Polar Navigation/Earth Location: This image is a Homolosine projection of the Earth prepared from Advanced Very High Resolution Radiometer(AVHRR) data.
Graphical Orbit Locator
Below is a link to the self-extracting file XTRCTORB.EXE. to your harddrive (this file cannot be processed directly from a browser.) This version can be run only under DOS. It is recommended that it be placed in a subdirectory of its own. Changing to this subdirectory and running XTRCTORB will generate the program GNRLORB.EXE and its associated files. Running GNRLORB and inputting the longitude of the ascending node, available in the equator crossing files, will plot the subtrack of a nominal NOAA-n satellite with marks at five minute intervals from ascending node, and the limits of an AVHRR scan on a choice of map bases:
Optionally, the date and time of the ascending node, available in the equator crossing files, may be entered. In which case the sub-solar point and the terminator are plotted for the beginning and end of the orbit. More information about this file is given in the extracted READ.ME file.
Download: Graphical Orbit Locator
Polar Satellite Equator Crossing Information
The equator crossing data given here is for ascending (northbound) nodes, with the longitude measured eastward. The date and time are presented in two forms:
Clock Drift Files for Polar Satellites