Archive Meta Data

Author(s)

Aslak Grinsted

Title

Hagen Ice Velocities

Description

Ice velocities from Hagen Glacier derived from Landsat using the ImGRAFT feature tracker. 
-----------------------------------------------------------------------------------------
Processed by Aslak Grinsted 2018
For a project lead by Anne Solgaard


The folder contains a matlab file for each image pair. 

The filenames has the form:
V_Hagen_[Ayear][Ajulianday]-[Byear][Bjulianday]_[path][row]

Each file has these variables:
         tA: A matlab datenum for sceneA
         tB: A matlab datenum for sceneB
         fA: filename of scene A
         fB: filename of scene B
         px: [98×168 double] Grid of Easting coordinates 
         py: [98×168 double] Grid of Northing coordinates 
         Ia: geotiffinfo of sceneA - contains projection information
         Ib: geotiffinfo of sceneA - contains projection information
         dt: days between scene A and B
          C: Similarity score of templatematch  (see help on imgraft templatematch function)
     Cnoise: Background similarity score of templatematch
        snr: C/Cnoise
    options: Options for ImGRAFT templatematch function (see help on imgraft templatematch function)
         dx: Easting displacement (already divided by dt)
         dy: Northing displacement (already divided by dt)
        lat: Geographical coords for px,py
        lon: Geographical coords for px,py

The displacements have not been corrected for bad georeferencing. 


The ice velocities has been extracted along a flowline and corrected for bare rock displacement. These data can be found in the file: hagen-aslakVs.mat. This file contains these variables:

    AnneLine: definition of flowline
    Vextract: Velocities along flowline. The first two columns hold the datenums of scene A and scene B. 
        dist: distance along line
       xline: projected coordinates of line