International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 Ini 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
precipitation and FPAR values was undertaken to identify the Uwe m. » Sort rt uy aduer E le: 
importance of local precipitation to changes in vegetation. 1e : cals 
dif 
go sh 
Total Precipitation Class Range (mm) lit 
Min Max m 
ex 
l 0 10 ap 
40 
2 10.01 20 ch 
3 20.01 30 e 
pr 
4 30.01 40 
, a Tal Th 
5 40.0 1 50 : ht Caen Tavers are Y Rao + . 7 e 7 Y us 
sede Pere dun VE I 4 ON En hd the 
6 50.01 60 ne 
7 60.01 70 co 
gr 
8 70.01 >70 ve 
an 
Table 1. Total Precipitation Classes ] wl 
l 
. . . . 5 | } 
To assess differences in vegetation response, a sample region x i [om Fu 
was selected for analysis in Northeastern New Mexico. The NS A FN § | to 
: Cusen ze | Pa a cs] 2 s 
selected sample corresponds to Grassland Area 2 shown in TR. dt ages” rel 
Figure 1. This area constitutes a sample of almost 32,000 1 km N { uU Im 
: : er bum |... | 
pixels in an area that is predominantly grassland. A difference ] jé ser Lame | en 
image for two FPAR 8-day composites (June 10^-16^ and June Y ] | ev 
17*-24") was calculated to identify those areas where there was kii T | str 
an identifiable vegetation response (Table 2). > | | gr 
- pee A Sy! 
Legend * [ LU 
: (€ \ pa 
Means Table for FPAR169-FPAR161 Mio m mic 
à B" 250 B 0 | a fmi E- aE | 
10000 Er |[NEXRAD 2092.180 8-Day Composite Jun 8-16 | x 
8.000 ; 
s Zh 
$ 6000 Nc 
3 4.000 Fri 
2.000 à Ve 
ooo LAL Nef d I uL e. Ba 
60 - 70 
mc 
Cell (Accum Rainfall mm) 
adul: My 
Table 2: Change in FPAR means by precipitation class. N. 
To further assess the extent of the vegetation change, a ratio Co 
image of the early June image divided by the late June image La 
was calculated. The resultant image and values show the Use 
location and percentage of change in the FPAR values (Table s 
3). Fe aom ara vn SE ; tias MER j SE E 
| arme ae a Me 
Means Table for FPAR161/FPAR169 pee Ce pr 0 n° s P (M 
Misc | MODIS FPAR.2002.169 8-Day Composite Jun 18-25 Do 
0.950 nib : Fli 
2 500 Figure 2: FPAR Images During (A) and After (C) 
1 1856 the Precipitation (B) 
= 0.800 
o 
0.750 ; 
070 3. RESULTS AND CONCLUSIONS 
  
  
  
  
  
  
«10 10-20 20-30 30-40 40-50 50-60 60-70 >70 
Cells (Accum Rainfall mm) 
The images show a generalized change that occurs Over the 
entire area of interest that is interpreted to be the result of 
seasonal vegetation greenup. An ANOVA of the NEXRAD and 
FPAR difference values reveals that there is some change 
FPAR values regardless of precipitation, representing à base 
Table 3: Percentage Change in FPAR means by precipitation 
class. 
908