CN111986324A - Equivalent surface construction method based on meteorological elements - Google Patents
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Abstract
The invention relates to a meteorological element-based isosurface construction method, which comprises the following steps: step S1, spatial interpolation of scatter data; step S2, establishing a grade list; step S3, drawing a contour line; step S4, cutting the contour line; and step S5, splicing the isosurface. The isosurface generation method is sensitive to abnormal points, the problem that sites with data lack of reports and abnormal reports of the sites do not participate in analysis when each type of meteorological element has a set threshold value and the sites with data exceeding the threshold value range are considered, meanwhile, compared with the traditional isosurface analysis algorithm, the method takes 10-30 s of time when isosurface analysis is carried out on observation stations in the provincial range, the method does not take time from the beginning of query to the time when interface response does not exceed 1s under the same data condition, and the working efficiency of forecasters is greatly improved.
Description
Technical Field
The invention relates to the technical field of meteorological elements, in particular to a meteorological element-based isosurface construction method.
Background
Before the isosurface analysis technology appears, the forecast graph is mainly drawn manually, although forecast data from various channels can be referred in the drawing process, the subjectivity is strong, the results obtained by drawing the forecast graph in the same period by different people are quite different, the efficiency is low, sometimes a forecaster is required to completely wring out the brain juice in order to make a forecast graph, and the problem is well solved due to the isosurface analysis technology.
The isosurface analysis technology is a technical means for constructing a closed curved surface based on discrete points, the constructed surface can present different value ranges corresponding to different closed surfaces, and the surface areas are intersected and do not overlap with each other. And rendering the constructed isosurface through data of a GIS engine, and displaying a high-quality forecast graph. But also, because the spatial scale of the meteorological data is often large in span, the number of discrete points participating in the analysis is large, the distribution is not even, and even abnormal points may exist.
Based on the above situation, the disadvantages of the conventional isosurface analysis technology are reflected, for example, the analysis efficiency is relatively low in a large-scale space, the method is not sensitive to abnormal points, and the problem of large analysis result error when the discrete point distribution is extremely uneven is difficult to be considered.
Disclosure of Invention
The invention provides a meteorological element-based isosurface construction method, aiming at the defects of relatively low analysis efficiency under a large-scale space, insensitivity to abnormal points, difficulty in considering the problem of large analysis result error when discrete points are extremely unevenly distributed and the like in the existing isosurface analysis technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: the meteorological element-based isosurface construction method comprises the following steps:
step S1, spatial interpolation of scatter data: interpolating scattered point data containing longitude, latitude and element values into a regular grid to form grid data;
step S2, establishing a rank list: preprocessing the input grade parameters and establishing a grade list in a list form;
step S3, drawing the contour line, specifically including the following steps:
step S31: selecting a specific grade K according to the grade list, searching grid points one by one from the southwest corner to the north and then to the east in the grid, and when the value g (X) of one grid point is found to be larger than g (K) and the value g (X) of the adjacent grid point is smaller than g (K), determining a position in the middle of a connecting line of the two grid points as the starting point P0 of the contour line K through linear interpolation;
step S32: determining a quadrangle which comprises the P0 point and is composed of four grid points and connecting lines thereof, and finding a next point with the value equal to g (K) in the other 3 edges of the quadrangle except the edge where the P0 is located, and marking the next point as P1;
step S33: finding the next point P2 from P1 in the same way, and repeating the loop until the newly found point Pn is at the grid boundary, or back to P0, and recording the list of all points obtained in the process as a contour K0;
step S34: continuously searching isolines which have the grade of g (K) and are not scanned by the previous step from the unsearched grid areas, repeating the steps S31-S33, and finding out all other lines with the grade value of g (K);
step S35: changing the grade K, circulating the steps S31-S34, and searching out lines corresponding to all the grades;
step S4, contour clipping: cutting out an isoline in the region according to the cutting region information;
step S5, splicing isosurface: the method specifically comprises the following steps:
step S51: copying the contour line result and reversing the drawing point sequence of the line, thereby obtaining a positive set of contour lines and a negative set of contour lines;
step S52: the outer circle of 1 iso-surface is obtained.
