I am exploring data sources for land surface temperatures (LST) for summer 2021. From Landsat 8 Collection 2 Surface Temperature (https://www.usgs.gov/core-science-systems/nli/landsat/landsat-collection-2?qt-science_support_page_related_con=1#qt-science_support_page_related_con), I can get a surface temperature in kelvin, to which a scale factor has to be applied, and then convert it to Celsius. But I would like to know if this is all the processing this type of data needs before it can be used?
Landsat 8 – Landsat 8 Collection 2 Level 2 Science Product (L2SP)
digital image processingimagerylandsatlandsat 8remote sensing
Related Solutions
Check the thumbnails and the metadata before you download.
You've downloaded a tile that contains only a tiny amount of data in the bottom corner from the edge of a Landsat path. If you want data for that tile, you'll need to choose a different date.
Additionally, that image is stated to have 100% cloud cover.
The data is in degrees Kelvin, but you need to apply the scale factor and offset per the documentation, i.e. DN * 0.00341802 + 149.0.
Lastly you are presented with the "Select Transformation" popup because your QGIS Project has the map CRS set to EPSG:2263 (NAD83 / New York Long Island) and the tile is in a different projection and requires a datum transformation to display. I don't know why you set your map CRS to one that is appropriate for an area on the opposite side of the continent.
Best Answer
You'll want to apply a cloud mask (using the QA_PIXEL bits like this post) to ensure you're only getting surface temps, but otherwise the data are ready to go (once appropriately scaled).