SARCorrelationGrid

Computes SAR correlation shift (into temporal domain).

Description

This application computes correlation shifts between two images : shift in range and shift in azimut. The inputs of this application are MultiLooked images (real images).

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 Master image (real image) -inmaster image Mandatory
Master Image (real image).

Input Slave image (real image) -inslave image Mandatory
Slave Image (real image).

MultiLook factor on distance -mlran int Default value: 3
MultiLook factor on distance.

MultiLook factor on azimut -mlazi int Default value: 3
MultiLook factor on azimut.

Grid step for range dimension (into SLC/SAR geometry) -gridsteprange int Default value: 150
Grid step for range dimension (into SLC/SAR geometry).

Grid step for azimut dimension (into SLC/SAR geometry) -gridstepazimut int Default value: 150
Grid step for azimut dimension (into SLC/SAR geometry).

Set 0 to offset of first Line and Colunm of output grid -nooffset int Default value: 0
If 1, then no offset for the first L/C if output grid.

Output Correlation grid (Vector Image) -out image [dtype] Mandatory
Output Correlation Grid Vector Image (Shift_ran, Shift_azi, Correlation_rate).

Available RAM (MB) -ram int Default value: 256
Available memory for processing (in MB).

Examples

From the command-line:

otbcli_SARCorrelationGrid -inmaster s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002_ML.tiff -inslave s1b-s4-slc-vv-20160929t014610-20160929t014634-002277-003d71-002_ML.tiff -out out_CorrelationGrid.tiff

From Python:

import otbApplication

app = otbApplication.Registry.CreateApplication("SARCorrelationGrid")

app.SetParameterString("inmaster", "s1a-s4-slc-vv-20160818t014650-20160818t014715-012648-013db1-002_ML.tiff")
app.SetParameterString("inslave", "s1b-s4-slc-vv-20160929t014610-20160929t014634-002277-003d71-002_ML.tiff")
app.SetParameterString("out", "out_CorrelationGrid.tiff")

app.ExecuteAndWriteOutput()

Limitations

Only Sentinel 1 (IW and StripMap mode) and Cosmo products are supported for now.