Aerial survey to produce 3D flood, hazard maps
posted 23-Feb-2017  ·  
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AERIAL SURVEYS. were conducted by a team from DOST and a UP training center recently in Catanduanes using a single engine plane equipped with LiDAR sensor equipment. The survey will produce 3D flooding and hazard maps as well as resource maps for local planners. Here, Virac Mayor Samuel Laynes poses with team members at Virac airport. The LGU hosted the team during their 10-day stay on the island.

A recently-conducted aerial survey of the island by a team from the Department of Science and Technology (DOST) and the University of the Philippines Training Center for Applied Geodesy and Photogrammetry (UP TCAGP) is part of a program aimed at producing three-dimensional flood and hazard maps for majority of the country’s river systems.

The team arrived in the 2nd week of February and, following the arrival of a Cessna T206H aircraft equipped with a sensor of Light Detection and Ranging (LiDAR) equipment, began conducting survey missions in the target priority areas in Catanduanes. Among the LiDAR coverage areas here are the coastal areas stretching from San Andres to Virac and along the eastern coast towards Pandan, as well as the vast nipa swampland straddling the boundary between Panganiban and Viga.

Composing the team were senior science research specialist Pearl Mars, research associates For. Regina Felismino, Jonalyn Gonzales, and Engr. Brylle de Castro, and airborne security TSgt. Lee Jay Punzalan.

The Phil-LiDAR 1 project is an expansion of the Disaster Risk Exposure and Assessment for Mitigation (DREAM) Program, which seeks to tap state colleges and universities and other higher educational institutions nationwide in the processing and validation components of the program,. Aside from addressing disaster risk reduction and climate change adaptation, the resource information to be generated by the project will be useful in providing the information requirements for various sectors in the country.

On the other hand, the Phil-LiDAR 2 Program aims to produce detailed resource maps for various applications, including production of high value crops irrigation assessment, aquaculture production, forest protection, and discovery of renewable energy resources. In Bicol, the Ateneo de Naga University is the program partner.

In Catanduanes, the LiDAR data acquisition survey missions were conducted between 5 A.M. to 5:30 P.M. over several days depending on the cloud cover and weather condition in the survey area, with the plane flying at an altitude of 600 to 1,500 meters for each mission that lasted 3-4 hours. The survey team also established two GPS stations within the 30-kilometer radius of the survey area to provide geographic reference. The project is using four aircraft in the surveys.

The data gathered will be used ti produce an up-to-date and detailed national elevation dataset suitable for 1:5,000 scale mapping, with 50 cm and 20 cm horizontal and vertical accuracies, respectively. The airborne LIDAR systems reportedly collect point cloud data at a rate of 100,000 to 500,000 points per second, and are capable of collecting elevation at a rate of 300 to 400 square kilometers per day, per aircraft.

“The life-saving information produced by the program aims to aid planners and local government units to prepare for and propose countermeasures for the pronounced probable La Niña occurrence this year,” project leader Engr. Louie Balicanta told Mayor Samuel Laynes.

The municipal government provided coordination, accommodation and transportation service for the team while they were in the capital town.

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