundary range can be fused incompletely.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method, an apparatus, and a system for loading topographic tile data in real time by using a three-dimensional platform, which are used for solving the technical problem that in the prior art, a three-dimensional platform cannot load multiple topographic tile data in real time.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for loading terrain tile data in real time by a three-dimensional platform, comprising the steps of:
responding to a request for loading topographic tile data to a three-dimensional platform, and judging whether the tile data currently requested to be loaded is in the range of the area to be fused;
if not, requesting to load the parent tile data to the three-dimensional platform;
if yes, the following steps are executed:
acquiring parent tile data and child tile data which are requested to be loaded;
calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
and requesting to load the fused target tile data to the three-dimensional platform.
Preferably, the asynchronous processing process is adopted to perform tile data fusion processing in the process of calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into one target tile data.
Preferably, the tile data fusion algorithm is executed by using WebAssembly technology in the process that the calling tile data fusion algorithm fuses the parent tile data requested to be loaded and the child tile data requested to be loaded into one target tile data.
Preferably, the step of calling the tile data fusion algorithm to fuse the parent tile data requested to be loaded and the child tile data requested to be loaded into a piece of target tile data further comprises the steps of:
respectively decomposing parent tile data and child tile data to obtain triangle patch metadata with vertex indexes;
acquiring a range of a fusion area corresponding to each sub-tile data as a sub-fusion area range;
determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each child fusion area, the decomposed father tile data and the decomposed child tile data;
calculating first data and second data for rendering in the triangle patch metadata needing to be fused according to the range of each sub-fusion area and the triangle patch metadata needing to be fused;
eliminating the elevation difference of the first data and the second data for rendering in the triangle patch metadata needing fusion processing at the boundary of the range of the sub-fusion area;
And synthesizing the first data, the second data and the triangle patch metadata which do not need fusion processing after the elevation difference is eliminated into target tile data.
Preferably, the obtaining the range of the fusion area corresponding to each sub-tile data as the sub-fusion area range further includes the following steps:
acquiring the range of a region to be fused;
acquiring data of each sub-tile;
and intersecting the data of each sub-tile with the range of the region to be fused to obtain the range of the sub-fusion region corresponding to each sub-tile.
Preferably, the determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each sub-fusion area, the decomposed parent tile data and the decomposed sub-tile data further comprises the following steps:
obtaining boundaries of all the sub-fusion area ranges according to all the sub-fusion area ranges;
acquiring triangle patch metadata positioned on each boundary in the parent tile data as first triangle patch metadata and triangle patch metadata positioned outside each boundary in the parent tile data as second triangle patch metadata after intersecting the boundaries of the decomposed parent tile data and each child fusion area range;
And intersecting each decomposed sub-tile data with the boundary of the corresponding sub-fusion area range to obtain triangle patch metadata positioned on the corresponding boundary of the sub-tile data as third triangle patch metadata and triangle patch metadata positioned in each boundary of the sub-tile data as fourth triangle patch metadata.
Preferably, the calculating the first data and the second data for rendering in the triangle patch metadata needing to be fused according to the range of the sub-fused region and the triangle patch metadata needing to be fused further includes the following steps:
intersecting the first triangle patch metadata with the range of the sub-fusion area, and reserving a difference set obtained after intersecting as first data for rendering;
and intersecting the third triangle patch metadata with the range of the sub-fusion area, and reserving an intersection obtained after intersecting as second data for rendering.
Preferably, the step of eliminating the difference in elevation between the first data and the second data for rendering in the triangle patch metadata to be fused at the boundary of the range of the sub-fusion area further comprises the following steps;
obtaining vertexes positioned at boundaries of the corresponding sub-fusion area ranges in the first data as vertexes to be projected;
Projecting the vertex to be projected onto a triangle patch corresponding to the second data to obtain a projection point;
replacing the height of the vertex of the corresponding boundary in the first data with the height of the projection point;
the method for synthesizing the target tile data by the first data, the second data and the triangle patch metadata without fusion processing after the altitude difference is eliminated further comprises the following steps:
screening out the second triangle patch metadata, the fourth triangle patch metadata and the polygon patch metadata and the triangle patch metadata in the first data and the second data after the elevation difference is eliminated;
simplifying the selected polygonal piece metadata into triangular piece metadata;
and synthesizing the simplified triangle patch metadata and the screened triangle patch metadata into target tile data.