In a preferred embodiment of the meteorological element-based isosurface construction method provided by the present invention, the interpolation method of step S1 includes the following steps:
step S11: for the ith and j grid points G (i, j) in the grid, finding out a station which is less than 200Km away from the ith and j grid points G (i, j);
step S12: selecting the latest 10 sites from the sites found in the step S11, and if the number of the sites is less than 10, all the sites are reserved;
step S13: adopting an inverse distance weight average method for the station in the step S12 as a value G (X) on the grid point G (i, j);
step S14: and repeating the step S11 to the step S14 to obtain the values of all the grid points.
In a preferred embodiment of the meteorological element-based isosurface construction method provided by the present invention, the preprocessing method of step S2 includes the following steps:
step S21: processing the parameters input in the form of a list or in the form of equal spacing into the form of a list;
step S22: and comparing the grade parameters preprocessed into the list with the interpolated grid data, and if the start-stop value of the grade list can not cover the value range of the grid data, adding a larger grade parameter at the head of the grade list or adding a smaller grade parameter at the tail of the grade list to ensure that the start-stop value of the new grade list covers the value range of the grid data. .
In a preferred embodiment of the meteorological element-based isosurface construction method provided by the present invention, in step S4, the contour clipping includes the following steps:
step S41: selecting 1 contour line, and calculating all intersection points between the contour line and boundary lines of all cutting areas;
step S42: cutting the contour line into a plurality of segments according to the intersection points of the step S41, wherein if no intersection point exists, the contour line is cut into 1 segment;
step S43: taking the 1-segment contour line in the step S42, judging whether the middle point of the contour line is positioned in the cutting area, if so, keeping, otherwise, deleting, circularly judging each segment contour line, and obtaining all the kept line segments;
step S44: and judging all line segments in the cutting area by adopting the methods of the steps S41-S43 for other contour lines.
In a preferred embodiment of the meteorological element-based isosurface construction method provided by the present invention, in step S52, the obtaining of the isosurface outer ring includes the following steps:
step S521: selecting 1 contour L1 from the clipped contours, and adding the contour L1 as the outer circle of one contour, wherein the method comprises the following conditions:
if it does not intersect the boundary, it will be treated as an iso-surface outer-ring;
if an intersection point p0 exists, finding a next intersection point p1 on the cutting boundary line from the intersection point, splicing the line segment C1 on the cutting boundary to the contour line of the outer circle, finding the contour line L2 with the p1 as the vertex, if the L2 and the L1 are the same line, terminating the process, otherwise splicing the line segment C1 to the outer circle, finding the next intersection point p3 on the boundary from the tail end point p2 of the L2, namely the intersection point of the L2 and the boundary, thereby obtaining another line segment C2 on the boundary, adding the line segment C2 to the outer circle, further finding the contour line L3 with the p3 as the starting point, judging whether the line segment L3 is consistent with the L0, if the line is consistent, terminating, otherwise, continuing to repeat the searching and splicing steps, and marking all contour lines used in the splicing step as adopted.
Step S522: considering that the joined isosurface may be an annular isosurface, it is further determined whether there is an inner ring (the outer ring and the inner ring correspond to the outer diameter and the inner diameter of the annular surface) in the outer ring obtained in step S521, and for the outer ring obtained in step S521, the inner ring is found from the contour lines that have not been adopted, and the condition that one contour line is the inner ring includes the following cases:
a, the equality line is a closed line;
b, the isoline is surrounded by the outer ring;
c, the contour is not enclosed by other contours inside the outer ring. .
