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A non-traversal search method for intersection points of aerial gravimetric network

An aviation gravity and search method technology, applied in the field of aviation gravity exploration, can solve problems such as low work efficiency and slow search speed, and achieve the effect of improving calculation efficiency and shortening time consumption

Inactive Publication Date: 2019-08-23
中国自然资源航空物探遥感中心
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be used when the survey line and the cutting line are vertically distributed in the north-south and east-west directions, and cannot be used in other situations where the survey line is laid out along any direction; It can meet the calculation requirements of small-scale test areas, and the work efficiency is very low for the calculation of air gravity survey areas of tens of thousands to hundreds of thousands of kilometers

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  • A non-traversal search method for intersection points of aerial gravimetric network
  • A non-traversal search method for intersection points of aerial gravimetric network
  • A non-traversal search method for intersection points of aerial gravimetric network

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Experimental program
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Embodiment 1

[0023] This embodiment provides an overall flow of a non-traversal search method for an intersection point of an airborne gravimetry network.

[0024] Such as figure 1 As shown, a non-traversal search method for intersections of airborne gravity surveying network includes the following steps: loading surveying network data; calculating intersections one by one until the calculation of all intersections is completed; outputting the information of intersections.

[0025] Wherein, the method for loading survey network data includes the following steps: reading survey network data; extracting survey lines and cutting lines.

[0026] Wherein, the method for calculating the intersection point is as figure 2 As shown, it includes the following steps: preliminary calculation of the position of the intersection point; finding the 4 target measuring points closest to the position of the intersection point on the surveying line and cutting line; and calculating the intersection point f...

Embodiment 2

[0035] This embodiment provides an improvement to the non-traversal search method for the intersection point of the airborne gravimetry network described in Embodiment 1.

[0036] According to the method for calculating the intersection described in embodiment 1, after adopting the jumping approximation method to calculate the intersection position for the second time, after updating the steps of 4 target measuring points, increase the following steps:

[0037] Judging whether there is an intersection between the target measuring points;

[0038] If there is no intersection, then further judge the distance between the target measuring point and the intersection;

[0039] If the distance exceeds 2 point distances, use the jumping approximation method to calculate the intersection position for the third time, and update the 4 target measuring points again; this step can be repeated for multiple iterations;

[0040] If the distance is not more than 2 points, use sliding fine-tun...

Embodiment 3

[0043] This embodiment provides a computer program implementation of the non-traversal search method for the intersection of airborne gravity surveying network described in Embodiment 1. This embodiment uses C# programming language, Visual Studio 2013 compilation and debugging.

[0044] In this embodiment, two intersection calculation functions are designed to meet different requirements when searching for intersections.

[0045] The first is the IsCrossPoint() function. This function can return the two judgments and the final intersection coordinates in the position distribution of the intersection of the survey line segment and the cutting line segment, and return three results; the second is the getCross() function, which only returns the intersection point of two line segments Coordinates, intersection points can be distributed inside and outside the line segment.

[0046] Using the cross product of two vectors is equal to the area of ​​a parallelogram formed by two vect...

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Abstract

An airborne gravity survey network intersection non-traversing search method comprises: calculating to obtain an approximate intersection, and finding measuring points closest to the approximate intersection from measuring lines and cutting lines; using a leap approximation method to re-calculate an approximate intersection according to target measuring points that are found, and approximating theintersection for the second time; judging whether the target measuring pints are truly intersected; if not, subjecting the target measuring points to fine-adjusting sliding until the target measuringpoints are completely intersected. The airborne gravity survey network intersection non-traversing search method has the advantages that a traditional traversing search method is avoided, so that calculating efficiency is greatly improved; for instance, certain survey network data include about 160000 measuring line kilometers and 5460000 measuring points, data reading and sorting time is about 9.6 s, search and information extraction with 29517 intersections takes less than 0.09 s, and time for airborne gravity survey network intersection searching is effectively shortened.

Description

technical field [0001] The invention belongs to aerial gravity exploration, and relates to a search method for an intersection point of aerial gravity surveying network. Background technique [0002] Aerogravity surveying is a widely used airborne geophysical prospecting method. In actual work, the method of laying vertically intersecting measuring lines and cutting lines is usually used to form an airborne gravity measuring network. Before carrying out airborne gravity measurement accuracy assessment and line adjustment, it is first necessary to quickly and accurately search for the intersection points of airborne gravity measurement network. [0003] "Theory and Method of Airborne Gravity Survey Line Network Adjustment" (Li Hai. 2002. [Master Thesis]. Zhengzhou: Chinese People's Liberation Army Information Engineering University. P18-21.), "Airborne Gravity Survey Theory, Method and Application Research" (Sun Zhongmiao. 2004. [Doctoral Thesis]. Zhengzhou: University of I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/00
Inventor 屈进红姜作喜罗锋周锡华薛典军李芳
Owner 中国自然资源航空物探遥感中心