In a second aspect, the present invention further provides an apparatus for loading terrain tile data on a three-dimensional platform in real time, the apparatus comprising:
the tile data range judging module is used for responding to a request for loading the topographic tile data to the three-dimensional platform and judging whether the tile data currently requested to be loaded are in the range of the area to be fused or not;
the fusion area outside tile data loading module is used for requesting to load parent tile data to the three-dimensional platform if the tile data are not in the range of the area to be fused;
The tile data loading module in the fusion area is used for executing the following steps if the tile data is in the range of the area to be fused:
acquiring parent tile data and child tile data which are requested to be loaded;
calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
and requesting to load the fused target tile data to the three-dimensional platform.
In a third aspect, the present invention also provides a system for loading terrain tile data in real time on a three-dimensional platform, the system comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method as described in the first aspect.
The beneficial effects are that: the method, the device and the system for loading the topographic tile data in real time for the three-dimensional platform firstly judge whether the loaded tile data is in the range of the area to be fused when the loading of the topographic tile data is requested to the three-dimensional platform, directly load the tile data which is not in the range of the area to be fused, and automatically call a data fusion algorithm to fuse a plurality of topographic tile data into one topographic tile data for loading when the requested loading data is in the range of the area to be fused, thereby realizing the compatible loading of a plurality of topographic tile data of different types into the three-dimensional platform which does not support the loading of the topographic tile data originally. The method and the device can automatically call the corresponding data fusion algorithm in the process of loading the three-dimensional front-end data, so that the real-time loading of the data of the multiple terrain tiles on the three-dimensional front end can be realized. And because the invention can firstly call the fusion algorithm to fuse the topographic tile data with different precision when loading a plurality of topographic tile data to the three-dimensional platform, the invention can compatibly load the topographic tile data with different precision to the three-dimensional platform, and the situation that the topographic tile data with different precision cannot be completely fused due to different precision can not be caused.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described, and it is within the scope of the present invention to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for loading terrain tile data in real time by a three-dimensional platform of the present invention;
FIG. 2 is a flow chart of a method of fusing a plurality of terrain tile data according to the present invention;
FIG. 3 is a flow chart of a method for obtaining a range of sub-fusion areas according to the present invention;
FIG. 4 is a flow chart of a method for obtaining triangle patch metadata to be fused according to the present invention;
FIG. 5 is a flow chart of a method for fusing triangle patch metadata to preserve data for rendering according to the present invention;
FIG. 6 is a flow chart of a method for eliminating elevation difference processing of fused data according to the present invention;
FIG. 7 is a diagram of a sub-fusion region before intersection with triangle patch metadata;
FIG. 8 is a diagram of a sub-fusion area using the range boundaries to intersect triangle patch metadata;
FIG. 9 is a schematic diagram of a vertex projected onto a triangle patch of a corresponding sub-tile at a boundary;
FIG. 10 is a flow chart of a method for synthesizing target tile data from respective data according to the present invention;
FIG. 11 is a detailed flow chart of the fusion process of multiple tile data according to the present invention;
FIG. 12 is a schematic diagram of the fusion of parent tile data and child tile data in accordance with the present invention;
FIG. 13 is an apparatus for loading terrain tile data in real time for a three-dimensional platform of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element. If not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other, which are all within the protection scope of the present invention.
Example 1
As shown in fig. 1, the embodiment provides a method for loading topographic tile data in real time by a three-dimensional platform, which includes the following steps:
s1: responding to a request for loading topographic tile data to a three-dimensional platform, and judging whether the tile data currently requested to be loaded is in the range of the area to be fused;
the topographic tile data refers to topographic slice data of a discrete pyramid structure conforming to the TMS rule. Terrain slice data is generated primarily from Digital Elevation Model (DEM) data by a data slicing tool.
