University of the Philippines Training Center for Applied Geodesy and Photogrammetry (UP TCAGP)

National Mapping and Resource Information Authority (NAMRIA)

The Future of Positioning in the Philippine Modernization of Philippine Geodetic Reference System

May 26, 2017Dusit Thani Manila

1

Overview Objectives Data Methodology Initial Results Issues and Challenges Team Composition

2

3

4

5

http://itrf.ensg.ign.fr/ITRF_solutions/2008/ITRF2008.php

6http://www.iprpi.rpi.edu/IPRPI%20publications/2007/Mccaffrey_analysis_2007.pdf

Galgana, et. al, 2007

As part of the NAMRIA’s Strategic Plan to help create a geospatially empowered Philippines by 2020, UP TCAGP, though a Memorandum of Agreement with NAMRIA, is tasked to conduct a research study in support of the PGRS Modernization. This is composed of 2 research topics.

7

Research Topics

Selection of Most Applicable Datum Transformation Scheme from Local (PRS92) to Geocentric (ITRF2008) Datum

Evaluation and Assessment on the Effects of Shifting the Existing Cadastre to Geocentric Datum

8

9

Research Motivation Integrity of PRS92 control network (established 20

years ago) is affected by earthquakes and crustal movement (2-3cm/yr - Phivolcs) Coordinates of control points is becoming

increasingly inconsistent with real world positions. Increase in demand for a global geodetic

reference frame (GGRF) Further development of positioning technologies

(GNSS) for accurate definition, utilization and connection to GGRF is also observed.

Main objective: To determine the most applicable datum

transformation scheme from local to geocentric datum.

Specific objectives: Analysis of geodetic control stability. Derivation of transformation parameters in the

national, regional, provincial, tectonic block boundary and municipal/cadastral levels.

Accuracy analysis of transformed positions with tectonic velocity consideration.

Computer programming and web page development

10

Data Gathered 62933 GCPs in PRS 92 2862 GCPs in ITRF2008 Regional boundaries Provincial boundaries Municipal boundaries

11

Study Areas Target study areas

in Luzon Region 3, CAR

Target study areas in Visayas Cebu, Bohol

Target study areas in Mindanao None to date

12

13

METHODOLOGY

PMG-60PMG-70PMG-72PMG-75PMG-100PMG-103PMG-3189PMG-3235PMG-4347PMG-4390PMG-4545PMG-4579PMG-4592PMG-4594

Initial Results

14 points used for transformation

14

Pampanga Transformation

Results of Pampanga Transformation Transformation Parameters and Residuals of GCPs used

Residuals:Point X res Y res Z resPMG-100 0.1880 -0.3370 -0.0850PMG-103 0.0160 -0.0530 -0.0100PMG-3189 0.1300 -0.2450 -0.1200PMG-3235 0.2510 -0.0630 0.0640PMG-4347 0.0330 -0.0470 -0.0760PMG-4390 -0.4920 0.7670 0.0280PMG-4545 0.0340 -0.0640 0.0030PMG-4579 0.0190 -0.1030 0.0430PMG-4594 -0.0120 0.0000 0.0220PMG-60 0.0300 0.0170 -0.0160PMG-70 -0.1000 0.0650 0.0490PMG-72 -0.0820 0.0330 0.0600PMG-75 0.0040 0.0140 -0.0030PMG-4592 -0.0200 0.0160 0.0400

Parameters Value

Scale 1.00000

Omega -0.0018d

Phi 0.0008d

Kappa 0.0005d

Tx -96.788

Ty -98.230

Tz 77.397

15

Results of Pampanga Transformation

Transformation ResultsID dX dY dZ R

PFLO -0.00757 0.92383 -0.04419 0.92491PMG-104 -0.03271 0.11068 0.02767 0.11868PMG-3069 0.02609 0.26098 1.05536 1.08746PMG-3136 -0.06447 -0.27000 0.58540 0.64788PMG-3144 0.36234 -0.35768 0.20214 0.54780PMG-3247 -0.45264 -0.08071 0.23661 0.51709PMG-3252 -0.31353 -0.59376 0.34182 0.75345PMG-3268 -0.50615 -0.07373 -0.30211 0.59405PMG-4070 1.20850 1.11609 -0.22365 1.66017PMG-4071 1.21763 1.11552 -0.21774 1.66566PMG-4110 -0.77204 2.10446 1.42343 2.65536PMG-4130 -1.91455 3.99910 2.06909 4.89280PMG-4165 1.71844 -2.54555 -0.18495 3.07686PMG-4181 -0.99253 2.28377 1.48632 2.89998PMG-4197 -0.08003 0.70161 0.94758 1.18176PMG-4199 1.40008 -2.00282 0.02075 2.44376PMG-4202 0.41525 -0.30117 0.63260 0.81444PMG-4207 1.39331 -2.15023 0.01068 2.56221PMG-4229 1.16656 -1.64015 0.14481 2.01790PMG-4391 0.32518 -0.46964 0.12480 0.58470PMG-4433 -0.18554 -0.39043 0.60231 0.74138PMG-64 -0.15513 0.16580 0.09600 0.24651PMG-69 0.09261 -0.03717 -0.00188 0.09981PMG-73 0.08715 0.01768 -0.01102 0.08961

Min 0.08961

Max 4.89280

Ave 1.34726

RMSE 1.77462

Re-observations needed on points with large residuals.

