A problem occurred during the target product initialisation. Type Operator Exception. Entire image is outside of SRTM valid area

Microwave Toolbox
#1

Hi, I’m new to the forum, and I also recently started using SNAP, version 9.0.0, besides I don’t know English well, so forgive me if my writing is confusing.
I’m trying to proceed to make a Terrain Correction in an image from Sentinel 1, but I always get the same error problem.
Before reaching this point, I previously proceeded to perform the following steps:

  • Subset
  • Apply Orbit File
  • S-1 Thermal Noise Removal
  • S-1 Remove GRID Border Noise
  • Calibration
  • Single Product Speckle Filter
    So far so good, but when I proceed with the following instruction:
  • Range-Dopper Terrain Correction
    The following error message appears: A problem occurred during the target product initialisation. Type OperatorException. Message: Entire image is outside of SRTM valid area. Please use another DEM.

Error message
Error message769×917 325 KB

Exception.txt (7.9 KB)

Please, if someone can solve this problem, I would greatly appreciate it because I have run out of ideas.

Thank you so much

#2

What is the latitude of your image? SRTM goes from ~60 S to ~60 N.

#3

Thank you for responding so quickly.
I already understood, my image is out of range of SRTM, it is located on the Baffin Island in Nunavut, Canada, lat = ( 66°00’- 65°30’) N, and long (65°00’- 66°00’) W approximately.
So, how can I proceed to make the terrain correction whit SNAP?, or be able to georeference it, since the image presents the inverted poles.

Thank you so much

#4

Is the Copernicus 30m DEM an option for you?
Or you could create your own DEM for your region:
DEM generation with Sentinel-1

#5

I’m learning how to use SNAP completely on my own, and there are a lot of things I don’t know that I have to learn as I go along. Until just two months ago I didn’t even know SNAP existed, so it’s all new to me.

I’m going to read the documentation you suggest to see how I can create my own DEM in that region.

Thank you so much

#6

DEM-generation from S-1 data often leads to disappointing results. You should try the global Copernicus DEMs first.

2 Likes
#7

Thanks for the help I received with my previous problem with SNAP, happily I managed to solve it.
Now I have a new problem but related to Copernicus, so I don’t know if you can help me, but anyway I’m going to expose my problem.
I’m trying to download Sentinel 1 images taken in October 2021, but I get a warning that says the following: “Offline product retrieval has been initiated. Please check again your Cart to know when it will be online.”
I waited a while for the images to be available and then this other warning comes up: “The retrieval of offline data is temporary unavailable, please try again later.”
Does this mean that the images are unrecoverable? How can that be possible?
Thanks