Bands in Sentinel 1 Level 1 (GRD, RAW and SLC) products - basic information


#21

you are the scientist :wink:

If you want to use the rasters from SNAP in a GIS you can simply open the .img files in the data folder of the BEAM-DIMAP format. I suggest this because conversion to GeoTiff has some negative aspects:

  • increased file size
  • basically a duplicate of the img file
  • unnecessary processing time
  • loss of metadata information
  • conversion issues regarding data type (compression, range of values…)

#22

I am not scientist, just s/w engineering!!!
Anyway, we developed many analysis with IDL s/w read the geotiff format.
We do not have GIS.


#23

alright :slight_smile:

Just be aware of the mentioned error sources, especially the data type.


#24

I have zone question,
If product is between 2 zones, which zone you will use for
creating the xml using gpt command line? where exactly the parameters to define the zone from GRD or SLC products?


#25

you define the UTM zone in the projection step, usually in Range Doppler Terrain correction.
Generally you take the zone with the larger coverage in your scene.


#26

Yes that is work perfect.
I build the xml not using the snap. where I get information to get zone?


#27

I would first build a graph in SNAP then export it as an XML. Then you see how the parameters are compoed.


#28

Do all the processing in BEAM-DIMAP and export to Geotiff in a separate step only after the processing is done. Not doing this can cause strange problems.


#29

How to processing data eliminate the bad data on the both side/top/bottom?
I did by using subset, but that is manual, I would like to automate.


#30

Hi !
Out of all the available bands (real (i) and imaginary (q) parts and a virtual intensity) and subswaths(IW1,IW2,IW3) in level-1 SLC which one should i use for calibration in SNAP for getting backscatter data and can you tell step by step process for getting backscatter data .


#31

Please have a look here: