Combined Adjustment for GF-14 Satellite Stereo Imagery and ICESat-2 Laser Altimetry Data
GF-14 is currently one of the satellites with the highest surveying and mapping accuracy in China.To further improve elevation accuracy of GF-14 satellite,it was combined with ICESat-2 laser altimetry data,which has obvious advantages in elevation measurement accuracy.Based on the preliminary screening of ICESat-2 laser altimetry data using various laser attribute information,a combined adjustment strategy was designed by introducing elevation check points,which refined the application of laser elevation control points,resolved the registration issues between the stereo image data and laser altimetry data,and obtained the high-precision 3D information of the target during the combined adjustment process.Then,the strategy was performed and analyzed using two experimental areas.In the experiments,the elevation root mean square error(RMSE)of processed stereo images in two areas was better than 1 m.The results show that the developed strategy effectively addresses the challenges of elevation control point selection and data registration in the combined adjustment process,which significantly enhances the elevation accuracy.Therefore,the proposed combined adjustment strategy can support the project of the global 1∶10 000 mapping without ground control points,and promote the application of GF-14 satellite and ICESat-2 laser altimetry data in land surface surveying and mapping.
combined adjustmentstereo imageryGF-14 satelliteICESat-2 satelliteelevation control pointdata registrationelevation check pointrational function model
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