The above-mentioned topography tile data that request loading may be one or more, and is not limited herein. When the loaded topographic tile data is multiple, each topographic tile data can be in different formats, different accuracies and different types of topographic tile data, so long as the TMS rule is satisfied.
When a request for loading topographic tile data to a three-dimensional platform is received, the embodiment firstly automatically judges whether the tile data currently requested to be loaded is in the range of the area to be fused or not, and specifically comprises the following steps:
acquiring a data range of the terrain tile data requested to be loaded;
because the line number corresponding to the range of the part of the topographic data is stored in the quantized grid (quantized-mesh) topographic tile, the line number of the part of the topographic data can be converted into the data range of the part of the topographic data through a certain conversion algorithm in the step.
Acquiring the range of a region to be fused;
in the implementation, a buffer zone is generated around the boundary based on the boundary of each topographic tile data to be loaded, and then the range of the minimum rectangle surrounding the range of the buffer zone is used as the range of the area to be fused.
And comparing the position of the topographic tile data requested to be loaded with the range of the area to be fused, and judging whether the topographic tile data requested to be loaded is positioned in the range of the area to be fused.
S2: if not, requesting to load the parent tile data to the three-dimensional platform;
if the requested loading of the terrain tile data is outside the range of the area to be fused, loading of parent tile data, which may be base terrain tile data of relatively low accuracy, may be requested directly from the three-dimensional platform.
S3: if yes, the following steps are executed:
s31: acquiring parent tile data and child tile data which are requested to be loaded;
when the step judges that the topographic tile data requested to be loaded is in the range of the area to be fused, the system is automatically requested to distribute the father tile data and the son tile data, and preparation is made for fusion of the topographic tile data. Wherein the sub-tile data may be fine terrain tile data of relatively high accuracy. The above-mentioned sub-tile data may be a single sub-tile data or a plurality of sub-tile data, and the number is not limited here.
S32: calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
when the terrain tile data requested to be loaded is judged to be in the range of the area to be fused, the embodiment automatically calls a fusion algorithm prepared in advance to perform data fusion processing on the terrain tile data requested to be loaded. The terrain tile data obtained after fusion is also referred to herein as target tile data for ease of description.
S33: and requesting to load the fused target tile data to the three-dimensional platform.
Because the terrain tile data are fused into one part of terrain tile data after fusion processing, the fused tile data can be requested to be loaded by a direct line three-dimensional platform.
As an alternative but advantageous embodiment, the present example is described in S32: and calling a tile data fusion algorithm to fuse the parent tile data requested to be loaded and the child tile data requested to be loaded into a target tile data, and executing tile data fusion processing by adopting an asynchronous processing process.
The method can put the process of data fusion processing into an asynchronous process for processing in an asynchronous mode, and avoids the influence of a large amount of computation of the fusion processing on the rendering performance of the three-dimensional platform. The method for asynchronously processing the data fusion can adopt the Webworkbench technology.
As an alternative but advantageous embodiment, the present example is described in S32: and calling a tile data fusion algorithm to fuse the parent tile data requested to be loaded and the child tile data requested to be loaded into a target tile data, and executing the tile data fusion algorithm by adopting a WebAssemble technology. In the process, the WebAssemble technology is adopted to mainly improve the terrain fusion executing efficiency and improve the performance of the whole fusion process.
WebAssembly (also known as wasm) is an efficient, low-level programming language. It allows the user to write the program in a language other than JavaScript (e.g., C, c++, rust, or others) and then compile it into WebAssembly, thereby creating a Web application that is very fast to load and execute. Wasm has the characteristics of high operation efficiency, safe memory, no undefined behavior, independent platform and the like, so that the process of data fusion in the front end can be furthest improved. The present embodiment, when embodied, saves the fusion algorithm as WebAssembly (wasm) format:
in the embodiment, the fusion process in the data processing stage is put into the front-end real-time loading process, when the tile data on the boundary range needs to be loaded in the three-dimensional scene, the terrain automatic fusion operation is immediately triggered, the tile data fusion algorithm stored by WebAssembly (wasm) technology is called, and finally the fusion process is put into the asynchronous process by means of webworkbench, so that the fusion data is loaded in the three-dimensional scene in real time. The method can adapt and be compatible with various terrain slices generated by TMS rules, is not limited by basic terrain data, and truly realizes multi-terrain fusion operation in a three-dimensional scene.
