Application of digital techniques to generate a cartographic database of Córrego do Cabuçu de Baixo basin, São Paulo, SP, Brazil

Abstract

The use of appropriate cartography database is extremely important to support projects of planning and land management. However, the absence of maps, or the amount of obsolete maps, has been leading to the adoption of alternative methodologies aiming to faster and less onerous solutions for the development of cartography databases, without compromising quality. Regarding this problem, the present paper reports on the viability of constructing a cartographic database designed for applications in hydrology, more specifically, as a base for a Decision Support System for Urban Basin Management - DSSURM. The methodology combines techniques of manual terrain features extraction, as well as automatic techniques of photogrammetry. Digital orthophotos and contour maps were generated. The coarser 5 meters interval was used for the mountainous regions and forest, and the finer 1 meter interval for other regions, floodplains were prioritized for mapping flooding areas. The final analyses show the viability of the methodology as well as the high quality of the cartographic products.

Keywords

• digital terrain modeling
• orthophoto
• urban hydrology
• hydro resources management
• urban water