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Photo-control-point survey method through strip-shaped testing area low-altitude photogrammetry

A photogrammetry and image control point technology, applied in the direction of photo interpretation, etc., can solve the problems of inconvenient implementation of elevation control point spacing, large field workload, and difficulty in surveying, so as to reduce field workload and labor. Strength, avoid the effect of excessive construction difficulty

Active Publication Date: 2017-10-20
CHINA MAJOR BRIDGE ENERGINEERING
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Problems solved by technology

Obviously, the distance between the elevation control points estimated from this is not easy to implement, the workload in the field is too large, the measurement is difficult, and in fact it is not completely reasonable

Method used

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  • Photo-control-point survey method through strip-shaped testing area low-altitude photogrammetry

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0044] See figure 1 As shown, the embodiment of the present invention provides a low-altitude photogrammetric image control point placement method for a strip survey area, which includes the following steps:

[0045] S1. Determine the bandwidth, belt length, terrain category (flat land, hilly land, mountain, alpine land), forest vegetation coverage and water distribution of the area to be tested.

[0046] According to different project construction stages and project requirements, determine the scale of the surveying map: 1:500, 1:1000 or 1:2000 according to relevant specifications.

[0047] According to industry standards, the surveying accuracy is determined according to the terrain category and the surveying scale of the area to be surveyed. The surveying accuracy includes the error in the plane position and the height of the empty three encrypted points, and th...

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Abstract

The invention discloses a photo-control-point survey method through strip-shaped testing area low-altitude photogrammetry and relates to the technical field of photogrammetry. The method comprises the following steps: determining mapping accuracy according to strip width, strip length and terrain category of a to-be-tested area and a mapping scale; determining a course point distance a and a lateral point distance b of the photo-control point according to the terrain category, the strip width, the mapping scale and the mapping accuracy of the to-be-tested area; symmetrically arranging one row or a plurality of rows of photo-control points on the left and right sides parallel to central lines of track, and arranging landmarks; measuring the coordinates and heights of the photo-control points by using a total station, a level gage or a GNSS RTK method. According to the method disclosed by the invention, the quantity and position of reasonable photo-control points can be determined according to actual conditions, the condition that the construction difficulty is extremely high due to excessively dense photo-control points can be avoided, the field workload can be alleviated, the labor intensity is reduced, and the construction period is shortened. Meanwhile, the problem that the mapping accuracy cannot meet the specified requirement due to extremely low density of the photo-control points is solved.

Description

Technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a method for deploying image control points for low-altitude photogrammetry in a strip survey area. Background technique [0002] Traditional large aircraft aerial photogrammetry has shortcomings such as long flight time, poor maneuverability, low real-time performance, high cost, limited accuracy, and not suitable for dangerous areas. The rapid development of drone low-altitude digital aerial photogrammetry technology in recent years makes up for it In order to overcome the shortcomings of traditional manned aerial surveys, it is gradually becoming an effective supplementary method for satellite remote sensing, manned remote sensing and ground remote sensing. It is especially suitable for quickly acquiring high-precision large-scale digital maps of small areas and difficult-to-flight areas. However, the image size of UAV aerial survey images is small, with many image pairs, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/34
CPCG01C11/34
Inventor 吴迪军熊伟何广源潘飞李剑坤谢坤吴珍丽李书银薛万唱
Owner CHINA MAJOR BRIDGE ENERGINEERING
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