Back-sighting the history of Surveying
Last November 28- December 2, 2011, I had the chance to participate in a course for GPS data analysis and modelling (GDAM) for scientific and practical application workshop held at the National Engineering Center of UP Diliman. Part of the itinerary is a day of field trip to the major research agencies that uses Global Positioning Systems (GPS) in the modelling and analysis of crustal movements for their respective scientific applications. The agencies that we have visited are the Philippine Institute of Volcanology and Seismology (PHIVOLCS), Manila Observatory and the National Mapping and Resource Information Authority (NAMRIA). At PHIVOLCS we get a peek on how the GPS data from continuous and campaign sites have been archived, processed and delivered. These data will then be used further for the analysis of crustal movements specifically along the Philippune Fault as well as the deformation and movements on active volcanoes in the Philippines such as Mayon and Kanlaon. Having bee