As an alternative but advantageous embodiment, as shown in fig. 2, S32 is described in this example: invoking a tile data fusion algorithm to fuse parent tile data requesting loading and child tile data requesting loading into a set of target tile data further comprises the steps of:
s321: respectively decomposing parent tile data and child tile data to obtain triangle patch metadata with vertex indexes;
this step parses the parent tile data and the child tile data. Since the parent tile data and the child tile data are typically polygons of larger size, the present embodiment breaks the parent tile 10 into small triangles and also breaks the child tile 20 into small triangles, with the data represented by each triangle also referred to herein as triangle patch metadata. In this embodiment, a number is uniformly allocated to each vertex of the triangle, and this number is the index of the triangle patch metadata.
S322: acquiring a range of a fusion area corresponding to each sub-tile data as a sub-fusion area range;
the range of the fusion area corresponding to the sub-tile data refers to the range of the fusion area only related to the sub-tile in the fusion process.
As an alternative but advantageous embodiment, as shown in fig. 3, S322 is described in this example: the obtaining the range of the fusion area corresponding to each sub-tile data as the range of the sub-fusion area further comprises the following steps:
s3221: acquiring the range of a region to be fused;
s3222: acquiring the range of each sub-tile data;
s3223: and intersecting the range of the data of each sub-tile with the range of the region to be fused to obtain the range of the sub-fusion region corresponding to each sub-tile. The intersection of the range of the sub-tile data and the range of the area to be fused refers to the calculation of the range occupied by the sub-tile data in the area to be fused.
Because the fusion area generally covers all the sub-tile data, the method extracts the range of the fusion area corresponding to each sub-tile data, so that the speed of the subsequent fusion processing can be improved. When there are a plurality of sub-tile data, there are a plurality of sub-fusion area ranges, and there is a one-to-one correspondence with the sub-tile data.
S323: determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each child fusion area, the decomposed father tile data and the decomposed child tile data;
In this step, all triangle patch metadata is divided into two major parts, namely triangle patch metadata requiring fusion processing and triangle patch metadata not requiring fusion processing, as shown in fig. 4, and the method comprises the following steps in the specific implementation:
s3231: obtaining boundaries of all the sub-fusion area ranges according to all the sub-fusion area ranges;
wherein the boundary of the range of the sub-fusion area refers to the outer contour of the sub-fusion area. As shown in the first column of fig. 12, the range of the sub-fusion area is generally an area surrounded by polygons, and the boundary of the range of the sub-fusion area is a polygon surrounding the area.
S3232: intersecting the decomposed parent tile data with the boundaries of all the child fusion area ranges to obtain triangle patch metadata positioned on all the boundaries in the parent tile data as first triangle patch metadata and triangle patch metadata positioned outside all the boundaries in the parent tile data as second triangle patch metadata;
the method comprises the steps of intersecting triangle patch metadata obtained by decomposing parent tile data with the boundaries of all sub-fusion area ranges, namely, intersecting triangle patch metadata with the boundaries of the sub-fusion area ranges in the triangle patch metadata obtained by decomposing the parent tile data are used as first triangle patch metadata, and the remaining triangle patch metadata without intersecting points with the boundaries of the sub-fusion area ranges are used as second triangle patch metadata. The first triangle patch metadata belongs to triangle patch metadata which is required to be fused subsequently, and the second triangle patch metadata belongs to triangle patch metadata which is not required to be fused subsequently.
S3233: and intersecting each decomposed sub-tile data with the boundary of the corresponding sub-fusion area range to obtain triangle patch metadata positioned on the corresponding boundary of the sub-tile data as third triangle patch metadata and triangle patch metadata positioned in each boundary of the sub-tile data as fourth triangle patch metadata.
