-B8, 2012
ding Stage
HyMa
Wavelength (nm)
05. 750
000, 2100, 2200
680, 1754
86, 1546
30, 721, 1206, 1573,
726, 2100, 2277
MI wavelengths
45, 630
510, 1680
206, 1331
07, 764, 1047, 1220,
025, 2242
MI wavelength
94. 911
92, 764, 1047, 1330,
676, 2360
MI wavelength
65, 845
000, 2100, 2200
680, 1754
171, 2260
21, 911, 1206, 1586,
726, 2099, 2277
MI wavelengths
65, 845
65, 845
05, 750
00 ... 599
31, 570
I...
]
95. 760
000, 2100, 2200
680, 1754
044, 2393
d
4
s
64, 911, 2045, 2409
MI wavelength
65. 845
65, 845
05, 750
00 ... 599
31, 570
9
,
95. 760
000, 2100, 2200
680, 1754
30, 560
07, 911, 1047, 1206,
477, 2277
1 wavelengths
145. 630
510, 1680
36. 764
07, 764, 1047, 1220,
663, 2360
AI wavelengths
fficient of 0.6 or higher
:ontent rate, and
sture of the later
nformance, and
6).
sis Results
ater Grain Filling Stage
x(R?=0.31)
A(R’=0.59)
A(R>=0.54)
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
5,3 Estimation Accuracy Verification
For the grain weight, grain nitrogen content rate, ash content,
and head moisture, estimated values and actual measured values
were compared. In order to verify influences of soil texture
differences, comparison results were separately plotted based
on soil color (Figure 6). For example, the head moisture in a red
color soil area is usually low (approximately 10%), and the
growth speed is generally high. The magnitude relation of
quadrats was mostly replicated. At the same time, The grain
weight, grain nitrogen content rate, and ash content indicated
that the estimated values well corresponded to the actual
measured values. The determination coefficients for these items
were 0.66, 0.81, and 0.70 respectively. Indirect estimations
through the biomass, LAI, and SPAD values showed a good
degree of conformance. However, these indirect estimation
results did not exceed direct estimation results. For the grain
weight, grain nitrogen content rate, and ash content, relations
with soil color were not observed.
f
j 5 5 S
ie Li
| vie
E $ =
3? =
13 3 f
| 30 d
i3 3
| 3 al
3
| Ex i :
RR z
| : B E
7100 Red scil Red soil |:
3 md Yellow. eb ssi] :
0 1 —
i 0 40 20 9 40 90 1 2 3 4 5
i Estimated Valus (g) Estimated Value (9)
i
(a) Grain Weight (b) Grain Nitrogen Content Rate
| 3 50%
|
25 | za
i
g? | 3
HE Z 30%
ANE $
| 215 har
i |
| ë : | 2206
3
{ 1 | X 10s
Ï 805 Sot |
NE Yellow |
| c os =
Oi 05 115 105. 290508 | % 10% 20 3% 4x Sow
| Eastimated Value | Estimated Value (4)
(c) Ash Content (d) Head Moisture
Figure 6: Comparison Results of Estimated and Actual
Measured Values
5.4 Estimation Map Development
Estimation maps of the grain weight, grain nitrogen content rate,
and ash content were developed by applying the developed
estimation model to the entire HyMap data considering local
conditions of the study area. In the same manner, an estimation
map of the head moisture was also developed (Figure 7). The
estimation map corresponded to the distribution pattern of soil
color. The red color soil area indicated a low degree of head
moisture, while the yellow color soil area showed a high degree
of head moisture. To sum up, it is possible to visualize the
wheat yield, quality, and growth conditions on a regional scale
using the hyperspectral data of the heading and later grain
filling stages.
8840000
Legend
3 HS Quadrat
220000 330000 240000 350000
9 2500 5.500 10.600 Meters
(a) HyMap Imagery of Heading Stage
s +
Legend
6860000 pee zr
Sid
c
6860000
6850000
Mz
E Quadrat
LLL moo fis An
Paddock
Estimated Grain Weight (g)
220000 30000 340000
9 25005000 10,000 Meters
(b) Grain Weight
320000 330000 340000 350000
À
: :
|
i Legend i
pm Quadrat
[100 rraton Fit Acca
Paddock
2 Estimated Grain Nitrogen (M)
8 SI io 8
E] &
420000 330000 340000 350000
0 25005000 10.000 Meters
(c) Grain Nitrogen Content
