Understory terrain inversion method, device, equipment and medium

Abstract

The invention discloses an understory terrain inversion method, device, equipment and medium. The method is as follows: acquiring dual-station TanDEM‑X data in an understory terrain inversion area and performing interference processing to obtain an interference phase and a volume decoherence coefficient; Remove the flat ground, simulated terrain, noise, orbit error and other phases from the interferometric phase to obtain the residual terrain phase; use the residual terrain phase and simulated terrain phase to reconstruct the high-precision InSAR terrain phase; build a forest inversion model, and combine ICESat-2 ground altimetry Point adjustment calculation is performed to solve the unknown parameters in the model; using the volume decoherence coefficient and high-precision InSAR terrain phase information, the understory terrain data of the entire inversion area is calculated according to the understory inversion model. The invention is a robust and feasible method for estimating understory topography, which can be widely used in measuring the height of understory topography in a large range using TanDEM‑X data.

Description

technical field [0001] The invention relates to the field of geodetic surveying based on Synthetic Aperture Radar Interferometry (InSAR), in particular to a method, device, equipment and medium for understory terrain inversion based on dual-station TanDEM-X data. Background technique [0002] Digital elevation model (DEM) is an indispensable basic drawing for national economic construction, social development and national security. In particular, high-precision terrain height information under the cover layer (such as: understory terrain) is of great significance to the fields of natural resource survey, infrastructure construction, national economic development, and national defense security. At present, in order to obtain high-precision terrain height information, synthetic aperture radar (InSAR), LiDAR technology and optical remote sensing technology are commonly used technical means. Among them, InSAR technology has the advantages of all-weather, all-day, short observat...

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Problems solved by technology

Among them, the first type of method usually needs to rely on a large amount of external auxiliary data (such as: temperature data, precipitation data, low-resolution vegetation height data) for modeling, and in order to obtain high-precision forest terrain results, it usually requires research Certain prior information of the region, and the accuracy of the auxiliary data and the selection of the model further limit the practicability of this method; compared with the first method, the second method requires multi-polarization data to separate the surface scattering information, Due to the lack of spaceborne SAR systems that can obtain multi-polarization data, the current method can only conduct related experiments through airborne SAR data, which limits the acquisition of large-scale forest terrain

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