The method of cutting topographic section information from topographic map

A topographic profile and topographic map technology, applied in image data processing, 2D image generation, instruments, etc., can solve the problems that auditors cannot check the accuracy and authenticity of the results, waste the time of technicians, and inaccurate cutting results, etc. Accurate and reliable profile information, fast data processing, and improved efficiency

Active Publication Date: 2016-05-04
CHANGJIANG SURVEY PLANNING DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since MicroStation currently does not have software or tools for cutting sections on topographic maps, in the prior art, every time a worker needs to cut a topographic section, they can only open the topographic map with MicroStation on the computer and obtain the section by manual interpretation Horizontal distance, elevation, or a more primitive method, print out the graphics, measure the horizontal distance and elevation of the section with a ruler, and enlarge or reduce the corresponding manually measured plane position coordinates and elevation values ​​according to the proportional relationship. In this process , the workload is heavy and the operation is cumbersome, which greatly wastes the time of the technicians, and even some staff are impatient, omitting some steps and workload, resulting in inaccurate cutting results, and the auditors cannot test the accuracy and authenticity of the results. sex

Method used

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  • The method of cutting topographic section information from topographic map
  • The method of cutting topographic section information from topographic map
  • The method of cutting topographic section information from topographic map

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to figure 1 , figure 2 and image 3 As shown, the topographic profile information method for cutting topographic maps includes the following steps:

[0038] 1), image 3 Central terrain figure 1 Draw a section line 2 at the position where the section needs to be cut, copy the section line 2 and shift it by 0.001 meters; the section line 2 adopts a straight line segment, of course, it can also use a broken line, an arc, etc.;

[0039] 2) Catch the four endpoints of the two parallel lines 2 in step 1) with a fence, enclose the terrain lines between the two parallel lines 2, and cut, paste and translate the enclosed terrain lines Outside the original topographic map, each unit segment 3 of the topographic line is formed;

[0040] 3), the terrain plane position coordinates and the elevation value of the point on each unit segment 3 of the topographic line surrounded in the extraction step 2) are saved in the text file;

[0041] 4), extract the plane position ...

Embodiment 2

[0050] Such as figure 1 , figure 2 and Figure 4 As shown, the topographic profile information method for cutting topographic maps includes the following steps:

[0051] 1), Figure 4 Central terrain figure 1 Draw a section line 2 at the position where the section needs to be cut, and the section line 2 adopts a straight line segment, of course, a broken line, arc, etc. can also be used;

[0052] 2), catch the two endpoints of a section line 2 in step 1) with a fence, and enclose the terrain line above the section line 2; cut and paste the terrain line enclosed in step 2) to terrain figure 1 outside;

[0053] 3) Connect the endpoints of the cut topographic line with lines in order to obtain the line 6 of the intersection points of the section line and the topographic line, then move the line 6 away in translation, surround it with a fence, and extract the line segment The terrain plane coordinates and elevation values ​​of each point on 6, the terrain plane coordina...

Embodiment 3

[0064] refer to figure 1 , figure 2 and Figure 5 Shown, the software that adopts the inventive method design is used in the technical field of cutting dam body section, comprises the following steps:

[0065] 1), Figure 5 On the position where the dam body 7 needs to be sectioned in the middle top view, draw a section line 2, copy and translate the section line 2 by 0.001 meters; the section line 2 adopts a straight line segment, of course, a broken line, an arc, etc. can also be used;

[0066] 2) Catch the four endpoints of the two parallel lines 2 in step 1) with fences, enclose the dam surface lines between the two parallel lines 2, and cut the enclosed dam surface lines Paste and translate to the outside of the dam body to form unit segments 3 of the dam surface line;

[0067] 3), extract the dam surface plane position coordinates XY and the elevation value Z of the midpoint on each unit section 3 of the dam surface line surrounded in step 2), and sort all the midp...

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Abstract

The invention relates to a method for acquiring topographic profile information according to a topographic map. The method comprises the following steps: 1), drawing a section line on the to-be-cut position of the three-dimensional topographic map, copying and moving the section line by 0.001 meter in parallel to form two parallel lines; 2), capturing four end points of the two parallel lines by an enclosure, shearing, copying and moving the enclosed form line in parallel out of the original topographic map; 3), extracting coordinates and elevation value of a topographic plane position of points on each unit section of the moved form line, and saving the coordinates and elevation value to this document; 4), reading the coordinates XY and elevation value Z of the plane position in the document, and calculating the distance of every adjacent point on the XY plane as increment of the X' axle, wherein Y' is equal to Z; and 5), drawing a form line profile in proportion according to the X' Y' coordinate values. The method is quick in processing data, accurate and reliable in profile information, capable of reducing unnecessary loss caused by human factors in the work, and can be widely applied to such fields as survey, management, design, construction, supervision and the like.

Description

technical field [0001] The invention relates to a method for obtaining terrain profile information according to a topographic map, in particular to a method for cutting topographic profile information from a topographic map. Background technique [0002] Since MicroStation currently does not have software or tools for cutting sections on topographic maps, in the prior art, every time a worker needs to cut a topographic section, they can only open the topographic map with MicroStation on the computer and obtain the section by manual interpretation Horizontal distance, elevation, or a more primitive method, print out the graphics, measure the horizontal distance and elevation of the section with a ruler, and enlarge or reduce the corresponding manually measured plane position coordinates and elevation values ​​according to the proportional relationship. In this process , the workload is heavy and the operation is cumbersome, which greatly wastes the time of the technicians, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 彭荣生
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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