合成孔径雷达——合成孔径雷达图像

司机简称

SAR_CEOS

Driver built-in by default

This driver is built-in by default

这是CEOS SAR图像文件的只读读取器。要使用,请选择主图像文件。

This driver works with most Radarsat, JERS-1 and ERS data products, including single look complex products; however, it is unlikely to work for non-Radar CEOS products. The simpler CEOS driver is often appropriate for these.

This driver will attempt to read 15 lat/long GCPS by sampling the per-scanline CEOS superstructure information. In the case of products from the Alaska Satellite Facility, it will obtain corner coordinates from either the map projection record in the case of ScanSAR products, or the facility data record for non-ScanSAR products. It also captures various pieces of metadata from various header files, including:

CEOS_LOGICAL_VOLUME_ID=EERS-1-SAR-MLD
CEOS_FACILITY=CDPF-RSAT
CEOS_PROCESSING_FACILITY=APP
CEOS_PROCESSING_AGENCY=CCRS
CEOS_PROCESSING_COUNTRY=CANADA
CEOS_SOFTWARE_ID=APP 1.62
CEOS_ACQUISITION_TIME=19911029162818919
CEOS_SENSOR_CLOCK_ANGLE=  90.000
CEOS_ELLIPSOID=IUGG_75
CEOS_SEMI_MAJOR=    6378.1400000
CEOS_SEMI_MINOR=    6356.7550000

SAR-CEOS驱动程序还包括对SIR-C和PALSAR极化数据的一些支持。SIR-C格式包含压缩散射矩阵形式的图像,描述如下 here . GDAL在读取数据时对其进行解压缩。PALSAR格式包含几乎完全对应于3x3厄米协方差矩阵元素的频带-请参见 ERSDAC-VX-CEOS-004A.pdf 完整描述的文档(像素存储在第193页上描述)。GDAL在读取它们时将它们转换为复杂的浮点协方差矩阵带。用散射矩阵元素HH、HV(=VH)和VV表示协方差矩阵的约定如下所示。注意,矩阵的非对角元素是复数,而对角值是实数(尽管表示为复数带)。

  • 波段1:协方差_11(Float32)=HH*conj(HH)

  • 波段2:协方差12(CFloat32)=sqrt(2) HH 联合体(高压)

  • 波段3:协方差_13(CFloat32)=HH*conj(VV)

  • 波段4:协方差_22(Float32)=2 HV 联合体(高压)

  • 波段5:协方差_23(CFloat32)=sqrt(2) HV 联合体(VV)

  • 波段6:协方差_33(Float32)=VV*conj(VV)

波段的标识也反映在元数据中。

注:执行为 gdal/frmts/ceos2/sar_ceosdataset.cpp .

驱动程序功能

Supports Georeferencing

This driver supports georeferencing

Supports VirtualIO

This driver supports virtual I/O operations (/vsimem/, etc.)