Issues Transforming Radiance to Reflectance in Landsat Collection 2 Level 1 Images

[David_fernandez]

Hello everyone,

I encountered some problems when trying to transform radiance values (W/sr·m²) from a Landsat Collection 2 Level 1 image into a reflectance product (unitless). After some research, I found that creating a s3tbx.properties file in the directory C:\Users\your_name\.snap\etc should allow SNAP to automatically perform the transformation from radiance to reflectance. → see this topic: https://senbox.atlassian.net/wiki/spaces/SNAP/pages/1898054186/S3TBX+FAQs

Unfortunately, despite multiple attempts, I couldn’t get it to work in SNAP versions 10.0 and 11.0. However, I discovered that this method still works in SNAP version 8.0. As a solution, I decided to install SNAP 8.0 specifically for processing Landsat data, while keeping version 11.0 installed for other tasks.

I hope this information helps anyone facing similar issues. Feel free to reach out if you have any questions or need further clarification.

[David_fernandez]

[Marco_EOM]

The issue probably is that it must be named opttbx.properties since version 10.
And the property must be named: opttbx.landsat.readAs

[David_fernandez]

Hello Marco,

Thank you so much for your help and guidance! I followed your suggestion and created the opttbx.properties file in C:\Users\your_name\.snap\etc with the following content: opttbx.landsat.readAs=reflectance

When I loaded the Landsat image in SNAP 11.0, it worked perfectly! I really appreciate your advice—it solved the issue completely.