I am working with ENVI files but viewing them in Erdas Imagine. I need information about the header and can't find it anywhere. There is an example of my header information below. Can anyone tell me what each of the parameters mean? For instance, what is the 16 in projection info? Is there a place where I can find this info...I don't have a manual to look at. I have been able to figure out what map info means. I am having a problem reprojecting this info and would like to understand more about this projection information. (Sinusoidal to Geographic Lat./Lon) Thanks. map info = {Sin1km, 21600.5000, 10800.5000, 0.0000, 0.0000, 926.62543314, 926.62543314, , units=Meters} projection info = {16, 6371007.181, 0.000000, 0.0, 0.0, Sin1km, units=Meters} geo points = { 0.5000, 10800.5000, 0.00000000, -180.00000000, 21600.5000, 1200.5000, 80.00000000, 0.00000000, 42000.5000, 10800.5000, 0.00000000, 170.00000000, 21600.5000, 14400.5000, -30.00000000, 0.00000000}