It is agreed upon that topological relations ore of great importance regarding to GIS data sets consistency. A lot of errors that can be found in GIS data sets are coming from a lack of knowledge about topological relations between the geographical objects stored in the database. Consequently, topology can help to find errors in GIS data sets, and can help to correct them. The topic of this pap...

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T. J. Matthews ([email protected]), H. E. W. Cottee Jones and R. J. Whittaker, Conservation Biogeography and Macroecology Programme, School of Geography and the Environment, Univ. of Oxford, South Parks Road, Oxford, OX1 3QY, UK. TJM also at: CE3C – Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Univ. dos A ç ores –Depto de Ci ê ncias Agr á ri...

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