Full text: XIXth congress (Part B7,1)

  
  
Daoud Brikci, Hichem 
  
COMBINING GEOGRAPHICAL INFORMATION SYSTEM 
AND MULTICRITERIA EVALUATION TO DEAL WITH LAND USE PROBLEM. 
Hichem DAOUD BRIKCI, M. Abdelhak TRACHE 
Geomatic Laboratory, 
National Centre of Spatial Techniques, BP 13, 31200, Arzew, Algeria 
Phone: +213 6 47 22 17, Fax: +213 6 47 34 54, dbhichem@usa.net 
KEY WORDS: GIS, MCE, Land Use. 
ABSTRACT 
The geographical information systems (GIS) provide the decision-maker with a powerful set of tools for the 
manipulation and analysis of spatial information. The functionality of GIS is, however, limited to certain deterministic 
analyses in key application areas such as spatial search. 
Land suitability evaluation has to face two major difficulties. First, there is a huge number of alternatives because each 
different coordinate is a possible solution (raster representation). Second, the decision making process is generally 
based on different criteria, which can be defined on a quantitative or a qualitative scale. 
Multicriteria evaluation (MCE) is one of the solutions for such complex choices situations as they appear in land 
suitability evaluation and territory management. The integration of multicriteria methods with GIS is forwarded as 
providing the user with the means to evaluate various alternatives on the basis of multiple and conflicting criteria and 
objectives. 
This paper explore the possibility of improving communication between land use and decision makers, using an 
interactive system combining GIS and multicriteria methods. An example application based on the search for the best 
1000 hectares of industrial land in Nakuru (Kenya) using IDRISI (raster GIS) and ELECTRE (MCE methods) is 
included. 
The finality of our study is to compare results obtained from the classic approach (without multicriteria analysis) and 
those obtained from the approach combining SIG and MCE. 
RESUME 
Les systèmes d'information géographique (SIG) fournissent au décideur des outils puissants de manipulation et 
d'analyse des données spatiales. 
Cependant, les fonctionnalités qui y sont implantées se limitent à de simples analyses de type déterministique. Les 
problèmes relatifs au territoire impliquent, généralement, plusieures actions où chacune peut répondre aux objectifs 
fixés et où chacune a ses propres coûts et conséquenses qu'il s'agit d'évaluer. 
L'évaluation de l'adéquation du sol à un usage donné doit faire face à deux difficultés majeures. Le grand nombre 
d'alternatives possibles, car chaque position est une solution potentielle (représentation matricielle). Le processus de 
prise de décision est en général basé sur différents critères, lesquels peuvent se rapporter à des échelles qualitatives ou 
quantitatives. Dans ce contexte, ce papier explore la possibilité d'améliorer l'interface décideur/utilisation du sol en 
utilisant un system interactive combinant les potentialités du SIG et les techniques d'analyse multicritére. 
Un exemple d'application concernant la recherche de sites convenant à l'irrigation dans la région de Tlemcen (Algérie) 
est présenté, en utilisant les potentialités du SIG IDRISI et les méthodes multicritères ELECTRE. 
Le potentiel d'intégration SIG-ELECTRE constitue une voie intéressante pour faire évoluer les SIG vers de véritables 
systèmes d'aide à la décision à référence spatial (SADRS). 
1 INTRODUCTION 
Until now, the spatial decision making and the integration of multicriteria into a GIS are less used. The most significant 
work in this field was that of Eastman and al. [1993] which provide the new version of IDRISI GIS 4.1 by a decision 
support analytical ring. It includes multicriteria evaluation based on the weighted sum using Analytical Hierarchy 
Process methods. It is the only one which includes analytical rings of decision aid especially the multicriteria analysis. 
[R. Eastman and al, 1993], [pereira and Duckstein, 1993] and [Vidal et al. 1994] integrated full aggregated 
multicriteria procedures into a raster GIS. 
  
306 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.
	        
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