Dear All, I am looking for Sentinel1A radar images on Alaska Facility Web domain and I found some dates that have ready-processed GRD products. For some other dates, the only available product are SLC. Could you please review the steps below to convert from IW-SLC to IW-GRD then from IW-GRD to flood inundation.
From Sentinel1A IW-SLC to IW-GRD for Flood inundation:
1- Here is the steps for conversion from SLC to GRD
It is clear that the Radiometric calibration step is repeated in 1 and 2, is that OK to repeat it or just to keep it in 1.
Speckle Filter is repeated in 1 and 2, however I have read before that it OK to repeat the filter to achieve better results.
For the Geometric correction step (Slant range to ground range coefficients) in No 1, could you please suggest best polynomial degree and interpolation method based on your experience. Personally I would go with lower polynomial degree (2) and cubic interpolation. I do believe also that there were polynomials with 5 coefficients in S1 products.
In general I suggest to you read many articles and then start searching this forum, it has a lot of discussions, please use the help of SNAP, and google the process you wants to apply according to your goal and method, there area a plenty of videos and tutorial.
There was an event organized by ESA in 2018 named Mapping water bodies from space 2nd conference presentations are here - http://mwbs2018.esa.int/agenda/
I hope it will provide you some ideas.
Thanks! i have an error in the “Slant range to ground range” step. do you know how to deal with that?
Details:
File name: S1A_IW_SLC__1SDV_20210328T111633_20210328T111700_037198_046176_52FB
Error describe:
a problem occurred during the target product processing.
Type: OperatorException.
Message: java.lang.ArrayIndexOutOfBoundsException.