Help with sen2cor and SNAP

Optical Toolbox sen2cor
#81

hey, ABraun

It seems you are a expert in using SNAP. I have two questions to ask using Sen2Cor.

(1) I open data

image.png793x243 13.7 KB
when i process, the result show:

how should I address this problem?
(2) can you open this type of data?

image.png917x250 16.8 KB
i try to open in SNAP, but when the data was loaded, there is nothing in product Explorer.
Thank you very much for your help. I am a little urgent about the processing, please help me as soon as possible
Thanks again!

#82

It’s really hard to detect errors from the distance so I just can tell how sen2cor works for me:

  1. Installing sen2cor
    Download sen2cor.zip, exctract and run python setup.py install

  2. Downloading and extracting S2 data in C:\Temp\S2\S2A_MSIL1C_20170410T103021_N0204_R108_T32UMU_20170410T103020
    Keeping the full path is crucial
    Open it via File > import > Optical Sensors > Sentinel-2 > S2M-SI S2A

    grafik.png930×492 29 KB

  3. Display in SNAP

    grafik.png1920×1030 2.48 MB

  4. Adjusting path names under Tools > Manage external Tools > sen2cor > edit
    Make sure that you enter the full path to your python.exe for the variable PYTHON_BIN (the one you installed sen2cor for otherwise the required modules are not found)

    grafik.png1213×625 15.4 KB

  5. Manage external Tools > sen2cor > run
    Select input file and resolution and hit run

    grafik.png649×541 16.8 KB

  6. For single tiles, the output raster is written in C:\Temp\S2A_MSIL2A_20170410T103021_N0204_R108_T32UMU_20170410T103020.SAFE
    [2] Output product is shown in the product explorer

  7. View results and compare raster values of both products
    Both statistically and visually the rasters have changed

    grafik.png1536×824 2.1 MB

    Before:
    grafik.png1014×667 40.1 KB

    After:
    grafik.png1014×667 41.3 KB

  8. Resample all rasters to one resolution:

    grafik.png601×525 18.3 KB

  9. Export resampled files as GeoTiff (File > Export > GeoTiff) so it can be opened in a GIS

    grafik.png1920×1029 1.88 MB

  10. The scene classification can be found under Bands > quality > quality_scene_classification

    grafik.png1416×832 166 KB

  11. If you need to undertake adjustments you can open L2A_GIPP.xml under C:\Users\_username_\Documents\sen2cor\cfg

    grafik.png1515×908 68.5 KB

Last but not least - have a look at the manual for the details:

1 Like
No scene classification processing for 10 m resolution in sc_only mode
Sen2Cor: ImportError: No module named osgeo.gdal_array
#83

Hey, Braun,

I sent you attachment in case of open failure. Please check it.

Thanks a lot

Best regard
Xianghong Che

Xianghong Che | Global Land Cover Facility | 4321 Hartwick Building, College Park, MD 20740
E-mail:chexh.15b@gmail.com

problem.pptx (88.3 KB)