ERS-1/2 SAR IM Precision L1 [SAR_IMP_1P]

The SAR Precision product is a multi-look (speckle-reduced), ground range image acquired in Image Mode. This product type is most applicable to users interested in remote sensing applications, but is also suitable for calibration purposes. The products are calibrated and corrected for the SAR antenna pattern and range-spreading loss. Radar backscatter can be derived from the products for geophysical modelling, but no correction is applied for terrain-induced radiometric effects. The images are not geocoded, and terrain distortion (foreshortening and layover) has not been removed. The numbering sequence relates to the satellite position and therefore differs between Ascending and Descending scenes. Product characteristics: - Pixel size: 12.5 m (range - across track) x 12.5 m (azimuth - along track) - Scene area: 100 km (range) x at least 102.5 km (azimuth) - Scene size: 8000 pixels range x at least 8200 lines (azimuth) - Pixel depth: 16 bits unsigned integer - Total product volume: 125 MBs - Projection: Ground-range - Number of looks: 3

SAR 精确产品是一款在图像模式下获取的多视（斑点减少）地面距离图像。此类产品类型最适用于对遥感应用感兴趣的用户，同时也适用于校准目的。该产品经过校准和校正，以补偿 SAR 天线模式及距离展宽损耗。可从产品中推导出雷达后向散射，用于地球物理模型构建，但对于地形引起的辐射效应未进行校正。图像未进行地理编码，且未消除地形畸变（前向缩短和重叠）。编号序列与卫星位置相关，因此在不同升轨和降轨场景中存在差异。产品特性包括：- 像素尺寸：12.5 米（距离-沿航向）x 12.5 米（方位-横航向）- 场景面积：100 公里（距离）x 至少 102.5 公里（方位）- 场景尺寸：8000 像素距离 x 至少 8200 行（方位）- 像素深度：16 位无符号整数- 产品总体积：125 兆字节- 投影：地面距离- 视数：3