Aslak Grinsted‎ > ‎Misc. Debris‎ > ‎

Tracking ice motion in Landsat 8

posted Jun 11, 2014, 1:54 AM by Aslak Grinsted   [ updated Jun 11, 2014, 1:57 AM ]
I have been attempting to track ice motion in landsat 8 files. I have only been able to find the L1T files. These are terrain corrected files. Unfortunately for my study region (the Renland ice cap, East Greenland) the DEM used in this processing is of too poor quality and which introduces large geodetic errors. DEM errors can be seen as residual perspective effects [Click image on the right to expand to an animated GIF showing flipping between two images]. 

If you know where to get L1G, then please email me! 

I would therefore really like to have the L1G product and account for the terrain correction my self (using gimpdem). 

Another advantage of L1G over L1T is that there is less resampling which degrades feature tracking performance. 

(This work is partly motivated by testing a new open source feature tracking & georeferencing toolbox for matlab we have been working on. I am looking forwards to putting it on github.)

Descriptions of the levels of processing 

  • Level 1 Systematically Corrected (L1G)
    • The Level 1G (L1G) data product provides systematic radiometric and geometric accuracy, which is derived from data collected by the sensor and spacecraft. The scene will be rotated, aligned, and georeferenced to a user-specified map projection. Geometric accuracy of the systematically corrected product should be within 250 meters (1 sigma) for low-relief areas at sea level.
  • Level 1 Terrain Corrected (L1T)
    • The Level 1T (L1T) data product provides systematic radiometric accuracy, geometric accuracy by incorporating ground control points, while also employing a Digital Elevation Model (DEM) for topographic accuracy. Geodetic accuracy of the product depends on the accuracy of the ground control points and the resolution of the DEM used.