serdawe Posted January 30, 2019 Report Share Posted January 30, 2019 Dear all, sorry if this topic exist here... I have a few question: I have downloaded three Landsat images (L1TP) because my study area is very big, there is overlapping between images. I would like to make NDVI for that area, and I am interested what the steps are: Do I need to do atmospheric correction first, then I have use copy raster tool to eliminate black NoData part of the images?....after that how to merge (join) images but to avoid lines because of overlapping. After that I guess I can make NDVI? Thank you all in advance Quote Link to comment Share on other sites More sharing options...
Lurker Posted February 3, 2019 Report Share Posted February 3, 2019 better you join/mosaic first, and then with all area already in one file, you can begin NDVI analysis Harrisgeospatial has nice tutorial bout this : https://www.harrisgeospatial.com/docs/NDVI.html njoy Quote Link to comment Share on other sites More sharing options...
serdawe Posted February 4, 2019 Author Report Share Posted February 4, 2019 Ok thank you, and about atm. correction (in FLAASH) ? Should I do it on the separated images or on the mosaic? Thank you very much? Quote Link to comment Share on other sites More sharing options...
Lurker Posted February 5, 2019 Report Share Posted February 5, 2019 see here : https://gis.stackexchange.com/questions/62624/questions-regarding-the-processing-of-mosaic-landsat-8 here the link that compare both method : http://www.faqs.org/faqs/sci/Satellite-Imagery-FAQ/part3/section-14.html some people prefer to mosaic first and then analysis like me, and some prefer analysis first and then mosaic you may read to see the differences and make a decision 1 Quote Link to comment Share on other sites More sharing options...
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