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# SARDEMGrid
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Computes deformation DEM grid.
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## Description
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This application creates a deformation grid related to the DEM with projections into Master and Slave SAR geometries.
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The output grid is a VectorImage composed of three values : shift in range, shift in azimut and a number of DEM points for contribution. The inputs of this application are SAR images. This application can directly take the projected DEM as inputs.
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## Parameters
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**Input SAR Master image** `-insarmaster image` *Mandatory* <br />
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Master SAR Image.
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**Input SAR Slave image** `-insarslave image` *Mandatory* <br />
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Slave SAR Image.
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**Input DEM** `-indem image` *Mandatory* <br />
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Input DEM.
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**Input vector of DEM projected into SAR Master geometry** `-indemprojmaster image` <br />
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Input vector of DEM projected into SAR Master geometry.
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**Input vector of DEM projected into SAR Slave geometry** `-indemprojslave image` <br />
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Input vector of DEM projected into SAR Slave geometry.
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**Output DEM grid (Vector Image)** `-out image [dtype]` *Mandatory* <br />
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Output DEM Grid Vector Image (Shift_ran, Shift_azi, NbDEMPts for contribution).
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**MultiLook factor on distance** `-mlran int` *Default value: 3* <br />
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MultiLook factor on distance.
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**MultiLook factor on azimut** `-mlazi int` *Default value: 3* <br />
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MultiLook factor on azimut.
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**Grid step for range dimension (into SLC/SAR geometry)** `-gridsteprange int` *Default value: 150* <br />
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Grid step for range dimension (into SLC/SAR geometry).
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**Grid step for azimut dimension (into SLC/SAR geometry)** `-gridstepazimut int` *Default value: 150* <br />
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Grid step for azimut dimension (into SLC/SAR geometry).
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**Available RAM (MB)** `-ram int` *Default value: 256* <br />
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Available memory for processing (in MB).
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## Examples
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From the command-line:
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```
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otbcli_SARDEMGrid -indem ./S21E055.hgt -insarmaster s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002_ML.tiff -insarslave s1b-s4-slc-vv-20160929t014610-20160929t014634-002277-003d71-002_ML.tiff -out demGrid.tif
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```
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From Python:
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```
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import otbApplication
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app = otbApplication.Registry.CreateApplication("SARDEMGrid")
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app.SetParameterString("indem", "./S21E055.hgt")
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app.SetParameterString("insarmaster", "s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002_ML.tiff")
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app.SetParameterString("insarslave", "s1b-s4-slc-vv-20160929t014610-20160929t014634-002277-003d71-002_ML.tiff")
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app.SetParameterString("out", "demGrid.tif")
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app.ExecuteAndWriteOutput()
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```
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## Limitations
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Only Sentinel 1 (IW and StripMap mode) and Cosmo products are supported for now. |