16

Results of Pampanga Transformation

Distribution of Residuals

17

Issues and Challenges GCP distribution throughout the region is

insufficient There are stations in Pampanga with same

station IDs but on different locationsPMG-4504 -117.76774 -45.95529 -82.82254 151.13140

PMG-65 -1490.67188 -940.55200 59.53826 1763.60016

PMG-66 -3586.59531 -2558.57037 1360.93225 4611.08283

PMG-67 -6105.56445 -3042.27758 -2722.89473 7344.89795

PMG-68 -1860.26759 -1821.35255 1898.80150 3222.32334

PMG-76 -12315.78540 -5110.65816 -7149.4138315129.82204

PMG-78 2150.85453 12065.04895-34637.8577136741.97556

PMG-86 -11378.28847 -1635.97091-16739.0427420306.09271 18

SIGNIFICANCE:

19

• Modernization of the Philippine Geodetic Reference System thatincludes initiatives to shift from a geodetic system (PRS ‘92) to ageocentric system (PGD 2020). This implies that all maps and mappingactivities including cadastral data shall be in the geocentric system.

• However, changes in cadastral information has legal implications:”In case there is an error on the title or a need to correct or ammend anyinformation in the title including the technical description, a petition forcorrection or rectification in court is needed in accordance with Section108 of PD 1529 (Peña, Peña Jr. and Peña Jr. 1994).”

• There is a need to quantify the changes in the cadastral data to provideproper recommendations for possible ammendments to land policiesbecause of the changes.

Main Objectives:

To understand the implications ofmigrating to a geocentric datum andsemi-dynamic system;

To recommend transformationstrategy in relating the old system(PRS92) to the new (PGRS2020) .

20

21

Provide a means of regenerating cadastral data into the geocentric system and semi-dynamic system

Compare and analyze changes in the cadastral data in the geodetic system and geocentric system in terms of: Position (coordinates)

Azimuth/ Bearing (Direction)

Distance

Computed Land Area

Computer Application Development

Provide recommendations

Dataset per Region

LMB NAMRIA

CAR *

NCR

1 ***

2 *

3

4A

4B *

5 *

6 ***

7 *

8

9 *

10

11

12 *

13 **

ARMM

22

Dataset from LMB and NAMRIA

Available Data per RegionUnavailable Data

* RTK GPS observations only ** Data obtained using Transit or TS***Data with Static GPS Observation

Selected Provinces depending on the availability of complete data Region II – Isabela and Batanes Region III – Bulacan and Pampanga Region IV-A – Laguna (or any province with

complete data) Region IV-B – Marinduque Region VI –Aklan Region VII – Bohol Region VIII – Leyte Region X –Camiguin Region XI – Davao Region XIII – Surigao

23

To date:Static GPS Data from NAMRIA and DENR Regional Office with corresponding cadastral data

Camiguin Bohol Davao Oriental

24

21

Data Gathering, Review of Related Literature

Site Selection, Recommendation for additional data needed in the

analysis

Least Square Analysis to obtain local transformation Parameters

Extraction of Cadastral Data Needed to Provide Local Transformation to Geocentric System

PRS92, Old Luzon 1911, Local Coordinates vs. WGS84, ITRF Coordinates of Tie Points

PRS92, Old Luzon 1911, Local Coordinates vs. WGS84, ITRF Coordinates of Common Points

PRS92, Old Luzon 1911, Local Coordinates vs. WGS84, ITRF Coordinates of points

extracted from imageries

Re-plotting of Cadastral lots in WGS84, ITRF

Quantification of changes in position, direction, distance and

area

Provide Recommendations

METHODOLOGY

Transformation Script Development and Testing Develop a script solving for 4 parameter

transformation Calibrate the script by inputting data with

known 4 parameters Implement script in a sample area Solve the 4

parameters for the area Assess changes in distances, bearings, area.

Sample Data: Mogpog MarinduqueOld System vs. New System

Sample Data: Mogpog Marinduque

Implementation: Mambajao, Camiguin Input data for finding the 4 Parameters

Residuals

Implementation: Mambajao, Camiguin

Checking: Lot 6903 (large parcel)

Observation: Change in Dimension

Observation: Change in Dimension

Checking: Lot 4459 (small parcel)

Observation: Change in Dimension

Next Activities:- PRS92 cadastral data to ITRF2008- Assessment of the Effect

Issues and Challenges- Accuracy of available data- Availability of GNSS Static Data for old

control points (related to old cadastre)

Rosalie Reyes, Dr. Eng. Wilfredo Rada Danica Noveloso

Louie P. Balicanta Bienvenido Carcellar III Raquel Raiza Francisco

37

38