Polarimetric analysis

[Abhilash]

Hi,

Can polarimetric analysis perfomed over sentinel 1 SLC / GRD data?

If so please let me know the processing steps to be followed for each or either kind of data set (SLC / GRD)…!

Thank you…

[ABraun]

only with SLC data and only to a limited amount because Sentinel-1 only has 2 polarisations:

Please see here for further explanation:

Sentinel-1 SLC Polarimetric Decomposition

most of the decompositions require 4 polarizations: HH, HV, VH and VV. However, most of the Sentinel-1 data in IW mode is in only one or two polarizations: https://www.eodc.eu/sentinel-1-coverage-maps/ There are studies which apply decompositions on dual polarized SAR data: www.mdpi.com/2072-4292/7/6/7447/pdf You can chose the Entropy-Alpha Dual Pol Decomposition for a try. [image] It is discussed in other topics if it makes sense:

How Decompose Sentinel-1 GRDH data

Polarimetric decomposition can only be done with the SLC products. http://sentinel1.s3.amazonaws.com/docs/S1TBX%20Polarimetry%20Tutorial.pdf most of the decompositions require 4 polarizations: HH, HV, VH and VV. However, most of the Sentinel-1 data in IW mode is in only one or two polarizations: https://www.eodc.eu/sentinel-1-coverage-maps/ There are studies which apply decompositions on dual polarized SAR data: www.mdpi.com/2072-4292/7/6/7447/pdf You can chose the Entropy-Alpha Dual …

[Abhilash]

Hi,

Do I need to perform the following steps for polarimetric analysis from S1-SLC dual pol data.?

1 TOPSAR Deburst
2 Calibration to Sigma0
3 Speckle filtering
4 Range Doppler Terrain Correction
…etc

please let me know from scratch what are the steps to be performed for a S1-SLC data for polarimetric analysis.

I would like to perform the analysis for my study area which exists only in IW2 swath. how could I extract the study area portion as a SLC output product for polarimetric analysis?

[ABraun]

you need the complex information, so no calibration to Sigma0 must be performed (there is a checkbox for complex calibration).

Polarimetric analysis is very complex, there is no general workflow. Totally depends on what you want to analyze.

NRC published a nice tutorial on PolSAR:
http://www.nrcan.gc.ca/node/9583
http://www.nrcan.gc.ca/node/9579