I’m relatively new to sentinl-hub and i’m trying to get acess to sentinel1 images.
My goal is to get sentinel-1 image with the VV and VH bands in db (decibels) values.
I have manage to retrieve image using the following script but there are few things I don’t understand:
what are the units of that image? I have seen in the documentry that there are
GAMMA0_ELLIPSOIDbut i’m not sure how can I define which one I want in the python API.
From how I understand the script, what I gonna get is VV, 2VH, VV/VH /100 and dataMask. Is there any way to get only the VV and VH? without the 2VH ot the vv/vh?
relate to question no. 2: why do you provide those bands (2 * VH ) ect. and not the VV and VH directly?
is there any way to get it already in decibels?
When I put large time interval, which image am I going to see? the first one? mosaic? mean value?
It says that the Orthorectification correction is an optional correction that applied on the image. how can I make sure that this was applied on the image I retrieved?
this is how I manage to retrieve the image:
evalscript = """ //VERSION=3 return [VV, 2 * VH, VV / VH / 100.0, dataMask] """ time_interval = '2019-07-06', '2020-07-07' request = SentinelHubRequest( evalscript=evalscript, input_data=[ SentinelHubRequest.input_data( data_collection=DataCollection.SENTINEL1_IW_DES, time_interval=time_interval, ) ], responses=[ SentinelHubRequest.output_response('default', MimeType.PNG) ], bbox=bbox, config=config ) image = request.get_data() plot_image(image, factor=3.5/255, clip_range=(0,1))