Applications/app_SARDoppler0.md

+# SARDoppler0
+
+SAR Doppler 0 calculation.
+
+## Description
+
+This application estimates the value of Doppler 0 for a SAR image. The algorithm is based on the CDE method described into [Estimating the Doppler centroid of SAR data].
+
+## Parameters
+
+**Input image** `-insar image` *Mandatory* <br />
+Image to perform computation on.
+
+**Output file to store Doppler 0 value** `-outfile filename [dtype]` <br />
+Output file to store Doppler 0 value.
+
+**doppler0 value (output of this application)** `-doppler0 float` *Default value: 0* <br />
+Doppler0 value.
+
+**Available RAM (MB)** `-ram int` *Default value: 256* <br />
+Available memory for processing (in MB).
+
+## Examples
+
+From the command-line:
+
+```
+otbcli_SARDoppler0 -insar s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002.tiff -outfile doppler_file.txt
+```
+
+From Python:
+
+```
+import otbApplication
+
+app = otbApplication.Registry.CreateApplication("SARDoppler0")
+
+app.SetParameterString("insar", "s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002.tiff")
+app.SetParameterString("outfile", "doppler_file.txt")
+
+app.ExecuteAndWriteOutput()
+```
+
+## Limitations
+
+Only Sentinel 1 products are supported for now.