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The Philippine Geoportal Project intends to hold and serve to the participating stakeholders all the base maps that NAMRIA produces and eventually all the fundamental and thematic datasets of the other data producing agencies. It will promote participation of various data producers and other stakeholders in terms of providing location and attribute information. The build-up of data content and Development of other GIS based applications will also be done in the succeeding phases of the Project.
Philippine Geoportal System. Geoportal is used to find and access geospatial data and services. The Philippine Geoportal also advocates the use of standard multiscale basemaps that serve as tools for strategic planning, decision making, situational analysis and other common requirements.
You may visit the Philippine Geoportal here.
The Philippine Extended Continental Shelf Delimitation Project is geared towards meeting the United Nations' Commission on the Limits of the Continental Shelf (UNCLCS) guidelines for delineating the outer limits of the Philippines continental shelf. It will use a data set that will combine historical bathymetric, geological and geophysical data with similar data collected specifically for the Philippines' Extended Continental Shelf Project. These data and information will be the country's bases to claim maritime jurisdiction over seabed areas and its resources beyond 200M from the baselines from which the breadth of the territorial sea is measured.
The project also covered the diplomatic component of the Philippines submission which includes coordination with neighboring States and eventual technical defense before the UNCLCS.
The Philippine ECS in the Benham Rise Region. On April 12, 2012 the Commission on the Limits of the Continental Shelf (CLCS) of the United Nations adopted in full the Republic of the Philippines’ Submission for an extended continental shelf (ECS) in the Benham Rise Region. The ECS is that part of the seabed that extends beyond 200 nautical miles from the country’s baselines. The outer limits of the ECS, as established on the basis of the CLCS recommendations, are defined by 226 points, covering a seabed area of 135,506 square kilometers.
The Philippine Reference System (PRS) 92 serves as the country's standard reference system for all surveys and mapping activities. It also serves as the fundamental component of the country's spatial data infrastructure. The role of PRS92 is to provide the medium through which data sets that are used for planning and those generated through the implementation of the different multi-sectoral programs and projects can be inter-related geographically.
Geodetic Network Development. One of the components of PRS92 program is geodetic network development. It's main activity is the densification of the PRS92 network. The network is planning to expand this year. Below are the proposed regional network. Download the proposed network development by clicking the name of the region.
The Philippine Active Geodetic Network (PageNET) is a network of permanently-installed, continuously operating geodetic reference stations that utilize signals from Global Navigation Satellite Systems (GNSS) to provide real-time, high-precision geographic position data to users via the Internet. Data from the network may be used in a wide array of applications such as surveying, mapping, navigation, crustal deformation studies, and meteorology.
The PageNET is an important component of NAMRIA's strategic plan to modernize the national geodetic system by year 2020. It provides a continuous link to the International Terrestrial Reference Frame (ITRF) and is one of the Agency's contributions to the development of a sustainable global geodetic reference frame called for by the United Nations General Assembly through Resolution No. 69/266 of 26 February 2015 (A Global Geodetic Reference Frame for Sustainable Development).
Established in 2008, the PageNET currently comprises of 30 active geodetic stations installed nationwide. One of the three Tier 1 stations (PTAG) is already incorporated in the International GNSS Service (IGS) Tracking Network.
You may visit the PageNET website here.
Geoid model of the Philippines from airborne and surface gravity
A new preliminary geoid model for the Philippines has been computed from gravity data measured during the 2014 DTU-Space and NAMRIA/NGA airborne gravity survey, supplemented with marine satellite altimetry gravity data, NAMRIA 1st and 2nd order land gravity data, and data from the newest satellite gravity data from the GOCE mission (Release 5). Digital terrain models used in the computation process was based on 15" SRTM data.
The geoid model is a surface (N) which describes the theoretical height of the ocean and the zero-level surface on land. The geoid is required to obtain orthometric height H ("height above sea level;) from GPS by
where hGPS is the GPS ellipsoidal height, and H the levelled (orthometric) height.
The preliminary Philippine Geoid Model 2014 (PGM2014) ph_geoid.gri is computed in a global vertical reference system, shifted with a constant of +80 cm to approximate the average geoid offset relative to GPS and levelling in the Manila areas.
This geoid which has an accuracy of 0.30m can be an alternative to levelling in remote areas. It was made possible thru the assistance of Prof. Rene Forsberg and Arne Vestergaard Olesen of the National Space Institute, Technical University of Denmark (DTU-Space).
The PGM2014 is recomputed to become PGM2016 (and continuously updated whenever new land gravity data is added. The latest, PGM2018 used the new satellite gravity and altimetry data and the densified land gravity data, obtaining an accuracy of 1.2cm. It is available in gri format and three (3) models: a gravimetric geoid model, gravi-geoid2018.gri (applicable for scientific purposes and estimating elevation above the geoid surface); a mean sea level (MSL) fitted geoid (Hybrid), geoid2018.98_wgs84fit.gri and geoid2018.98_itrffit.gri for estimating elevations above the MSL. A ggf file format is also available for inclusion into Trimble Business Center Software (TBC).
A geoid interpolation program is made available for computing the geoid value (N) of any point nationwide; just enter the PRECISE ITRF geodetic coordinates (for gravimetric geoid); WGS84 and ITRF geodetic coordinates (for a MSL fitted geoid) of the desired point then subtract the computed N value to the ellipsoidal height of your point to get Orthometric height. A point file may also be entered for batch processing.
The PGM2018 will be continuously refined by densifying the land gravity data (up to 41,000) nationwide; recompute and fit to an adjusted level network for a new version until 2035.
This program computes for the geoid height value (N);
2) Enter the precise WGS84 (1987), or ITRF coordinates of the point;
Use the formula H = hgps - N to get Orthometric height.
Please take note that the accuracy of the Orthometric Height greatly depends on the accuracy of the 3D coordinates of the desired point. Ensure that the reference GCP has "updated coordinates" (tied to zero order or re-observed gcp 2010 or later); else the computed elevation may be inconsistent with the data due to geodynamics and advancement in technology.
You may follow the instructions and download the application here.
NOTE: precise means it is adjusted.