Method of Extracting Height Control Points of Building Areas by Satellite Laser Altimetry

Abstract

The invention provides a method for extracting elevation control points of building areas by satellite laser altimetry. Accurately extract Gaussian sub-waveform characteristic parameters and overall fitting; use high-resolution images or digital surface model (DSM) data, and Gaussian sub-wave half-width value parameters to select laser altimetry data containing contour plane layers within the spot range; Establish the corresponding relationship between the contour plane layer and its reflected Gaussian wavelet; use the precise distance of the center position of the sub-waveform characteristic parameters obtained by decomposition to locate the center of the spot, and calculate the absolute elevation of the corresponding contour plane layer; combine with high-resolution images , making remote sensing image elevation control points. The invention uses the full-waveform large-spot laser altimetry data as the remote sensing image elevation control point to expand the field from flat terrain to building areas and other areas containing contour plane layers.

Description

Technical field [0001] The present invention belongs to the field of laser radar, and it is particularly involved in the auxiliary image of the on-load laser radar data to use technology. Specifically, there is a satellite laser measurement building area based on laser-based geometric positioning and full-wave decomposition. Elevation control point method. Background technique [0002] Laser radar and imaging spectroscopy, imaging radar and called three major front-edge technology in the field of land observations, some foreign developed countries start early in the high field of on-line laser radar, and the NASA launched in 2003. Equipped with ICESAT-1 satellite with Earth Science Laser System (Glas), which has a high precision of 0.15m, which has obtained a large number of high-precision global three-dimensional space information, but due to laser failure, the Star has stopped data collection in 2009. jobs [1] . In order to continue to complete the scientific tasks of ICESAT-1,...

AI Technical Summary

Problems solved by technology

[0006] Due to the large area of ​​the laser footprint, the low precision of plane positioning, and the original echo signal reflects the comprehensive superposition effect of the reflection signals of multiple objects and targets in the spot, it is difficult to directly extract the precise elevation value in the spot, making laser altimetry The application of data in areas with complex structures such as cities and as an auxiliary remote sensing image photogrammetry is greatly restricted. At present, there is no relevant achievement of using the full waveform decomposition method of laser altimetry to extract the elevation control points of building areas.

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