Topographic map space element acquisition method based on oblique photography

Abstract

The invention discloses a topographic map space element obtaining method based on oblique photography, and relates to the technical field of geographic surveying and mapping. Carrying out aerial triangulation calculation on the oblique photograph to obtain a map projection image and point cloud data; performing ground object plane extraction on the map projection image to obtain line elements, and processing the point cloud data to obtain elevation elements; and editing and processing the plane and elevation elements to obtain a topographic map. According to the invention, oblique photography and aerial triangulation technologies are fused, and a non-stereoscopic observation topographic map surveying and mapping method in which plane and elevation are operated separately is established, so that a new operator can carry out topographic map production without stereoscopic observation training, thereby changing a traditional topographic map surveying and mapping method of stereoscopic observation or multi-image observation of photogrammetry. And the precision requirement of topographic map surveying and mapping is met.

Description

technical field [0001] The invention relates to the technical field of geographic surveying and mapping, in particular to a method for acquiring spatial elements (including plane and elevation elements) of topographic maps based on oblique photography. Background technique [0002] The topographic map surveying method of the traditional photogrammetric stereo observation adopts operational processes such as aerial triangulation, stereo image pair establishment, and stereo mapping. The spatial elements of , which have been used around the world for 50 to 60 years, are still the mainstream way of topographic map production by various surveying and mapping units. [0003] Surveying methods used in the prior art such as figure 2 As shown, this method has always had two insurmountable problems in production practice: the first problem is that the operator must perform stereoscopic observation, and the stereoscopic observation ability often needs eight weeks of training to meet t...

AI Technical Summary

Problems solved by technology

[0003] Surveying methods used in the prior art such as figure 2 As shown, this method has always had two insurmountable problems in production practice: the first problem is that the operator must perform stereo observation, and the stereo observation ability often requires eight weeks of training to meet the requirements of production operations; the second The problem is that the elevation accuracy is difficult to meet the requirements of large-scale map production specifications, and a large number of field measurements are required

Images