as per earthviewer .eta georeferencing xml files top left corner = northern and western most point on the map N = northing value W = westing value lower right corner = southern and eastern most points on the map S = lower corner northing E = lower corner westing RES = resolution = 65535 in this example vlon = vehicle longitude (from gps) vlat = vehicle latitude (from gps) N = red node object W = green node object ORANGE = RES / (N - S) BLUE = RES / (W - E) x = (W - vlon)*BLUE INTEGER z = (N - vlat)*ORANGE INTEGER