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# SARDoppler0
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SAR Doppler 0 calculation.
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## Description
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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].
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## Parameters
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**Input image** `-insar image` *Mandatory* <br />
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Image to perform computation on.
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**Output file to store Doppler 0 value** `-outfile filename [dtype]` <br />
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Output file to store Doppler 0 value.
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**doppler0 value (output of this application)** `-doppler0 float` *Default value: 0* <br />
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Doppler0 value.
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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_SARDoppler0 -insar s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002.tiff -outfile doppler_file.txt
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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("SARDoppler0")
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app.SetParameterString("insar", "s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002.tiff")
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app.SetParameterString("outfile", "doppler_file.txt")
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app.ExecuteAndWriteOutput()
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```
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## Limitations
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Only Sentinel 1 products are supported for now. |