地学基准数据对SAR地理编码图像拼接的影响

描述了星栽SAR-geocoding（SAR地理编码）图像的拼接处理过程。由于两幅图像在地理编码中采用的地图投影方式和地球模型不同，所以在拼接处理时，需要在同一坐标系下通过地学基准转换参数进行修正。地学基准转换参数的偏差会影响图像像素的地理经纬度和高程，从而影响图像拼接的精度。对Radarsat卫星地理编码图像的拼接处理表明：地学基准转换参数的变化会导致拼接图像有大约几百米的位置偏差。

Influence of Geodetic Datum on SAR Geocoding Image Mosaic

The process of SAR geocoding imago mosaic is described in this paper. In this process, the geocoding image mosaic needs rectification depending on the geodetic datum because of difference of the earth models and map projections used in the image mosaic. And the pixel latitude, longitude and height will be changed owing to the geodetic datum diversity, so the image mosaic precision will be infected. The results of Radarsat geocoding image mosaic indicate that the change of geodetic datum can result in position error about several hundreds of meters in image mosaic.