The triangle patch metadata obtained by decomposing the sub-tile data and the boundaries of the sub-fusion area ranges are intersected, namely triangle patch metadata with intersection points with the boundaries of the sub-fusion area ranges in the triangle patch metadata obtained by decomposing the sub-tile data are obtained to serve as third triangle patch metadata, and the remaining triangle patch metadata without intersection points with the boundaries of the sub-fusion area ranges are used as fourth triangle patch metadata. The third triangle patch metadata belongs to triangle patch metadata which is needed to be fused subsequently, and the fourth triangle patch metadata belongs to triangle patch metadata which is not needed to be fused subsequently.
S324: calculating first data and second data for rendering in the triangle patch metadata needing to be fused according to the range of each sub-fusion area and the triangle patch metadata needing to be fused;
As shown in the sub-graphs in the second column and the third column in fig. 12, the present step performs fusion processing on triangle patch metadata to be fused, and removes some partial data of the triangle patch metadata in the fusion process, and leaves the data to be finally loaded into the three-dimensional platform for rendering, as shown in fig. 5, and the specific implementation includes the following steps:
s3241: intersecting the first triangle patch metadata with the range of the sub-fusion area, and reserving a difference set obtained after intersecting as first data for rendering;
the step of intersecting the data to be fused in the parent tile with the range of the sub-fusion area refers to finding out the part of the first triangle patch metadata which is intersected with the range of the sub-fusion area and removing the part, and reserving the intersection difference, namely the part which is remained to be intersected with the range of the sub-fusion area, as the first data, wherein the first data is loaded into a three-dimensional platform for rendering.
S3242: and intersecting the third triangle patch metadata with the range of the sub-fusion area, and reserving an intersection obtained after intersecting as second data for rendering.
The step of intersecting the data to be fused in the sub-tile with the range of the sub-fusion area refers to finding out the part of the first triangle patch metadata which is intersected with the range of the sub-fusion area and keeping the part as the second data, wherein the second data is loaded into a three-dimensional platform for rendering.
S325: eliminating the elevation difference of the first data and the second data for rendering in the triangle patch metadata needing fusion processing at the boundary of the range of the sub-fusion area;
the method for eliminating the elevation difference caused by intersection of the range of the quilt fusion area in the process of fusing tiles further improves the precision of the tiles with different precision levels, and specifically, the method for eliminating the elevation difference comprises the following steps:
s3251: obtaining vertexes of the boundary in the range of the corresponding sub-fusion area in the first data as vertexes to be projected;
wherein the first data is the portion of the triangle patch metadata of the parent tile that was left after the parent tile was trimmed by the child blend area range in the previous step. For example, the triangle of the parent tile 1 after being cut in fig. 7 and 8 has two intersecting points with the corresponding boundary, and the two intersecting points are the vertices of the first data on the boundary only, that is, the points a and b in fig. 7 and 8, and the two points can be regarded as the vertices to be projected in this step.
S3252: projecting the vertex to be projected onto a triangle patch corresponding to the second data to obtain a projection point;
for example, in fig. 9, point a falls on triangle element a of the sub-tile 20, and point B falls on triangle element B of the sub-tile 20, so that this step projects point a into triangle element a to obtain a projection point, where the height of the projection point at the location of triangle element a is the height of the projection point. In the step, the point B is projected into the triangle patch B to obtain a projection point, and the height of the projection point at the position of the triangle patch B is the height of the projection point.
S3253: replacing the height of the vertex of the corresponding boundary in the first data with the height of the projection point;
for example, this step may replace the height of vertex B with the height of the projection point at the location of triangle patch B, and may replace the height of vertex a with the height of the projection point at the location of triangle patch a.
S326: and synthesizing the first data, the second data and the triangle patch metadata which do not need fusion processing after the elevation difference is eliminated into target tile data.
As shown in fig. 12, the data obtained after the fusion processing and triangle patch metadata without the fusion processing are synthesized in this step and finally used for loading the target tile data into the three-dimensional platform for rendering. As shown in fig. 10, the specific synthesis method includes the following steps:
s3261: screening out the second triangle patch metadata, the fourth triangle patch metadata and the polygon patch metadata and the triangle patch metadata in the first data and the second data after the elevation difference is eliminated;
s3262: simplifying the selected polygonal piece metadata into triangular piece metadata;
in the data fusion process, a plurality of polygonal fragments may be generated, and in this embodiment, polygonal data in the rendered data is screened out and decomposed. The polygonal simplification of this embodiment may employ an ear-cut method.
