Development of Hydrologic Dataset from Lidar Surveys for Watersheds in Ilocos Norte

摘要

Ilocos Norte is one of the provinces in the Philippines which depends mainly on surface water for domestic, agricultural, and industrial water use especially for communities in mountainous areas. However, reliable information is critically lacking nowadays and inventories has been outdated throughout the province. Therefore, there is a need for alternative technologies to detailed hydrologic mapping. With the aim of developing a detailed and comprehensive hydrologic maps using Light Detection and Ranging (LIDAR) data, supplemented with other remotely-sensed imageries and ancillary information from LGUs and NGAs, the effectivity of implemented processing workflows was evaluated for 7 river basins in Ilocos Norte. Extraction of streams, wetlands and irrigation network in Cabungaan, Gabo, Cabayoagan, Natbaon, Pasuquin, NA-Pasuquin and San Mateo River Basins were done and their extents were determined. The effectivity of workflows in extracting features was evaluated using confusion matrix and reveals 98.13% accuracy. The versatility of the implemented workflows was demonstrated by its ability to be applied in other areas of the Philippines.