1.開啟aug_25_2007.img和oct_07_2002.img映象檔案---oct_07_2002.img load true color----aug_25_2007.img
load true color to -----transform---ndvi----選擇oct_07_2002.img------ok----ok
2.ndvi(oct_07_2002.img)----load rgb band to new display---關閉#3----#1 overlay---region interest----options----bands threshold to rois---ndvi(oct_07_2002.img)---ok---
min thresh value:0.2 roi name:森林----hide rois---show rois---ok是---選擇region #1---delete rois---file---subset data via rois ---選擇oct_07_2002.img----ok----select
all item -----mask pixels output of roi:yes---輸出路徑----ok-----new display---選擇波段321----load rgb
3.file---subset data via rois ---選擇oct_25_2002.img----ok----select all item -----mask pixels output of roi:yes---輸出路徑----ok-----new display---選擇波段321----load
rgb---load true color to
4.spectral--- spear tools---change detection----select time #1 file----ok---ok---select time #2 file----ok---ok----select output root name---next---images already co-
band to new display
5.森林等級的劃分:enhance----interactive stretching---調圖----overlay----density slice---ok----clear
via rois --選擇檔案----
select all items----yes----ok