S3263: and synthesizing the simplified triangle patch metadata and the screened triangle patch metadata into target tile data.
After the previous simplification, all the data for rendering loaded into the three-dimensional platform is in the form of triangle patch metadata, which is all synthesized together into one piece of target tile data. As shown in fig. 12, the triangle patch metadata synthesized by the last user mainly consists of three parts, one part is data which belongs to the parent tile and does not need fusion processing, and the other part is data which belongs to each sub-tile and does not need fusion processing. The above is a detailed description of the algorithm for fusing multiple tile data in this embodiment, and the corresponding detailed flow may be seen in fig. 11. In addition, the method adopted for intersection in the embodiment is Weiler-Athereton polygon cutting algorithm.
Example 2
As shown in fig. 13, the embodiment further provides an apparatus for loading terrain tile data on a three-dimensional platform in real time, where the apparatus includes:
the tile data range judging module is used for responding to a request for loading the topographic tile data to the three-dimensional platform and judging whether the tile data currently requested to be loaded are in the range of the area to be fused or not;
The fusion area outside tile data loading module is used for requesting to load parent tile data to the three-dimensional platform if the tile data are not in the range of the area to be fused;
the tile data loading module in the fusion area is used for executing the following steps if the tile data is in the range of the area to be fused:
acquiring parent tile data and child tile data which are requested to be loaded;
calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
and requesting to load the fused target tile data to the three-dimensional platform.
The tile data loading module in the fusion area further comprises:
the tile data analysis submodule is used for respectively decomposing the father tile data and the child tile data to obtain triangle patch metadata with vertex indexes;
the sub-fusion area range extraction sub-module is used for obtaining the range of the fusion area corresponding to each sub-tile data as a sub-fusion area range;
The fusion data determining submodule is used for determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each sub-fusion area, the decomposed father tile data and the decomposed sub-tile data;
the data fusion processing sub-module is used for calculating first data and second data which are used for rendering in triangle patch metadata which need to be fused according to the range of each sub-fusion area and the triangle patch metadata which need to be fused;
the elevation difference eliminating submodule is used for eliminating the elevation difference of the first data and the second data which are used for rendering in the triangle patch metadata which need to be fused and processed at the boundary of the range of the sub-fusion area;
and the data synthesis submodule is used for synthesizing the first data and the second data after the elevation difference is eliminated and triangle patch metadata which do not need fusion processing into target tile data.
Example 3
The embodiment provides a system for loading topographic tile data in real time by a three-dimensional platform, which comprises: at least one processor, at least one memory, and computer program instructions stored in the memory that, when executed by the processor, implement the method described in embodiment 1.
In particular, the processor may be a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present invention.
The memory may include mass storage for data or instructions. By way of example, and not limitation, the memory may comprise a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. The memory may include removable or non-removable (or fixed) media, where appropriate. The memory may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory is a non-volatile solid state memory. In a particular embodiment, the memory includes Read Only Memory (ROM). The ROM may be mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these, where appropriate.
The processor implements any of the data addressing methods of the above embodiments by reading and executing computer program instructions stored in memory.
The display screen of the present embodiment may also include a communication interface and bus in one example. The control circuit, the memory and the communication interface are connected through a bus and complete communication with each other.
The communication interface is mainly used for realizing communication among the modules, the devices, the units and/or the equipment in the embodiment of the invention.
The bus includes hardware, software, or both that couple the various components for the display screen to one another. By way of example, and not limitation, the buses may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a micro channel architecture (MCa) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of the above. Bus 0 may include one or more buses, where appropriate. Although embodiments of the invention have been described and illustrated with respect to a particular bus, the invention contemplates any suitable bus or interconnect. The control circuit includes at least one processor, at least one memory, and computer program instructions stored in the memory that when executed by the processor implement the method of the display method of embodiment 2.
