Elevation calibration method and device for digital elevation model data

Abstract

The invention relates to an elevation calibration method and device for digital elevation model data. The method comprises the following steps: unifying height datum of ice cloud and ground level geoscientific laser altimetry data and height datum of digital elevation model data;extracting a geoscientific laser altimetry data elevation value and a digital elevation model elevation value of the same point location; establishing an elevation calibration model using the geoscientific laser altimetry data elevation value and the digital elevation model elevation value of the same point location; and calibrating the digital elevation model data using the elevation calibration model. According to the technical scheme, the elevation calibration model is established based on the ice cloud and ground level satellite geoscientific laser altimetry data, elevation calibration is performed on the digital elevation model of space shuttle radar mapping plan through the elevation calibration model so that the elevation value precision of the digital elevation model is greatly improved, the calibrated digital elevation model becomes reliable fundamental geographic information data and provides reference for developing various scientific research and engineering applications.

Description

technical field [0001] The invention relates to a digital elevation model in the field of surveying and mapping, in particular to a method and a device for calibrating the elevation of digital elevation model data of the Space Shuttle Radar Topographic Mapping Project (SRTM). Background technique [0002] Digital Elevation Model (DEM for short), which is a solid ground model that expresses the ground elevation in the form of a set of ordered numerical arrays, is a branch of Digital Terrain Model (DTM for short). All terrain feature values ​​can be derived from this. It is generally believed that DTM describes the spatial distribution of various geomorphic factors including elevation, such as slope, slope aspect, slope change rate and other factors including linear and nonlinear combinations, and DEM is a zero-order simple single-item digital geomorphic model , other landform characteristics such as slope, aspect and slope change rate can be derived on the basis of DEM. Sin...

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Problems solved by technology

However, the C-band radar signal obtained from the DEM has a strong penetrability to the surface (especially in glaciers, deserts, etc.), up to 10m, causing the surface elevation of the digital elevation model to be lower than the real elevation; in addition, in mountainous areas, due to high The difference is large, the terrain undulates violently, and the shadow and overlay of the mountain also seriously affect the elevation accuracy of the digital elevation model, so directly applying the digital elevation model will bring large errors

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