PE&RS August 2014 - page 767

T
able
4. P
rincipal
C
omponents
S
elected
to
B
uild
PCR M
odels
of
C
rop
B
iomass
(A
lfalfa
, C
otton
, M
aize
,
and
R
ice
). T
he
C
omponents
are
B
ased
on
the
F
irst
D
erivative
T
ransformation
of
R
eflectance
. T
he
W
avelength
C
entroid
L
oadings
>|0.7|
are
H
ighlighted
for
E
ach
C
rop
.
Rice
Alfalfa
Cotton
Maize
Band Centers (nm) PCA1 PCA2 PCA1 PCA2 PCA1 PCA2 PCA1 PCA2 PCA3
428
0.89
0.78
438
0.87
0.78
448
0.86
0.73
458
0.87
468
0.87
478
0.87
489
0.83
499
0.75
0.71
0.72
509
0.88
550
0.83
0.75
560
0.82
0.88
570
0.82
580
0.84
590
0.87
0.89
600
0.88
611
0.86
621
0.87
631
0.85
0.77
641
0.76
0.87
651
0.80
661
0.83
0.90
672
0.86
692
0.80
702
0.92
722 0.74
733
0.70
743
0.80
753
0.85
763
0.89
773
0.85
783
0.79
794
0.73
804
0.89 0.95
814
0.83
824 0.77
0.81
845
0.89
855
0.94
865
0.90
916
0.80
943
0.76
0.90
0.90
953
0.83
0.83
0.92
963
0.72
0.84
0.81
993
0.71
1013
0.90
1023
0.92
1084
0.71
1094
0.79
1124
0.82 0.84
0.91
1134
0.84 0.87
0.94
1145
0.84 0.84
0.94
1155
0.82 0.83
0.83
1175
0.83 0.74
0.79
1185
0.82 0.78
0.79
1205 0.82
1215 0.75
1225 0.72
1235
0.70
1276
0.72 0.76
1286
0.77 0.78
0.91
1296
0.81 0.74
0.92
1306
0.82 0.71
0.87
1316
0.82 0.71
0.87
1326
0.81 0.70 0.71 0.83
1336
0.80
0.71 0.80
1346
0.77
0.74
1538
0.92
1548
0.91
1558
0.89
1568
0.88
1578
0.89
1588 0.91
0.88
1599 0.92
0.88
1609 0.92
0.86
1619 0.90
0.85
1629 0.89
0.84
1639 0.86
0.82
1649 0.74
1689
0.79
-0.70
1699
0.80
-0.76
1710
0.82
-0.79
1720
0.93
-0.82
1740
0.75
0.95
1750
0.72
0.95
-0.82
1760
0.74
0.95
-0.84
1770
0.74
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
August 2014
767
691...,757,758,759,760,761,762,763,764,765,766 768,769,770,771,772,773,774,775,776,777,...814
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