The BLIS group in the BMA is looking at new techniques to capture data for input to GIS. This includes the use of raster images and other techniques to estimate attribute data such as population (Webster, 1996). Automatic conversion of raster data to vector data has not proved to be reliable. A trial scanning of a 1:4000 map of Bangkok showed that about 30% of the buildings did not appear as closed polygons. Much touch-up work was required. However, scanning is a quick solution for the overall view of the terrain and a broad coverage of an occurrence, such as a flood. New technologies in which resolution and ease of interpretation of remotely sensed and scanned images are emerging will broaden the applicability of these technologies (Mason et al., 1997).