I have just obtain some raw MTSAT data but when I tried to open it using ENVI it request that I fill in some header information. How do I get the information? Please advise.
You will have to ask the provider, at least the number of rows and columns of the imagery and the number of spectral bands as well, whether the imagery has been geometrically corrected and geographically registered. If you cannot answer the questions asked by ENVI when reading an unknown file format, including whether the file format is BSQ or BIL etcetera, you will never get those images decently on screen.