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].

This application has several output images and supports “multi-writing”. Instead of computing and writing each image independently, the streamed image blocks are written in a synchronous way for each output. The output images will be computed strip by strip, using the available RAM to compute the strip size, and a user defined streaming mode can be specified using the streaming extended filenames (type, mode and value). Note that multi-writing can be disabled using the multi-write extended filename option: &multiwrite=false, in this case the output images will be written one by one. Note that multi-writing is not supported for MPI writers.

Parameters

Input image -insar image Mandatory
Image to perform computation on.

Output file to store Doppler 0 value -outfile filename [dtype]
Output file to store Doppler 0 value.

doppler0 value (output of this application) -doppler0 float Default value: 0
Doppler0 value.

Available RAM (MB) -ram int Default value: 256
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 (IW and StripMap mode) and Cosmo products are supported for now.