The invention provides a method for extracting an elevation
control point through assistance of
satellite laser altimetry data. The method is characterized in that an actual measurement waveform and a
simulation observation waveform are taken as
data processing objects; and by grouping the actual measurement waveform and the
simulation observation waveform and considering the distance between two waveforms in the direction of the time axis and the similarity between the waveforms, through the combination of a
remote sensing geometric model, registration of light spots and the
topography and extraction of the elevation
control point are achieved. The method comprises following steps of (1) initially refining a high-mark
stereo image or an InSAR orientation parameter; (2) generating the high-mark
stereo image or an InSAR DSM; (3) dividing actual measurement
laser altimetry data groups; (4) extracting waveforms of the actual measurement groups; (5) searching targets and designing
simulation observation; (6) carrying out simulation observation on the DSM to acquire the waveform of each simulation
observation group; (7) matching the actual measurement group with the whole waveform of each simulation
observation group; (8) carrying out registration on the
light spot positions and the DSM plane positions; (9) matching the actual measurement group with corresponding waveform of each
measurement station of the optimal simulation
observation group; (10) extracting the DSM elevation
system difference and the elevation
control point of each
light spot region; (11) extracting the elevation control point of an image; and (12) carrying out DSM elevation refinement, sensor calibration,
laser altimetry and combined
processing of image
remote sensing data. According to the invention, registration of spatial targets of
satellite laser altimetry data and
satellite remote sensing data of different topographies, and extraction of the elevation control point can be achieved and spatial association can be established for combined
processing of the satellite
laser altimetry data and the remote
sensing data.