SARCalibration¶
对合成孔径雷达图像进行辐射定标。支持以下传感器：TerraSAR-X、Sentinel1和Radarsat-2。支持单一外观复合体(SLC)和检测到的产品作为输入。
描述¶
合成孔径雷达定标的目标是提供像素值可以直接与场景的雷达后向散射相关的图像。该应用程序允许计算TerraSAR-X、Sentinel1 L1和Radarsat-2传感器的Sigma零(辐射校准)。元数据自动从图像产品中检索。该应用程序支持复杂和非复杂图像(SLC或检测到的产品)。
参数¶
Input Image -in image Mandatory
Input complex image
Output Image -out image [dtype] Mandatory
Output calibrated image. This image contains the backscatter (sigmaNought) of the input image.
Remove Noise -removenoise bool Default value: false
Remove the noise of the input product. The type of noise and the denoising method depends on the input sensor. The following sensors are supported:
- 哨兵1：使用去噪LUT去除热噪声 [1]
- TerraSAR-X：噪声当量Beta零点计算 [2] ，请参阅应用程序限制
Lookup table -lut [sigma|beta|gamma|dn] Default value: sigma
Lookup table values are not available with all SAR products. Products that provide lookup table with metadata are: Sentinel1, Radarsat2.
- Use sigma nought lookup
Use Sigma nought lookup value from product metadata - Use beta nought lookup
Use Beta nought lookup value from product metadata - Use gamma nought lookup
Use Gamma nought lookup value from product metadata - Use DN value lookup
Use DN value lookup value from product metadata
Available RAM (MB) -ram int Default value: 256
Available memory for processing (in MB).
实例¶
从命令行执行以下操作：
otbcli_SARCalibration -in RSAT_imagery_HH.tif -out SarRadiometricCalibration.tif
来自Python的评论：
import otbApplication
app = otbApplication.Registry.CreateApplication("SARCalibration")
app.SetParameterString("in", "RSAT_imagery_HH.tif")
app.SetParameterString("out", "SarRadiometricCalibration.tif")
app.ExecuteAndWriteOutput()
局限性¶
TerraSAR-X去噪的实现仍处于实验阶段。最近尚未验证结果，请参阅OTB第2158期