Example 4
In addition, in combination with the method for loading the topographic tile data in real time by the three-dimensional platform in the embodiment, the embodiment of the invention can be realized by providing a computer readable storage medium. The computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a method for loading terrain tile data in real time by any of the three-dimensional platforms of the above embodiments.
The above is a detailed description of the method and system for loading the terrain tile data in real time by the three-dimensional platform provided by the embodiment of the invention.
It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this disclosure describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.
In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.
Claims (9)
1. The method for loading the topographic tile data by the three-dimensional platform in real time is characterized by comprising the following steps of:
responding to a request for loading topographic tile data to a three-dimensional platform, and judging whether the tile data currently requested to be loaded is in the range of the area to be fused;
If not, requesting to load the parent tile data to the three-dimensional platform;
if yes, the following steps are executed:
acquiring parent tile data and child tile data which are requested to be loaded;
calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
requesting to load the fused target tile data to the three-dimensional platform;
the responding to the request for loading the topographic tile data to the three-dimensional platform, and judging whether the tile data currently requested to be loaded is in the range of the area to be fused comprises the following steps:
acquiring a data range of the terrain tile data requested to be loaded;
acquiring the range of a region to be fused;
comparing the position of the topographic tile data requested to be loaded with the range of the area to be fused, and judging whether the topographic tile data requested to be loaded is positioned in the range of the area to be fused;
the obtaining the range of the region to be fused comprises the following steps:
acquiring boundaries of topographic tile data to be loaded;
generating a buffer zone around the boundary;
taking the range of the minimum rectangle which surrounds the range of the buffer zone as the range of the area to be fused;
the step of calling the tile data fusion algorithm to fuse the parent tile data requested to be loaded and the child tile data requested to be loaded into one target tile data further comprises the following steps:
Respectively decomposing parent tile data and child tile data to obtain triangle patch metadata with vertex indexes;
acquiring a range of a fusion area corresponding to each sub-tile data as a sub-fusion area range;
determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each child fusion area, the decomposed father tile data and the decomposed child tile data;
calculating first data and second data for rendering in the triangle patch metadata needing to be fused according to the range of each sub-fusion area and the triangle patch metadata needing to be fused;
eliminating the elevation difference of the first data and the second data for rendering in the triangle patch metadata needing fusion processing at the boundary of the range of the sub-fusion area;
and synthesizing the first data, the second data and the triangle patch metadata which do not need fusion processing after the elevation difference is eliminated into target tile data.
2. The method for loading topographic tile data in real time by a three-dimensional platform according to claim 1, wherein the step of calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a set of target tile data uses an asynchronous processing process to perform tile data fusion processing.
3. The method for loading topographic tile data on a three-dimensional platform in real time according to claim 1, wherein the tile data fusion algorithm is performed by using WebAssembly technique in the step of invoking the tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a piece of target tile data.
4. The method for loading topographic tile data on a three-dimensional platform in real time according to claim 1, wherein the obtaining the range of the fusion area corresponding to each sub-tile data as the sub-fusion area range further comprises the steps of:
acquiring the range of a region to be fused;
acquiring the range of each sub-tile data;
and intersecting the range of the data of each sub-tile with the range of the region to be fused to obtain the range of the sub-fusion region corresponding to each sub-tile.
5. The method for loading topographic tile data in real time by a three-dimensional platform according to claim 4, wherein the determining triangle patch metadata requiring fusion processing and triangle patch metadata not requiring fusion processing according to the respective sub-fusion area range, the decomposed parent tile data and the decomposed sub-tile data further comprises the steps of:
Obtaining boundaries of all the sub-fusion area ranges according to all the sub-fusion area ranges;
acquiring triangle patch metadata positioned on each boundary in the parent tile data as first triangle patch metadata and triangle patch metadata positioned outside each boundary in the parent tile data as second triangle patch metadata after intersecting the boundaries of the decomposed parent tile data and each child fusion area range;
and intersecting each decomposed sub-tile data with the boundary of the corresponding sub-fusion area range to obtain triangle patch metadata positioned on the corresponding boundary of the sub-tile data as third triangle patch metadata and triangle patch metadata positioned in each boundary of the sub-tile data as fourth triangle patch metadata.
