I have a difficult to process the Capella SP mode SLC data. After I read the data, it can be calibration, multilooks, but it can not be radiometric-terrain-flatteing, it shows error message “metadata slant_range_to_first_pixle has not been set”. Can anybody help me out with the problem? Thank you!
@jun_lu can you help?
Could you check the “slant_range_to_first_pixel” field in the Abstracted_Metadata in your Capella SP SLC product to see if it has the proper value? If yes, then check the same field in the calibrated product and the multilooked product.
Hi Jun_Lu,
I checked the abstract Metadata in my Capella SP SLC product, the slant_range_to_pixel is 99999.0, which means invalid value.
I gues in the _extended.json file, there is not enough data to be abstract from.
Can we calculate the slant_range_to_first_pixel, then manually modify the _extended.json to make SNAP correctly abstract the value ?
Thank you for your help.
Like I said before. SNAP works with Capella SS mode SLC, but it does not work with Capella SP mode SLC. I checked the extend.json files fothese two products. I found in the SS mode SLC extended.json, collect.iamge.image_geometry type is “slant_range”, but in the SP mode SLC extended.jsoncollect.image.image_geometry type is “pfa”. Can SNAP provide the capella product reader to deal with “PFA” image_geometry type?
Yes, you can manually modify the _extended.json file and update the “range_to_first_sample” field if you know the correct value. This value is generally provided by the vendor and I’m not sure if we have enough information to calculated it.
As for the reader for “PFA” product, I think you can feedback your request to ESA’s website. If approved, we can implement it.