Problems with opening Landsat data

ric218 · August 20, 2020, 9:32am

Hello,
I’ve got a proplem opening the Landsat 8 data in Snap.
I tried to drag and drop the file into to product explorer, but it always says ‘No appropriate product reader found’.

I am thankful for any help!

ABraun · August 20, 2020, 9:33am

have you tried File > Import > Optical Sensors > Landsat > Landsat 8 30m > select the file that ends which _MTL.txt

ric218 · August 20, 2020, 9:42am

Yes, I tried that, but then I can only see the radiance bands.

ABraun · August 20, 2020, 10:03am

are you sure you downloaded the reflectance product?

ric218 · August 20, 2020, 10:07am

I downloaded the Level-1 GeoTIFF Data Product from Earth Explorer…

ABraun · August 20, 2020, 10:16am

aren’t these provided as radiance?
https://www.usgs.gov/land-resources/nli/landsat/using-usgs-landsat-level-1-data-product

marpet · August 20, 2020, 10:35am

The landsat data provides both radiance and reflectance. By default SNAP reads the radiance.

You can set the -Ds3tbx.landsat.readAs=reflectance property in the s3tbx.properties file to switch to reflectance.
See also this post.

This refers to Landsat 8 but it is the same for Landsat 7

agos · February 20, 2021, 7:42am

I have SNAP 8.0 - but Landsat does not appear in the sensor list of Import > Optical Sensors ?

mengdahl · February 20, 2021, 10:39am

Isn’t that a bit clunky way to select a band?

marpet · February 21, 2021, 8:54am

It is not just selecting a band. It selecting how the raw data shall be converted. The are different factors stored in the Landsat data and by specifying the property one can select which are applied.
But yes, that’s not a good solution. But it has historic reasons. Probably today this could be done differently.