A Method for Layout of Low Altitude Photogrammetry Image Control Points in a Strip Survey Area

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 laying out image control points for low-altitude photogrammetry in a belt-shaped survey area. Background technique [0002] Traditional large aircraft aerial photogrammetry has disadvantages 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 UAV low-altitude digital aerial photogrammetry technology in recent years makes up for it It overcomes the shortcomings of traditional manned aerial survey, and is gradually becoming an effective supplementary means for satellite remote sensing, manned and ground remote sensing, especially suitable for quickly obtaining large-scale digital maps with high precision in small areas and difficult to fly areas. However, UAV aerial survey images have a smaller image size and more image pairs, and the image quality ...

AI Technical Summary

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

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