Method for realizing rugged topography remote sensing scene simulation

Abstract

The invention relates to a method for realizing rugged topography remote sensing scene simulation, comprising: (1) inputting time, geographic coordinates, atmospheric condition and the like of the simulated scene into atmospheric transmissivity model Modtran with medium spectral resolution, and acquiring the irradiancy of direct solar radiation and atmospheric scattering on the level ground as well as atmospheric uplink transmittance and atmospheric path radiance; (2) inputting solar zenith angle, azimuth angle and digital elevation model, and calculating gradient, slope direction, solar incident angle, visible factors in the sky, topography visible factors and shadow regions; (3) according to the irradiancy of direct solar radiation and atmospheric scattering on the level ground and the data of ground surface reflectivity, calculating the irradiancy of direct solar radiation and atmospheric scattering on the rugged ground by utilizing the gradient, and calculating the solar incident angle, the visible factors in the sky, the topography visible factors and the shadow regions, the irradiancy of surrounding indirect radiation, thus forming total irradiancy received by ground surface by the irradiancy of direct solar radiation and atmospheric scattering on the level ground, the data of ground surface reflectivity and the irradiancy of direct solar radiation and atmospheric scattering on the rugged ground; (4) generating radiance data of all points on the ground at the entrance pupil of a sensor by utilizing the data of ground surface reflectivity, the atmospheric uplink transmittance and the atmospheric path radiance.

Description

Technical field [0001] The invention relates to a method for realizing remote sensing scene simulation of undulating terrain, especially a method for generating sensor pupil radiance data under undulating terrain, which has important value in surface irradiance calculation and remote sensing imaging simulation, and belongs to remote sensing imaging simulation technology field. Background technique [0002] The generation of sensor entrance pupil radiance data is the key technology of remote sensing scene simulation. In the case of a flat and uniform surface, the illumination received by the ground includes two parts: direct sunlight and atmospheric scattered light. These two parts enter the sensor after being reflected by the ground and transmitted by the atmosphere. At the same time, the atmospheric path radiation also enters the sensor. In practice, the terrain fluctuates, and the atmospheric radiation is not affected by the terrain fluctuations; however, the direct sunl...

AI Technical Summary

Problems solved by technology

[0004] There are many factors involved in converting the irradiance received on the horizontal ground to the undulating terrain, and the existing technologies adopt a simplified method: one is to consider only the influence of low-order items and linearize the complex nonlinear calculation process; the other is to ignore some factors , simplify terrain information extraction

The irradiance received by the undulating ground is a complex nonlinear calculation process, and linearization will bring errors to the simulation results

Ignoring some influencing factors and simplifying the extraction of topographical information leads to low accuracy of simulation results. At the same time, the surface conditions are complex and changeable. Usually, factors that have a small impact and can be ignored, in some cases, become irrelevant, resulting in simulation results that are different from those of The radiance actually received by the entrance pupil of the sensor has a large discrepancy

Images