6. The method for loading topographic tile data on a three-dimensional platform according to claim 5, wherein the calculating the first data and the second data for rendering in the triangle patch metadata to be fused according to the range of the sub-fused regions and the triangle patch metadata to be fused further comprises the following steps:
intersecting the first triangle patch metadata with the range of the sub-fusion area, and reserving a difference set obtained after intersecting as first data for rendering;
And intersecting the third triangle patch metadata with the range of the sub-fusion area, and reserving an intersection obtained after intersecting as second data for rendering.
7. The method for loading topographic tile data on a three-dimensional platform in real time according to claim 6, wherein the eliminating the difference in elevation of the first data and the second data for rendering in the triangle patch metadata requiring the fusion process at the boundary of the range of the sub-fusion area further comprises the steps of;
obtaining vertexes positioned at boundaries of the corresponding sub-fusion area ranges in the first data as vertexes to be projected;
projecting the vertex to be projected onto a triangle patch corresponding to the second data to obtain a projection point;
replacing the height of the vertex of the corresponding boundary in the first data with the height of the projection point;
the method for synthesizing the target tile data by the first data, the second data and the triangle patch metadata without fusion processing after the altitude difference is eliminated further comprises the following steps:
screening out the second triangle patch metadata, the fourth triangle patch metadata and the polygon patch metadata and the triangle patch metadata in the first data and the second data after the elevation difference is eliminated;
simplifying the selected polygonal piece metadata into triangular piece metadata;
And synthesizing the simplified triangle patch metadata and the screened triangle patch metadata into target tile data.
8. A device for loading terrain tile data in real time by a three-dimensional platform, the device comprising:
the tile data range judging module is used for responding to a request for loading the topographic tile data to the three-dimensional platform and judging whether the tile data currently requested to be loaded are in the range of the area to be fused or not, and comprises the following steps:
acquiring a data range of the terrain tile data requested to be loaded;
acquiring the range of a region to be fused;
comparing the position of the topographic tile data requested to be loaded with the range of the area to be fused, and judging whether the topographic tile data requested to be loaded is positioned in the range of the area to be fused;
the obtaining the range of the region to be fused comprises the following steps:
acquiring boundaries of topographic tile data to be loaded;
generating a buffer zone around the boundary;
taking the range of the minimum rectangle which surrounds the range of the buffer zone as the range of the area to be fused;
the fusion area outside tile data loading module is used for requesting loading of parent tile data to the three-dimensional platform if the tile data is not in the range of the area to be fused
The tile data loading module in the fusion area is used for executing the following steps if the tile data is in the range of the area to be fused:
acquiring parent tile data and child tile data which are requested to be loaded;
calling a tile data fusion algorithm to fuse parent tile data requested to be loaded and child tile data requested to be loaded into a target tile data;
requesting to load the fused target tile data to the three-dimensional platform;
the step of calling the tile data fusion algorithm to fuse the parent tile data requested to be loaded and the child tile data requested to be loaded into one target tile data further comprises the following steps:
respectively decomposing parent tile data and child tile data to obtain triangle patch metadata with vertex indexes;
acquiring a range of a fusion area corresponding to each sub-tile data as a sub-fusion area range;
determining triangle patch metadata needing fusion processing and triangle patch metadata not needing fusion processing according to the range of each child fusion area, the decomposed father tile data and the decomposed child tile data;
calculating first data and second data for rendering in the triangle patch metadata needing to be fused according to the range of each sub-fusion area and the triangle patch metadata needing to be fused;
Eliminating the elevation difference of the first data and the second data for rendering in the triangle patch metadata needing fusion processing at the boundary of the range of the sub-fusion area;
and synthesizing the first data, the second data and the triangle patch metadata which do not need fusion processing after the elevation difference is eliminated into target tile data.
9. A system for loading terrain tile data in real-time on a three-dimensional platform, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method of any one of claims 1-7.
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