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Philippine hydrological dataset mapping in batangas province using lidar data and distance validation using laser range finder

Abstract:

The Philippines experiences at least 20 typhoons that causes flood to cities every year. Areas near the body of water are mostly populated which became more vulnerable when a disaster strikes. Disaster monitoring and management plays a critical role in disaster mitigation. Remote sensing and GIS has been widely used to manage and identify hazard areas. Most approach to automatically creating a hydrologic model is using the geometric neighboring features. The Philippine Hydrologic Dataset for Watersheds from LiDAR Assessment (PHD) is one of the five components of the Nationwide Detailed Resources Assessment using LiDAR (Phil-LiDAR 2) to build a nationwide database for the Philippines to have a standard hydrological datasets such as streams, irrigation, wetlands, and watershed boundary. However, accuracy can be affected by spatial resolution of image and the classification method. This study present procedures in delineating three types of water bodies which are vital in urban planning such as: stream network, irrigations, and wetlands from LiDAR surveys. Acquisition of ground truth data using laser range finder done using SF-11c laser sensor connected to the Gizduino 4.1 microcontroller is also applied to validate the width from LiDAR data and actual feature using two tailed equal variance t test. Experiments compared the width of the classified objects from automated extraction using LiDAR Digital Elevation Model data versus ground truth using manual measurement as well as the ground truth data acquired using Gizduino 4.1 microcontroller versus the ground truth. Results show that the average values taken using the prototype and the Lidar have no significant difference in comparison to the actual measured data.