DEMS

These virtual images of the Toolik Lake area of Alaska were produced using Vista-Pro software and a DEM created using interferometric SAR (INSAR) data obtained from the Alaskan SAR Facility (ASF). 

First, SAR data were collected with the European Space Agency’s Earth Remote Sensing satellites (ERS-1 and ERS-2).  A tandem mission in the 90’s operated ERS-1 and ERS-2 in a one-day trailing orbit allowing interferometric radar coverage of the Toolik region. These INSAR data are noted for producing high accuracy DEMs.  Using these INSAR data and ASF software, we produced a 20 meter DEM of the area.  Next, six U2 CIR aerial photographs from 6 August 1982 were rectified to UTM coordinates and mosaiced to produce a single seamless CIR image of the Toolik Lake area.  Vista-Pro software was then used to produce a virtual flyby of the area using solar ephemeris parameters that matched those of the U2 mission.