SARDeburst¶
This application performs deburst of Sentinel1 IW SLC images by removing redundant lines.
Description¶
Sentinel1 IW SLC products are composed of several burst overlapping in azimuth time for each subswath, separated by black lines [1]. The deburst operation consist in generating a continuous image in terms of azimuth time, by removing black separation lines as well as redundant lines between bursts.
Note that the output sensor model is updated accordingly. This deburst operation is the perfect preprocessing step to orthorectify S1 IW SLC product with OTB [2] without suffering from artifacts caused by bursts separation. Two modes are available for the output image : with all samples andwith only valid samples
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 Sentinel1 IW SLC Image -in image Mandatory
Raw Sentinel1 IW SLC image, or any extract of such made by OTB (geom file needed)
Output Image -out image [dtype] Mandatory
Deburst image, with updated geom file that can be further used by Orthorectification application. If the input image is a raw Sentinel1 product, uint16 output type should be used (encoding of S1 product). Otherwise, output type should match type of input image.
Select the modes for output image -onlyvalidsamples bool Default value: false
If true, the selected mode is with only valid samples.
Available RAM (MB) -ram int Default value: 256
Available memory for processing (in MB).
Examples¶
From the command-line:
otbcli_SARDeburst -in s1_iw_slc.tif -out s1_iw_slc_deburst.tif
From Python:
import otbApplication
app = otbApplication.Registry.CreateApplication("SARDeburst")
app.SetParameterString("in", "s1_iw_slc.tif")
app.SetParameterString("out", "s1_iw_slc_deburst.tif")
app.ExecuteAndWriteOutput()
Limitations¶
Only Sentinel1 IW SLC products are supported for now. Processing of other Sentinel1 modes or TerrasarX images will result in no changes in the image and metadata. Images from other sensors will lead to an error.