Compared with the prior art, the meteorological element-based isosurface construction method has the beneficial effects that:
the isosurface generation method is sensitive to abnormal points, the problem that sites with data missing and abnormal reports of the sites take 10-30 s of time when isosurface analysis is carried out on observation stations in a provincial range is effectively solved by considering that each type of meteorological elements has a set threshold value, and the sites with data exceeding the threshold value range do not participate in analysis, and the working efficiency of a forecaster is greatly improved by the time from the beginning of query to the time when interface response does not exceed 1s under the same data condition compared with the time consumed by a traditional isosurface analysis algorithm when isosurface analysis is carried out on the observation stations in the provincial range;
the method supports the construction of the isosurface in the designated polygon area, can cut the designated polygon area on the basis of the rectangular isosurface constructed by the traditional isosurface calculation, can best present the isosurface obtained by cutting to a user interface, and improves the beautification degree of the graph.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of an isosurface construction based on meteorological elements provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the method for constructing an isosurface based on meteorological elements includes the following steps:
step S1, spatial interpolation of scatter data: interpolating scattered point data containing longitude, latitude and element values into a regular grid to form grid data; the interpolation method specifically comprises the following steps:
step S11: for the ith and j grid points G (i, j) in the grid, finding out a station which is less than 200Km away from the ith and j grid points G (i, j);
step S12: selecting the latest 10 sites from the sites found in the step S11, and if the number of the sites is less than 10, all the sites are reserved;
step S13: adopting an inverse distance weight average method for the station in the step S12 as a value G (X) on the grid point G (i, j);
step S14: and repeating the step S11 to the step S14 to obtain the values of all the grid points.
The method and the device adjust and optimize parameters of the reverse distance interpolation algorithm, compared with the common interpolation algorithm, the spatial distribution of interpolation results is more reasonable, the problem of concentric circles is avoided, and the algorithm module for acquiring the list of the sites near the grids during the reverse distance interpolation adopts a search algorithm with reverse influence, so that the interpolation efficiency is greatly improved.
Step S2, establishing a rank list: preprocessing the input grade parameters and establishing a grade list in a list form; the pretreatment method comprises the following steps:
step S21: processing the parameters input in the form of a list or in the form of equal spacing into the form of a list;
step S22: and comparing the grade parameters preprocessed into the list with the interpolated grid data, and if the start-stop value of the grade list can not cover the value range of the grid data, adding a larger grade parameter at the head of the grade list or adding a smaller grade parameter at the tail of the grade list to ensure that the start-stop value of the new grade list covers the value range of the grid data.
Step S3, drawing the contour line, specifically including the following steps:
step S31: selecting a specific grade K according to the grade list, searching grid points one by one from the southwest corner to the north and then to the east in the grid, and when the value g (X) of one grid point is found to be larger than g (K) and the value g (X) of the adjacent grid point is smaller than g (K), determining a position in the middle of a connecting line of the two grid points as the starting point P0 of the contour line K through linear interpolation;
step S32: determining a quadrangle which comprises the P0 point and is composed of four grid points and connecting lines thereof, and finding a next point with the value equal to g (K) in the other 3 edges of the quadrangle except the edge where the P0 is located, and marking the next point as P1;
step S33: finding the next point P2 from P1 in the same way, and repeating the loop until the newly found point Pn is at the grid boundary, or back to P0, and recording the list of all points obtained in the process as a contour K0;
step S34: continuously searching isolines which have the grade of g (K) and are not scanned by the previous step from the unsearched grid areas, repeating the steps S31-S33, and finding out all other lines with the grade value of g (K);
step S35: and changing the grade K, and circulating the steps S31-S34 to search out the lines corresponding to all the grades.
The contour line drawing method disclosed by the invention has the advantages that the contour line is drawn point by point one by searching in a mode of turning a rectangle, so that the searching range of the drawing point is greatly reduced, and the efficiency of contour line drawing is obviously improved.
Step S4, contour clipping: cutting out an isoline in the region according to the cutting region information; the method specifically comprises the following steps:
step S41: selecting 1 contour line, and calculating all intersection points between the contour line and boundary lines of all cutting areas;
step S42: cutting the contour line into a plurality of segments according to the intersection points of the step S41, wherein if no intersection point exists, the contour line is cut into 1 segment;
step S43: taking the 1-segment contour line in the step S42, judging whether the middle point of the contour line is positioned in the cutting area, if so, keeping, otherwise, deleting, circularly judging each segment contour line, and obtaining all the kept line segments;
step S44: and judging all line segments in the cutting area by adopting the methods of the steps S41-S43 for other contour lines.
