XXVIII, Part 7B 
In: Wagner W., Szekely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Part 7B 
hould be 
gital images with 
AT-TM and SPOT 
;re used for image 
;he study area, and 
ftogy, topography, 
rised classification 
CCLAS). Various 
essment to derive 
[ interpretation was 
tics, such as mean, 
; and co-variance 
• inspection of the 
leld work, finally 
md use/land cover 
tes at the Level II. 
essments of the 
A and SPOT image 
if known reference 
se and land cover 
:ed by supervised 
more than 85% in 
gram of ERDAS 
resulted into 11,11 
rea. Re-coding was 
on of land use and 
Field observations 
P- 
:edure 
ication 
Results and Discussions (Tables-l to 6 and Images 1 to 6) 
The tables 1, 3 and 5 present a summary for the maximum 
likelihood classification results of the three regions of northeastern 
Brazil. The overall classification accuracy for all the areas was 
found always more than 85%, which is good with respect to the 
classification categories used for this study. The classification 
shows that the percentage accuracy decreases as the level of 
detailed is increased. The more spectrally heterogenous areas 
also reduce the accuracy percentage of the classifications. The 
results of computer classification (Supervised Classification) of 
LANDSAT-TM and SPOT-2 Satellite data gained through various 
programs of ERDAS software into 15,17 and 12 mapping units. 
Table 1: Paraiba Land Use/Land Cover 
Table-2: Piaui Land Use/Land Cover 
^1 Deep to very deep water 
V2 Moderately deep to deep water 
V3 Very shallow to shallow water 
11 Dense Urban area 
12 Sparse Urban and barren rocky land 
IF 1 Cotton cultivated and fallow land 
1F1 Mixed cultivated and fallow land 
:P1 Mixed cultivated and Pasture 
il Alluvial land with dense shrubs/trees 
l2 Alluvial cultivated and eroded land 
1 Sparse Caatinga forest and rocky land 
2 Sparse to moderate Caatinga forest and rocky land 
3 Moderate to dense Caatinga forest 
4 Dense Caatinga forest on undulating land 
5 Dense Caatinga forest on hills 
^0: Deep clean water 
V1: Moderately deep water 
V2: Shallow silted water 
V3: Very shallow water or moist area 
FA: Swampy flooded area 
JO: Urban area with barren rocky land 
FA: Eroded flooded area 
DC: Poor drained cultivated with eroded land 
DC 1: Poor drained cultivated 
1C: Alluvial mixed cultivated 
J3: Cultivated river bed 
.B: Cultivated river bed with dense shrubs/vege. 
CD; Saline cultivated depression 
fERM: Weathered eroded rocky and moist land 
)CF : Dense Caatinga Forest 
1DCF: Mode. Caatinga forest on undulating relief 
PC: Sparse Caatinga forest on undulating relief 
I 
m- 
>È' 
Aiäfi 
». 
Wr' 
HC 
Test Areas 
tions 
ap 
Wj 
Figure 3 Paraiba Land Use/Land Cover Map 
Figure 4 Piaui Land Use/Land Cover Map 
Table-3: Ceara Land Use/Land Cover 
583 
W1 Deep to very deep water 
W2 Moderately deep to deep water 
W3 Shallow silted water 
W4 Shallow and polluted water 
U1 Urban area with rock outcrops 
Cl Cultivated nearly leveled land 
C2 Sparse to moderately cultivated undu. land 
A1 Alluvial moderately to dense cultivated land 
A2 Alluvial mode. culti.& eroded undu. land 
FI Dense Caatinga forest on hills 
F2 Mode.denseCaatinga forest on undu. relief 
F3 Sparse Caatinga forest on eroded undulating