SIR-C Survey Data
DTHDR.TXT is an ASCII file that contains radar, image, and processing parameters of the corresponding data take. It also contains a table describing each image segment in terms of GMT, latitude, and longitude at image center.
QA.TXT is an ASCII file that contains Q/A parameters of the corresponding take.
DOPPLR.TXT is an ASCII file that contains Doppler centroid estimates of the corresponding data take.
ROLL.TXT (SIR-C data only) is an ASCII file that contains roll angle estimates of the corresponding data take.
SEG_nn.IMG contains the image data for image segment nn annotated with one second tick marks, center GMT, center latitude and longitude, and track angle. This file is a simple pixmap 2000 bytes wide by 798 lines high; there are no GIF, TIFF, etc. header records embedded in the image. Note that the SEG_nn.IMG file contains both image data and annotation. A sample image with annotation is available.