Rosalie Reyes

• Doctor of Engineering
• Professor (Associate) at University of the Philippines System

There is a continuous decline of mangrove forests in the Philippines due to anthropogenic activities and natural disturbances. Through the years, monitoring of mangrove extent was done as part of the many local efforts to manage mangrove forests. However, existing mangrove cover estimates were generated by varied sources with different methodologie...

Sea level in the Philippine Sea is influenced by climate and oceanographic variables such as the El Niño Southern Oscillation (ENSO), North Equatorial Current bifurcation latitude (NBL), and sea surface temperature (SST). Tide gauges in the eastern Philippines, namely, San Vicente, Baler, Jose Panganiban, Guiuan, and Tandag were established in 2008...

The Philippines being an archipelagic country has the fifth longest coastline in the world. Its shores are defined by varying geologic form and composition that defines how sea water could impact its configuration. Being in a tectonically active setting, the country is also affected by ground motion. Specifically, the vertical land motion (VLM) has...

Retracking algorithms increase the accuracy of coastal sea surface height (SSH) measurements. However, it is still important to validate these retracking estimates with tide gauge (SSH tg) observations. We downloaded the freely available Jason altimeter SSH processed using the XTRACK-ALES algorithm, then detided the SSH using different tide models....

After the 2013 Mw 7.2 earthquake that occurred in Bohol, the shoreline specifically in Loon and Maribojoc was observed to shift seaward due to ground uplift. This study analyzes the post-earthquake shoreline movement, specifically a 12 km coastal strip in Loon and Maribojoc, and ground deformation of the West Bohol area through Sentinel-1 image pro...

One of the consequences of climate change is sea level rise (SLR). Near the coast SLR varies at different locations due to the contributions from regional/local climatic and non-climatic factors. Vertical land motion (VLM) can affect the accuracy of sea level observations from tide gauges (TG) that may exacerbate coastal area inundation/flooding. T...

A large oil spill in Iloilo Straight that occurred on July 3, 2020, as well as a possible deliberate, small but frequent oil spill and surfactant contamination in Manila Bay, were mapped. The method employs the Sentinel 2-1C image, which is transformed into principal components to reveal the presence of oil spills and possibly surfactants. Addition...

The enhanced temporal capability of today’s satellite sensors gives us large volumes of data to be processed, analysed, and visualized. Most of the conventional remote sensing software and land cover classification approaches, however, are only designed for single-date observations. To fully utilize the amount of data we receive and to improve land...

In the absence of enough gauging stations for monitoring lake water level, three (3) methods are presented in this research: (1) Synthetic Aperture Radar (SAR) backscatter from discrete object; (2) Global Navigation Satellite System (GNSS) levelling; and (3) satellite altimetry. The results showed that the Laguna Lake water level is not homogeneous...

With Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis (MADOCA), a software estimator of precise satellite information, by JAXA, u-blox C099 ZED-F9P and MSJ-3008-GM4-QZS using MADOCA-PPP can be exploited in GNSS applications that require sub-decimeter accuracy without being costly. To evaluate their performance, convergence time a...

Tectonic deformation displaces the physical positions of regional or national coordinate reference system and/or survey network reference markers quite significantly when situated within fast-deforming, seismically active Plate Boundary Zone (PBZ) regions. Due to unusually high station velocities that reflect high strains near and within active PBZ...

Tectonic deformation displaces the physical positions of regional or national coordinate reference system and/or survey network reference markers quite significantly when situated within fast-deforming, seismically active Plate Boundary Zone (PBZ) regions. Due to unusually high station velocities that reflect high strains near and within active PBZ...

Coupled with the occurrence of regional/local sea level rise on urbanized coastal cities is the possibility of land subsidence that contaminates the measurement by the tide gauge (TG) sensors. Another technology that could possibly check the in-situ data from tide gauge is satellite altimetry. The sea surface height (SSH) measured from satellite al...

Interest in blue carbon has drastically increased in recent years, particularly in improving the coastal resource carbon storage estimates and the development of methodology for identifying and monitoring such resources. In coastal resource mapping, participatory mapping techniques have the potential to provide a level of granularity and detail by...

The determination of the mean sea level (MSL) is very important in geodetic measurements. However, the accelerating rise in sea level brought about by climate change introduces uncertainties in present observations. While the effects of accelerated sea level rise vary according to geographical location, local climatological and geophysical conditio...

The release of new global geopotential models (GGMs) has raised the question of whether these GGMs could now supplant the development of regional/local geoid models. For geodetic surveying purposes the importance of a geoid model fitted to the local condition will greatly help in the resolution of many vertical datum issues especially for an archip...