Any specific questions? A general description is found on the ITT website:

http://www.ittvis.com/language/en-us/productsservices/envi.aspx

Their tutorials are here:

http://www.ittvis.com/language/en-us/productsservices/envi/tutorials.aspx

Ok, thank you very much Sr.

yes ok it's a good website but I need some more details about the detection of the geological materials ( sedimentry rocks and salt soils in satellite image ); the geological remote sensing.

You might want to find a copy of Remote Sensing Geology. A link to part of the book here:

http://books.google.com/books?hl=en&lr=&id=74T8X1zqgF4C&oi=fnd&pg=PA1&dq=remote+sensing+geology&ots=npL3dY4oDA&sig=oLI8XJsVUA_eykcCZSJ7vVsKmjE#v=onepage&q&f=false

This book is much cheaper online:

http://www.lavoisier.fr/livre/notice.asp?id=OR2W2KASLSOOWI

Otherwise you might find bits and pieces on the web:

http://rst.gsfc.nasa.gov/Sect2/Sect2_1.html

http://www.asdi.com/remote-sensing/applications/geology-and-mineral-analysis

All I know is that for most of your work you are going to have to use bands in the Near IR to Far IR or some other data like radar. Unfortunately my expertise is the VIS/NIR region since I work on water and vegetation. Good luck!

Thank you very much for all that informations

Please try Clarke labs. I have worked with Idrisi Kilimanjaro software and it is nice. Also try Erdas Imagine

thank you Sr