RAMS Final Velocity Product Documents

Even though the Drygalsky Ice Tongue is in more of a steady state of flow, we used ever increasing search radiuses working our way from the interior (slow flow, small search radius) to the coastal area (faster, larger search radius). Very little editing was done on the Drygalsky results prior to conatination into a final product (click on "1) Velocity ASCII files" link above).

In order to capture the diverse velocity field of the Thwaites and Pine Island Glaciers (years 2004 and 2007) multiple sets of RAMS Vphase parameters had to be used, resulting in multiple sets of overviews (ov_## files listed below). Each overview was edited for any erroneous velocity vectors and concatinated into a final product (click on "1) Velocity ASCII files" link above).

A detailed description of all the RAMS VphaseTool Phase I parameters (registration and creation of interferograms) was provided by the Vexcel Corporation, the developers of RAMS, and is available in addendum III of the BPRC Tech Report BPRC Tech Report

In the creation of the interferograms, the three prominent parameters used for estimating a range of velocities are the 1) lower coherence threshold, 2) offset chip size and 3) offset search radius, all other default parameters were used. A description of the 'optimum' search radius and chip sizes is included below ('Optimal Search Radius and Chip Size' link).

README File
Readme file associated with each *.tar file. Please read to familiarize yourself with the contents of each file.

Location of the Thwaites and Pine Island overviews (ov_*) for years 2004 and 2007 Shows the location of each of the ov* files that made up the concatinated Final Velocity ASCII file (if more than one).

Optimal Search Radius and Chip Size
Note: A chart of Search Radius and Chip Size parameter for individual overviews is forthcoming.