2.1 GeoSAR / PurVIEW TLM radargrammetry
First, a GeoSAR X- or P-band DEM is overlaid with a GeoSAR X- or P-band ORI to derive a stereo pair image set. This stereo pair is then loaded into the PurVIEW 3D editing environment and TLM features are extracted.
GeoSAR TLM features are then compiled using a unified geodatabase with stereo imagery, contours, and feature tables generated from project specifications, as well as ancillary aerial or satellite photography, LIDAR data or other standard data types. These ancillary data are used as interpretation, classification, and compilation guides. Features are generally extracted by theme, with specialty production teams assigned to certain themes.