International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
1.1 Image fusion 
The fusion of panchromatic with multispectral WorldView-2 
scenes was done using the Principal Components method, 
resulting in an image with 0.50 m spatial resolution. 
1.2 Orthorectification 
The orthorectification was made using the 3D rational 
polynomial method (TOUTIN, 2004) and the software package 
PCI Geomatics v10.3.1, considering 55 GCPs for the entire 
area under study. The GCPs used for the geometric 
rectification were obtained during a field campaign in August 
2011. 
1.3 InterIMAGE 
InterIMAGE is a knowledge-based free software for image 
interpretation. It was developed in the frame of a cooperation 
project between INPE, the Brazilian National Institute for 
Space Research, the Laboratory for Computer Vision of the 
Catholic University of Rio de Janeiro (PUC-RJ), and the 
Leibniz University of Hannover (Germany). According to 
COSTA et al. (2010), its knowledge structure, design and 
control mechanisms were inherited from the German system 
GeoAIDA (BUCKNER et al, 2001), which consists of a 
further development from AIDA (Automatic Image Data 
Analyzer). 
According to RIBEIRO (2010) the most important 
characteristics of InterIMAGE are its flexibility for the 
interpretation of multi-sensor images, the reduction of 
computer processing time and the load for the image analysis 
(Figure 2). 
The most recent version of InterIMAGE can be downloaded at 
link htip//vwww.ivc.ele.puc-rio.bi jects/interimage/. Among 
other operators for object extraction it contains: a segmenter 
from Baatz, the Checkerboard, a classifier by decision trees, an 
importer for vector files, topologic attributes which can be used 
at the decision rules of Top-Down and Bottom-Up operators 
(COSTA et al., 2010). 
external operators : | 
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f f | 
result 
  
  
  
  
Figure 2- Components of the analysis process. 
Source: Adapted from RIBEIRO (2010) 
2. AREA UNDER STUDY 
The area under study is part of the Maranhäo Island, NE 
Brazil, encompassing 831.7 Km? (Figure 3). 
At the northern section of Säo Luis municipality there are 
fragile geologic structures of Quaternary age, which eases 
landscape changes by relief modeling agents of climatic, 
hydrologic and oceanographic origin. A detailed description of 
this area is found in SOUZA & FEITOSA (2009) and GERCO 
(1998). 
  
  
  
  
  
  
  
  
  
Figure 3 — Localization of test site 
Source: Adapted from WorldView-2 image dated July 10^ 
2010. 
3. METHODOLOGY 
The main methodological steps are presented in the 
flow diagram at Figure 4: 
XS Images WV-II 
FUSION 
: 
Fused image 
Pan Image WV-II 
Control Points 
Field Survey ORTHORECTIFICATION 
to obtain GCPs for 
DGPS system v 
DEM Ortho-rectified 
Images 
NDVI 
SEGMENTATION 
CLASSIFICATION 
EVALUATION OF RESULTS 
LAND COVER MAP 
Figure 4 — Methodological steps 
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