[img]http://www.david-taylor.pwp.blueyonder.co.uk/wxsat/images/2002-09-14-n16-17-FValk.jpg[/img]GroundMap is a tool to make your weather satellite images fit standard map projections - a process sometimes called rectification or geo-location - making it easy to join several NOAA satellite passes into one composite image covering a much wider area, or to combine your satellite images with other weather data. You can use data from either APT or HRPT satellites. You need ground-location data produced either my WXtrack program for APT images, or by my HRPT Reader for HRPT data. As an example, here is a mixture of NOAA-16 and NOAA-17 passes over Europe which have been rectified by GroundMap to a common projection and subsequently combined. Never before have you seen images covering this size of area at this sort of resolution!