GRD Border Noise Removal

Microwave Toolbox Problem Reports
1

Dear all,
I am having some issues processing some GRD images applying the BNR step.
I’m processing this image
S1A_IW_GRDH_1SDV_20210712T181445_20210712T181510_038748_049283_2E8E
and the steps so far used are:

  1. subset [using as AOI POLYGON((-6.1851371215820405 53.391095819496975,-6.095529882812509 53.391095819496975,-6.095529882812509 53.34356953973678,-6.1851371215820405 53.34356953973678,-6.1851371215820405 53.391095819496975)) ]
  2. apply the orbit file
  3. BNR

Well, after the BNR most of the pixels on the water are replaced with a NaN value like in this figure

image
image990×787 289 KB

On the opposite, if I don’t apply any subsetting no NaN values are in the image after the BNR

image
image1035×835 156 KB

Do you know why this difference? Is necessary always apply the BNR to the whole image without any subsetting? My idea was to reduce the size of the image just around my AOI to speed up the processing.

Thanks in advance for any suggestions.

S Savastano

2

Hi all,
any suggestions/tips/guidance for this issue? (@ABraun @mengdahl @marpet @oana_hogoiu).
Thanks always for any help on this matter

S Savastano

3

Do we have a “recommended graph” for GRD-processing including border noise removal? @jun_lu @mfitrzyk

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