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In recent years, the use of advanced delineation GIS data (ADGD) has become invaluable in studies that require accurate spatial distribution of land use. However, the preparation of ADGD, especially for urban catchment areas, is often tedious, time consuming and prone to errors, since these are mostly constructed manually using a digitized map. In this study, a computer algorithm (automated construction algorithm) was developed to automatically construct ADGD from a digitized 1:2500 topological map, using only geographical point features and geographic object boundaries that have land use attributes. A portion of the digitized map of the Kanda River basin was used to examine the accuracy of the newly developed algorithm. Evidences show that this algorithm can generate similar to more accurate geographical features when compared with the manual approach. The automated construction algorithm, thus, provide an accurate and efficient alternative in constructing ADGD, which can benefit future GIS-related studies.

DEVELOPMENT OF AN AUTOMATED CONSTRUCTION ALGORITHM OF ADVANCED DELINEATION GIS DATA USING 1:2500 TOPOLOGICAL MAP