I have one question. I had ‘Sigma0_IW2_VV’, then as I need it in db. I used
Raster----data conversion----linear to/from db.
Now I have two bands.
I want to save ‘ Sigma0_IW2_VV_db’ in Geotif. I am using
File—export----geotiff—subset-----I check only ‘Sigma0_IW2_VV_db’----but I got one massage (look at below).
When I open geotiff in QGIS, it is not ‘Sigma0_IW2_VV_db’ while it is Sigma0_IW2_VV. I do not know what can I do for having ONLY ‘Sigma0_IW2_VV_db’ in QGIS.
If the dB-band is virtual you need to convert it to a real band before you can delete the linear one.
As you told me I should convert virtual ban to a real band before you can delete the linear one. I did that by this steps:
Rater—Data conversion----convert data type----processing parameters (I only chose ‘Sigma0_IW2_VV_db’). I can open it but I do not know why minimum and maximum amount before and after conversion is difference now? Which one it correct, before conversion or after conversion?
maybe Geotiff cannot handle negative values (signed integer). The db values ranging from -40 to +5 are the correct ones.
OK but I can not see values ranging from -40 to +5. Do you mean -24.861 to 0.081?