Step S5, splicing isosurface: the method specifically comprises the following steps:
step S51: copying the contour line result and reversing the drawing point sequence of the line, thereby obtaining a positive set of contour lines and a negative set of contour lines;
step S52: the method for obtaining the outer ring with 1 isosurface specifically comprises the following steps:
step S521: selecting 1 contour L1 from the clipped contours, and adding the contour L1 as the outer circle of one contour, wherein the method comprises the following conditions:
if it does not intersect the boundary, it will be treated as an iso-surface outer-ring;
if an intersection point p0 exists, finding a next intersection point p1 on the cutting boundary line from the intersection point, splicing the line segment C1 on the cutting boundary to the contour line of the outer circle, finding the contour line L2 with the p1 as the vertex, if the L2 and the L1 are the same line, terminating the process, otherwise splicing the line segment C1 to the outer circle, finding the next intersection point p3 on the boundary from the tail end point p2 of the L2, namely the intersection point of the L2 and the boundary, thereby obtaining another line segment C2 on the boundary, adding the line segment C2 to the outer circle, further finding the contour line L3 with the p3 as the starting point, judging whether the line segment L3 is consistent with the L0, if the line is consistent, terminating, otherwise, continuing to repeat the searching and splicing steps, and marking all contour lines used in the splicing step as adopted.
Step S522: considering that the joined isosurface may be an annular isosurface, it is further determined whether there is an inner ring (the outer ring and the inner ring correspond to the outer diameter and the inner diameter of the annular surface) in the outer ring obtained in step S521, and for the outer ring obtained in step S521, the inner ring is found from the contour lines that have not been adopted, and the condition that one contour line is the inner ring includes the following cases:
a, the equality line is a closed line;
b, the isoline is surrounded by the outer ring;
c, the contour is not enclosed by other contours inside the outer ring.
The method supports the generation of the isosurface of the complex topological structure, and can still generate the isosurface rapidly and correctly under the condition that the cutting area is a plurality of communication areas or a hollow-out area exists.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A meteorological element-based isosurface construction method is characterized by comprising the following steps: the method comprises the following steps:
step S1, spatial interpolation of scatter data: interpolating scattered point data containing longitude, latitude and element values into a regular grid to form grid data;
step S2, establishing a rank list: preprocessing the input grade parameters and establishing a grade list in a list form;
step S3, drawing the contour line, specifically including the following steps:
step S31: selecting a specific grade K according to the grade list, searching grid points one by one from the southwest corner to the north and then to the east in the grid, and when the value g (X) of one grid point is found to be larger than g (K) and the value g (X) of the adjacent grid point is smaller than g (K), determining a position in the middle of a connecting line of the two grid points as the starting point P0 of the contour line K through linear interpolation;
step S32: determining a quadrangle which comprises the P0 point and is composed of four grid points and connecting lines thereof, and finding a next point with the value equal to g (K) in the other 3 edges of the quadrangle except the edge where the P0 is located, and marking the next point as P1;
step S33: finding the next point P2 from P1 in the same way, and repeating the loop until the newly found point Pn is at the grid boundary, or back to P0, and recording the list of all points obtained in the process as a contour K0;
step S34: continuously searching isolines which have the grade of g (K) and are not scanned by the previous step from the unsearched grid areas, repeating the steps S31-S33, and finding out all other lines with the grade value of g (K);
step S35: changing the grade K, circulating the steps S31-S34, and searching out lines corresponding to all the grades;
step S4, contour clipping: cutting out an isoline in the region according to the cutting region information;
step S5, splicing isosurface: the method specifically comprises the following steps:
step S51: copying the contour line result and reversing the drawing point sequence of the line, thereby obtaining a positive set of contour lines and a negative set of contour lines;
step S52: the outer circle of 1 iso-surface is obtained.
2. The meteorological element-based isosurface construction method according to claim 1, wherein: the interpolation method of step S1 includes the steps of:
step S11: for the ith and j grid points G (i, j) in the grid, finding out a station which is less than 200Km away from the ith and j grid points G (i, j);
step S12: selecting the latest 10 sites from the sites found in the step S11, and if the number of the sites is less than 10, all the sites are reserved;
step S13: adopting an inverse distance weight average method for the station in the step S12 as a value G (X) on the grid point G (i, j);
step S14: and repeating the step S11 to the step S14 to obtain the values of all the grid points.
3. The meteorological element-based isosurface construction method according to claim 1, wherein: the preprocessing method of step S2 includes the steps of:
step S21: processing the parameters input in the form of a list or in the form of equal spacing into the form of a list;
step S22: and comparing the grade parameters preprocessed into the list with the interpolated grid data, and if the start-stop value of the grade list can not cover the value range of the grid data, adding a larger grade parameter at the head of the grade list or adding a smaller grade parameter at the tail of the grade list to ensure that the start-stop value of the new grade list covers the value range of the grid data.
4. The meteorological element-based isosurface construction method according to claim 1, wherein: in step S4, the contour clipping includes the following steps:
step S41: selecting 1 contour line, and calculating all intersection points between the contour line and boundary lines of all cutting areas;
step S42: cutting the contour line into a plurality of segments according to the intersection points of the step S41, wherein if no intersection point exists, the contour line is cut into 1 segment;
step S43: taking the 1-segment contour line in the step S42, judging whether the middle point of the contour line is positioned in the cutting area, if so, keeping, otherwise, deleting, circularly judging each segment contour line, and obtaining all the kept line segments;
step S44: and judging all line segments in the cutting area by adopting the methods of the steps S41-S43 for other contour lines.
5. The meteorological element-based isosurface construction method according to claim 1, wherein: in step S52, the obtaining of the contour outer ring includes the following steps:
step S521: selecting 1 contour L1 from the clipped contours, and adding the contour L1 as the outer circle of one contour, wherein the method comprises the following conditions:
if it does not intersect the boundary, it will be treated as an iso-surface outer-ring;
if an intersection point p0 exists, finding a next intersection point p1 on the cutting boundary line from the intersection point, splicing the line segment C1 on the cutting boundary to the contour line of the outer circle, finding the contour line L2 with the p1 as the vertex, if the L2 and the L1 are the same line, terminating the process, otherwise splicing the line segment C1 to the outer circle, finding the next intersection point p3 on the boundary from the tail end point p2 of the L2, namely the intersection point of the L2 and the boundary, thereby obtaining another line segment C2 on the boundary, adding the line segment C2 to the outer circle, further finding the contour line L3 with the p3 as the starting point, judging whether the line segment L3 is consistent with the L0, if the line is consistent, terminating, otherwise, continuing to repeat the searching and splicing steps, and marking all contour lines used in the splicing step as adopted.
Step S522: considering that the joined isosurface may be an annular isosurface, it is further determined whether there is an inner ring in the outer ring obtained in step S521, and for the outer ring obtained in step S521, the inner ring is found from the contour lines that have not been adopted, and the condition that one contour line is the inner ring includes the following cases:
a, the equality line is a closed line;
b, the isoline is surrounded by the outer ring;
c, the contour is not enclosed by other contours inside the outer ring.
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| CN112559619A (en) * | 2020-12-07 | 2021-03-26 | 中科三清科技有限公司 | Method and device for drawing spatial distribution map, electronic equipment and readable storage medium |
| CN112614207A (en) * | 2020-12-17 | 2021-04-06 | 航天宏图信息技术股份有限公司 | Contour line drawing method, device and equipment |
| CN112614207B (en) * | 2020-12-17 | 2024-03-12 | 航天宏图信息技术股份有限公司 | Contour line drawing method, device and equipment |
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