The Protected Area are valued billions in terms of ecosystem services it provides to people likewise, it also plays important role in absorbing and storing carbon which is an essential component in the solution to climate change. A portion of catchment which can be found within Mount Mantalingahan Mountain Landsacpe (MMPL) Protected Area has a total land area of 1,474 ha which constitutes of core zone (157 ha), restricted use zone (55 ha), controlled use zone (448 ha), traditional use zone (814 ha) and multiple use zone (87 ha) respectively (GIS, 2021). The extend of the catchment areas encompasses six barangays such as Pangobilian, Poblacion, Oring-Oring, Saraza, Tubtub and Amas (GIS, 2021).
The main step of urban expansion studies is to determine initial and final situation of interested area. This step is often accomplished by the classification of the satellite data. In other words, the determination of Land use and Land Cover (LULC) of interested area. The LULC analyzes are very important to determine the urban expansion and to predict growth of urban areas in the future. Generally, LULC analysis is used to examine the causes and consequences of land changes and to determine land use planning and policy (Megahed et al, 2015). Although, Geographic Information System is being used by the Palawan Council for Sustainable Development Staff to track changes in the environment of Palawan, thus, providing the PCSD with a scientific and realistic picture necessary in projecting better decisions, this possibility of Geospatial Study of Settlement and Urban Sprawl in Maruyog Catchment has not been fully explored.
The classified map shows that the built-up areas are simultaneously crawling within the catchment mostly on the areas with agricultural crops, it is noticeable that built-ups are mostly migrating towards Northeast and Southeast of the catchment wherein paddy and urban areas are concentrated respectively. Agriculture and forest land covers are what dominate the catchment, however urban expansion began from 2008 to 2016 and continuously expanding until 2020. Kaingin is one among the land cover types that’s consistently expanding on the mountains of the catchment. It can be seen on the map that kaingin is slowly encroaching the forests since 2008.
Table 1. Quantitative Distribution of Land cover in Maruyog Catchment in 2008, 2016, 2020 in hectares
The land classification maps produced using GIS software calculated the distribution of each land cover types of the catchment for the periods of 2008, 2016 and 2020. The six land cover types and their estimated extent are shown in Table 2. The most significant land cover change can be observed on forest which decreased by 3%, followed by built-up which increased by 2% and, lastly kaingin also increased by 2% since 2008. Urbanization is increasing globally and is considered a main driver of environmental change (Grimm et al., 2008) and similarly, Maruyog catchment is gradually experiencing this phenomenon.