Applications/app_SARCorrectionGrid.md

+# SARCorrectionGrid
+
+Computes SAR correction grid.
+
+## Description
+
+This application creates a deformation grid by correcting the DEM grid with correlation grid.
+The output grid is a VectorImage composed of two values : shift in range and shift in azimut. The inputs of this application are also vector image with three components. This application can directly take the projectd DEM.
+
+## Parameters
+
+**Input DEM grid (Vector Image)** `-indemgrid image` *Mandatory* <br />
+Input DEM Grid Vector Image (Shift_ran, Shift_azi, NbDEMPts for contribution).
+
+**Input Correlation grid (Vector Image)** `-incorgrid image` *Mandatory* <br />
+Input orrelation Grid Vector Image (Shift_ran, Shift_azi, Correlation_rate).
+
+**Output Correction grid (Vector Image)** `-out image [dtype]` *Mandatory* <br />
+Output Correction Grid Vector Image (Shift_ran, Shift_azi).
+
+**Threshold for correlation rate** `-threshold float` *Default value: 0.3* <br />
+Threshold for correlation rate.
+
+**Maximum difference between input grid values and mean values** `-gap float` *Default value: 0.7* <br />
+Maximum difference between input grid values and mean values.
+
+**Give an advantage to DEM or Correlation Grid** `-advantage string` <br />
+Give an advantage to DEM or Correlation Grid.
+
+**Available RAM (MB)** `-ram int` *Default value: 256* <br />
+Available memory for processing (in MB).
+
+## Examples
+
+From the command-line:
+
+```
+otbcli_SARCorrectionGrid -indemgrid ./demGrid.tiff -incorgrid ./corGridL.tiff -out correctionGrid.tif
+```
+
+From Python:
+
+```
+import otbApplication
+
+app = otbApplication.Registry.CreateApplication("SARCorrectionGrid")
+
+app.SetParameterString("indemgrid", "./demGrid.tiff")
+app.SetParameterString("incorgrid", "./corGridL.tiff")
+app.SetParameterString("out", "correctionGrid.tif")
+
+app.ExecuteAndWriteOutput()
+```
+
+## Limitations
+
+Only Sentinel 1 products are supported for now.