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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
Some authors, to relate the parameters of the vegetation with
the IVDN, or secular series of the index, had beyond pointed
the importance of the quantification of the not structural
parameters of the vegetation in the studies of ecological
(Cihlar et al, 1991; Sellers et al, 1994;
Chimitdorzhiev & Efremenko, 2000).
Processes
Since the first works of correlation of the parameters of the
vegetation with the IVDN, the influence of the seasonal
variations always it was considered. Generally, the authors use
sensors high temporal resolution and low space resolution. In
these works they are identified, in continental areas. the
temporal variation of the IVDN (Tucker, 1986; He executes ef
al.. 1991; Reed et al. 1994; Batista er al., 1997; Huete et al.
2002). In other cases, this seasonal variation of the IVDN is
associated the parameters of the climate as the pluvial
precipitation in African savannahs (Fuller & Prince, 1996) and
in the Brazilian campo cerrado (Franca & Setzer, 1998). In
some cases, the sazonais variations had been associates to the
variations of the vegetative fenologia of the vegetal covering,
for the determination of fenofases vegetative (Ludeke ef al.
1996; Duchemin ef a/., 1999).
In Brazil, specifically in the Open pasture, already studies had
been carried through relating the fenologia, with images IVDN
and rain regimen, in fisionomias of campo limpo, campo
cerrado (Franca & Setzer, 1998), cerrado stricto sensu and
cerradäo (Santos & Shimabukuro, 1993; Galvao ef al. 1999). or
considering all the physiognomic gradient (Bitencourt ef al.
1997, Mesquita Jr, 1998).
The objective of this work is to quantify the relation between
parameters of the structure of the fisionomias of Cerrado and
images of orbital sensors. The decurrent limitations of the
temporal and space variations will be considered. In such a
way, 39 fixed parcels were sampled in the field land associeted
with satellites images of the Terra-MODIS, Landsat-TM
(30x30m), Terra-ASTER (15x15m), Ikonos-Multispectral
(4x4m).
2. MATERIALS & METHODS
2.1 Study site
The study site was located in the Pe-de-Gigante (21037'30" S,
47037'30" W), part of Vassununga state park, in Sáo Paulo
state, Brazil (fig. 2). The altitude in the area varies from 590 to
720 meters, with average altitude of 675m and with 1225 ha of
area, The predominance is of plain lands, with the situated parts
Steepest in the hillsides, in the limit of the microbasin of
draining.
The Pé-de-Gigante is constituted by a gradient of fisionomias
from campo cerrado (grass type) to cerradào (forest type). This
configuration of physiognomic gradient was presented by
Coutinho (1978), a part of the concept of Cerrado vegetation.
395
Figure 1. Säo Paulo state location in the South america, dark
areas represent the Cerrado domain in Sao Paulo.
2.2 Methods
Inside of the study area, 39 fixed parcels were installed, diposed
in 3 transects of 390 meters with 13 parcels of 30x30 meters
each (fig. 2). The transects were apropriated located on a
gradient of fisionomias, from campo cerrado (grassy) to
cerradäo (forest). On this sample plots
parameters of the vegetation were colected.
fitossociological
3 24 LA. ^r
4 AN RATES LII LIT LA
T6 ES ES AS BE HAST E US OE a S
PE INGE TE FC BCA
ER La
A
Figure 2. Position of the sample plots in the field over a 3D
representition of the relief.
The initial point was found with the aid of GPS (UTM 23K,
227402E, 7605144N) had been transferred to a landmark of
concrete in the place. From this point, from East was traced a
line straight line in the direction to West, in relation to the
geographic north.
Eleven images had been used for the calculation of the IVDN of
the study area, being nine of the Landsat-TM, an image of the
