Automatic extraction method for Earth observation laser height measurement satellite elevation control points and data processing method

Abstract

The invention relates to an automatic extraction method for Earth observation laser height measurement satellite elevation control points and a data processing method. The laser elevation control point extraction method comprises steps that an effective earth observation laser distance value measurement evaluation method is employed, determined cloudless footprint image blocks are kept, and laser elevation data of determined thin-cloud or thick-cloud footprint image blocks are removed; reflectivity Epsilon smaller than 1 of laser footprint points is taken as a screening parameter, laser footprint points of the kept footprint image blocks are screened, Epsilon=reception pulse energy / emission pulse energy, laser footprint points which have only one wave peak, have the peak value greater than the threshold, have the standard deviation sigma not greater than 3.2ns after waveform fitting are selected from an echo waveform, and parameters used for determining the threshold comprise the emission energy and a reception caliber of a laser device. Through the method, influence of clouds on laser distance measurement can be reduced, laser distance measurement precision can be guaranteed, and accuracy of the laser elevation reference data is effectively improved.

Description

technical field [0001] The present invention relates to a satellite data processing method, more specifically to a method for detecting cloud and fog volume of laser footprint images, an automatic extraction method for elevation control points based on echo waveform processing and cloud volume detection, and an earth observation laser altimetry satellite data Approach. Background technique [0002] With the development of economy, 3D geographic information has been widely used in digital earth, urban planning, environmental protection and other aspects. With the rapid development of remote sensing satellite technology, aerospace photogrammetry has become another means of quickly obtaining 3D geographic information after aerial photogrammetry. Great progress has been made. [0003] For example, Ziyuan-3 is my country's first high-precision civil stereoscopic mapping satellite. Its successful launch and effective application broke my country's long-term dependence on foreign...

AI Technical Summary

Problems solved by technology

Chinese patent application 201310143369.3 discloses a multi-source heterogeneous remote sensing image control point automatic acquisition method, which can automatically extract remote sensing control image points (control point image films) from multi-source heterogeneous images, improving the efficiency and accuracy of control data acquisition. But in essence, it is still an automatic acquisition method of plane control points.

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