June 2014
Intermediate to advanced
576 pages
16h 43m
English
book
Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
by Morton J. Canty
Content preview from Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition
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6 Images, Arrays, and Matrices
Listing 1.1: Reading and displaying a multispectral image in ENVI/IDL.
1 PRO E X1_1
2
3 envi_select , ti tle = ’ Ch oose mul tispec tral i mage ’, $
4 fid = fid , dims = dims , pos = pos
5 IF ( fid EQ -1) THEN BEGI N
6 PRINT , ’ canc elled ’
7 RETU RN
8 ENDIF
9
10 envi _file_ query , fid , fname = fnam e
11
12 ; i mage dimension s
13 cols = dims [2] - dims [1]+ 1
14 rows = dims [4] - dims [3]+ 1
15 band s = n_el ements ( pos )
16
17 ; BSQ array
18 mage = fltarr ( cols , rows , band s )
19
20 FOR i =0 , bands -1 DO im age [* ,* , i ] = $
21 envi_get_da ta ( fid = fid , dims =dims , pos = pos [ i])
22
23 ; disp lay fir st band
24 w
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