Method and system for error judgment of topographic map measurement system

Abstract

The invention discloses a method and a system for judging errors of a topographic map surveying system. The method comprises the following steps: selecting a predetermined quantity of check points; reading image space coordinates of check points in a left satellite remote sensing image aligning piece and a right satellite remote sensing image aligning piece; obtaining object space difference values of the check points by the least square adjustment method according to the image space coordinates; calculating object space coordinates of the check points and residue errors of object space adjustment values in an X direction and a Y direction; and judging whether the residue errors are subjected to a standard normal distribution, if so, judging the system errors are not generated, and otherwise, judging the system errors are generated. By virtue of the method and the system, the system errors are judged after block adjustment is calculated; the great difference in the final topographic map caused by the system errors can be judged; the errors are detected in intermediate steps, so that the measurement operations of a plurality of subsequent steps are eliminated; the manpower and material resources are saved.

Description

technical field [0001] The invention relates to the field of surveying and mapping, in particular to a method and system for judging the error of a topographic map measurement system. Background technique [0002] At present, in the field of photogrammetry and remote sensing, the method of aerial photogrammetry mapping is the main means of producing and updating national basic scale topographic maps. Although aerial image mapping has a sound theoretical basis and a relatively mature production process, it has the following defects: (1) Due to the low aerial photography height when acquiring aerial images, the quality of aerial images is less affected by the atmosphere and terrain. Seriously, before taking aerial photography, it is necessary to investigate the climate, weather, terrain, etc. (2) Since the image size of the aerial camera is generally 23cm×23cm, affected by the height of the flight, it covers a small area, and the number of aerial images required for surveying...

AI Technical Summary

Problems solved by technology

Although aerial image mapping has a sound theoretical basis and a relatively mature production process, it has the following defects: (1) Due to the low aerial photography height when acquiring aerial images, the quality of aerial images is less affected by the atmosphere and terrain. Seriously, before taking aerial photography, it is necessary to investigate the climate, weather, terrain, etc. (2) Since the image size of the aerial camera is generally 23cm×23cm, affected by the height of the flight, it covers a small area, and the number of aerial images required for surveying and drawing topographic maps of larger areas is relatively large. Therefore, the number of control points required for measurement in the field is also large, and at the same time increases the workload of the office processing, consuming a lot of time, manpower, material and financial resources; (3) can not be measured in some special cases Maps, such as: border mapping, no-man's land mapping, no-fly zone mapping, etc.

At present, when using satellite remote sensing images for topographic map measurement, when performing aerial triangulation of stereo image pairs, there are systematic errors usually after block adjustment.

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