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terefice

Band Threshold to ROI on ENVI software

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hi dear friend i want to do Band  Threshold  to  ROI on ENVI software
how can i do it i read the  help of software but so don't understand how i do it
please send me an tutorial that i do it

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do you can do it on one  example . and and take pic for step by step  and send me for an tutorial.?

 i cant inderstand where i can get and determine min valu and max value to run thershulding of ROI.

i want do same this articale.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCYQFjAA&url=http%3A%2F%2Fgers.uprm.edu%2Fgeol6225%2Fpdfs%2Fl_montalvo.pdf&ei=7uD4UtW4OYWNtQad7YD4BA&usg=AFQjCNHUlpBxeyG0wzVY7WvusQ-kenYr2A&sig2=L85iBLnQYaGvFk6TWzRQQQ&bvm=bv.60983673,d.Yms

buot cant do step of band thershuldin.

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