Demonstration of techniques used for geo-location of satellite imagery

Remote sensing platforms are often equipped with state-of-the-art instrumentation to record both the satellite position and line-of-sight (LOS) aspect. Typically, a Global Positioning System (GPS) can provide very accurate satellite position information to approximately 10-20 meters. In addition, some sophisticated aspect instrumentation can determine a sensor LOS with micro-radian accuracy. Unfortunately, not all remote sensing satellites have pointing or position equipment that can reliably yield such accurate determinations. In these cases, an alternate approach to determining absolute position knowledge is necessary. Gee-location is the process of assigning accurate, absolute coordinates to each pixel, or set of pixels in an image, based on ground features visible in that image. The process assumes some knowledge of the satellite's position and line-of-sight orientation.