Embedded Files
Welcome to my mapping portfolio! Here, you'll find a collection of maps created with QGIS, highlighting my skills in geographic information systems and spatial analysis. Each map is a result of my dedication to visually interpreting data and making information more accessible and impactful. As I continue to build this portfolio, I look forward to adding diverse projects that showcase my expanding expertise in GIS and my commitment to creating meaningful, data-driven visuals.
Suitability Map
Roadmap
Storm Surge Hazard Maps of Sorsogon
Since not everyone is aware and familiar in using the Nationwide Operational Assessment of Hazards (NOAH) Website, I made maps that can easily be accessed by people from Sorsogon. The idea is that these maps are for those people that finds it difficult to navigate and learn about how websites function and would rather conveniently see the maps in images on SocMed and check whether they are affected by storm surge hazards.
See municipal-level maps...
Topography of Catanduanes, Region V, Philippines
Reimagining Sorsogon as an Island with 3D Visalization
Recorded Earthquakes in the Philippines from January to October 2024
Streets of Legazpi City
Effects of DEM Resolution on the Morphometric Characteristics
of Chico River Basin, Philippines
In my study, I compared the outputs of watershed dellineation processes of varying three DEM Resolutions (90 m, 30 m, and 5m) to see how it would affect the process. Using 90 m, 30 m, and 5 m resolutions of DEM, Chico RB was delineated. Further, the river basin was also characterized using various morphometric parameters which was detailed in the write-up.
Software: QGIS 3.36.1 Maidenhead
Tool/Plugin: WhiteboxTools
chico river basin
chico river basin
Chico River Basin is a vital component of the northern Luzon hydrological system. Located at the heart of the Cordillera Administrative Region (CAR), Chico RB was established by Proclamation No. 573 on June 26, 1969. Encompassing Parcel No. 2, which includes the Chico Forest Reserve spanning from Mt. Province down to Ifugao, Kalinga, and Apayao. This basin lies between 16°49'28" to 17°57'58" north latitude and 120°50'37" to 120°33'14" east longitude (DENR INREMP, 2015). In this study,
Chico River Basin Map in
90 m DEM Resolution
Chico River Basin Map in
90 m DEM Resolution
The 90-meter resolution provides a more generalized representation of the subwatersheds and stream networks. The lower resolution smooths out finer details, resulting in broader, less distinct watershed boundaries. This map is suitable for regional analysis but may lack the detail needed for smaller-scale, precise studies.
Chico River Basin Map in
30 m DEM Resolution
Chico River Basin Map in
30 m DEM Resolution
At 30 meters, the map offers a more refined depiction of the Chico River Basin. The stream networks and watershed boundaries are more detailed than the 90-meter map, showing improved definition of smaller subwatersheds. This resolution balances detail and computational efficiency, making it effective for medium-scale analyses.
Chico River Basin Map in
5 m DEM Resolution
Chico River Basin Map in
5 m DEM Resolution
The 5-meter resolution provides the highest level of detail among the three. This map reveals intricate watershed boundaries and a more complex stream network, capturing small-scale features that are not visible in the 30- or 90-meter maps. It is ideal for localized, precise studies but may require more processing power and storage due to the increased data size. However, may seem unnecesary at a much larger scale.
Chico RB and sub watersheds outputs of 5-meter DEM resolution. Showing minor difference when viewed smaller scale but has observable difference when viewed at a larger scale.
Stream validation using Google satellite imagery. Map validation further presents to what extent does the streams from the DEM resolutions match the actual streams and whether what type of streams does each order are.
Slope maps of three DEM resolutions. Map (c) showing relatively more areas with high slopes and less low slopes than in maps (a) and (b).
Difference of slope values per pixel between different DEM resolutions. All maps show relatively low relative differences in each pixel. However, the 90 m and 5m (b) show more zero difference in the areas of lower elevation.
Differences in the extracted Streams from the DEM resolutions
Stream validation using Google satellite imagery. Map validation further presents to what extent does the streams from the DEM resolutions match the actual streams and whether what type of streams does each order are.
Elevation map outputs of Chico RB of three different DEM resolutions. Lighter shades of green in (c) shows having less low/lowest elevation values than in (a) and (b).
Difference of elevation values per pixel between different DEM resolutions. Differences between DEM resolutions are observably consistent with low absolute relative difference in the lower elevations and zero or close to zero differences in the high elevations.
The study finds that DEM resolution affects measurements like catchment area, perimeter, and other watershed parameters, with finer resolutions offering more accuracy but requiring more resources. Choosing the right resolution should depend on project needs, as parameters can vary significantly with scale. Visual differences also vary with map scale, so interpreting maps should be scale-appropriate. Overall, selecting the correct DEM resolution involves balancing accuracy, project goals, and device capabilities.
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