A typical AVIRIS data stream does not have enough information in it for a typical user to perform a full georectification by themselves. However, typically the more recent AVIRIS data (after about 2000?) is distributed with a georectification applied, although you can request these as ungeorectified images, too. The georectification is not perfect (as mentioned in many AVIRIS meetings), however. The *.nav file associated with the data does have time, lat, lon, alt, heading, and attitude information, but only on a 1 Hz level. For the high altitude data this is probably sufficient; for low altitude it is not. Unfortunately, the format of this file has changed several times, and sometimes the angular information is in degrees, sometimes it is in fractions of a circle, so to get degrees you multiply by 180. -M --