inbul 2004 
within the 
ted. These 
e of wood 
1icrowaves 
tenna and, 
th surface. 
€ received 
re usually 
‚erted into 
lues were 
ist, 1997; 
| energy 
idered in 
or, defined 
tion factor 
nterval are 
te interval 
:d. Source: 
actor (dB) 
formed in 
d in the 22 
btained by 
ages were 
al. (1999). 
processing 
0 polygons 
1993), the 
DIS NDVI 
> following 
and ENVI 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
Figure 2 - JERS-I/SAR Images windows of the 22 priority 
zones visited during the BIOTA-Cerrado project, with a 
12.5 meters spatial resolution. 
3. RESULTADOS 
The JERS-1 o values from JERS-1/SAR images were 
extracted using the map of physiognomies, described by 
Mesquita Jr (1998), and the results are presented in Figure 3. 
The range found was around -6 dB to -12 dB, covering all 
Cerrado physiognomies found in the pilot area. 
  
  
  
  
  
  
  
  
  
: 3 3 ; 3 
gg £3 3 3 3 a 
£°E t E È c E 
© £ TQ ü D o w 
O02 oo O e Ö T 
ui 
0 A 
2 
x4 
5 
n -B e 
0 € e 
8 e 
-10 e 
12 
Physiognomies 
Figure 3 — Diagram of 6 values of the Cerrado physiognomies 
and Seasonal Semideciduous Forest within the Pé-de- 
Gigante. 
Generally speaking, the results obtained in this pilot area 
are similar to those obtained by Santos et al. (1998 and 2002) 
and Luckman et al. (1999). 
The Figure 4 shows the relation of the NDVI values 
(ranging form 0.6 to 0.9) with c values (ranging from —14 dB to 
—7 dB) for all 206 remnents studied. The dispersion of those 
plots are bigger than expected requiring further analysis that 
should take into account the topography effects. It is clear that 
the concentration of remnants with higher NDVI and higher 
values indicates the predominance of dense physiognomies. 
547 
  
  
  
  
  
  
  
  
  
  
-7 
o 
Q : e 8 o n e 
obe BELLO i + + 
OC 9990 0 no © 
a. 2 E cu Foust as ne 
-0 5 a tH na, to 25 f 
a oq y 
0° 44° 02 os pud 2 
-10 0 T ms 2 t 
EEG p 
g o ^o o % 
Li e o Q o p 
-12 
o 
-13 0 
o 
-14 T T TY T T 
0.6 0.65 0.7 0.75 0.8 0.85 0.9 
NDVI 
Figure 4 —Graph of the dispersion of the average values of 
NDVI (Terra-MODIS) and c values of each Cerrado 
fragment. 
Considering that the MODIS NDVI values are corrected 
in terms of atmospheric effects and the o values of the SAR 
images are properly pre-processed, the points concentration at 
the right top of the graphic suggest that most of the remnants 
studied present dense vegetation physiognomies. 
Comparing the o values obtained from all 206 remnants, 
within the 22 priority zones the results are: zones G, F, S, C, D, 
Q, Z, U, and R presented higher backcattering dispersion 
spectrum (from —14 dB to —7 dB); and the zones B, N, L, A, I, 
Jj, M, T, F, H, O; V, K, and P presented lesser dispersion 
spectrum (-11 dB to —7 dB). 
Figure 5 shows the location of each FPZ studied and 
Figure 6 shows the analyses done of each remnant inside each 
FPZ. The results from field observation MODIS NDVI 
analyses and JERS-1 image analyses showed the predominance 
of dense type of vegetation within the majority of the remnants. 
wt var ee —. t wa wer war mar 
+ . r = + 
w LA as a» T * 
fr : 3 { 
f rmn m V K T E 
x oy ty / 
+ £0 A * Ww + Y * * 
Y x-M N t P 
c F j DO“ m 
7 A à ^ < id P > d 
f. iL 
J + P * *— EE so v + } + 4 
Pe f 25 & Sr 
P D u” 5 e b | A. a 
fo rA ca BF Re l x4 V. Vv 
+ SA Pe ae 7 e Lv ed 
: T y * * Fin, eK 7 + f. 
“ pa 
A US 
* * * i d HE ruf + + 
25 j tt 
A 
/ P af 
— i 
"d 
+ + + + + Im + y^ + + + 
Figure 5 — The location of the 22 FPZ within the whole state, 
comprising 206 Cerrado remnants located in the 22 
priority zones.