| Label | Explanation | Data Type |
Input Radar
Data | The input radar data. | Raster Dataset; Raster Layer |
Output Radar Data
| The corrected geometric terrain radar data. | Raster Dataset |
Polarization Bands
(Optional) | The polarization bands that will be corrected. The first band is selected by default. | String |
DEM Raster
(Optional) | The input DEM. If no DEM is specified or in areas that are not covered by a specified DEM, an approximated DEM, interpolated from metadata tie points, will be created. Use the tie-point approach for full ocean radar scenes only; specify a DEM whenever land features are included in the radar scene. | Raster Dataset; Raster Layer; Mosaic Layer |
Apply geoid correction
(Optional) | Specifies whether the vertical reference system of the input DEM will be transformed to ellipsoidal height. Most elevation datasets are referenced to sea level orthometric height, so a correction is required in these cases to convert to ellipsoidal height.
| Boolean |
Available with Image Analyst license.
Summary
Orthorectifies the input synthetic aperture radar (SAR) data using a range-Doppler backgeocoding algorithm.
The range-Doppler backgeocoding approach computes the radar range and azimuth indices for every DEM grid point using the orbit state vectors. If no DEM is provided, the tool uses the tie points included in the metadata to perform the range-Doppler terrain correction.
Usage
Run the Despeckle tool on the input SAR data before running this tool.
This tool corrects geometric distortions in SAR imagery, accurately geolocates the imagery, and performs quantitative analysis.
This tool does not support a geodatabase as an output location.
If no DEM is specified, the tool will create an approximated DEM, which is interpolated from metadata tie points. Use the tie-point approach for full ocean radar scenes only; specify a DEM whenever land features are included in the radar scene.
Parameters
ApplyGeometricTerrainCorrection(in_radar_data, out_radar_data, {polarization_bands}, {in_dem_raster}, {geoid})| Name | Explanation | Data Type |
in_radar_data | The input radar data. | Raster Dataset; Raster Layer |
out_radar_data | The corrected geometric terrain radar data. | Raster Dataset |
polarization_bands [polarization_bands,...] (Optional) | The polarization bands that will be corrected. The first band is selected by default. | String |
in_dem_raster (Optional) | The input DEM. If no DEM is specified or in areas that are not covered by a specified DEM, an approximated DEM, interpolated from metadata tie points, will be created. Use the tie-point approach for full ocean radar scenes only; specify a DEM whenever land features are included in the radar scene. | Raster Dataset; Raster Layer; Mosaic Layer |
geoid (Optional) | Specifies whether the vertical reference system of the input DEM will be transformed to ellipsoidal height. Most elevation datasets are referenced to sea level orthometric height, so a correction is required in these cases to convert to ellipsoidal height.
| Boolean |
Code sample
This example orthorectifies the radar data using a DEM.
import arcpy
arcpy.env.workspace = r"C:\Data\SAR"
outRadar = arcpy.ia.ApplyGeometricTerrainCorrection(
"IW_manifest_TNR_CalB0_Dspk_RTFG0.crf", "VH;VV", r"C:\Data\DEM\dem10m.tif",
"GEOID")
outRadar.save("IW_manifest_TNR_CalB0_Dspk_RTFG0_GTC.crf")This example orthorectifies the radar data using a DEM.
# Import system modules and check out ArcGIS Image Analyst extension license
import arcpy
arcpy.CheckOutExtension("ImageAnalyst")
from arcpy.ia import *
# Set local variables
in_radar = r"C:\Data\SAR\IW_manifest_TNR_CalB0_Dspk_RTFG0.crf"
out_radar = r"C:\Data\SAR\IW_manifest_TNR_CalB0_Dspk_RTFG0_GTC.crf"
polarization = "VH"
in_dem_raster = r"C:\Data\DEM\dem10m.tif"
geoid_correction = "NONE"
# Execute
outRadar = arcpy.ia.ApplyGeometricTerrainCorrection(in_radar, polarization,
in_dem_raster, geoid_correction)
outRadar.save(out_radar)