Lakes, like forests, rivers, and coastal waters, are shared natural resources. Presidential Decree No.1067 or the Water Code of the Philippines requires that the following distances be applied to particular land use: a) 3 meters for urban areas; b) 20 meters for agricultural areas; and c) 40 meters for forest are considered buffer zones and can be used by the public for recreation, navigation, floatage, fishing, and salvage. These areas are subject to private or public ownership (in natural parks) ownership and preferred land use. Since each lake has unique natural characteristics, the land use and cover surrounding the lakes vary with these characteristics and the development plans of the local government. The section below provides a picture of the Land Use Map covering the seven small crater lakes. Maps from the National Mapping and Resource Information Authority (NAMRIA) were used.
National Mapping and Resource Information Authority (NAMRIA) Maps
The maps below show the land cover maps of San Pablo City, Nagcarlan, and Rizal, Laguna for 2003, 2010, 2015, and 2020 from NAMRIA wherein the 200- and 500-meter buffer zones were outlined for each lake. The change in utilization in these areas were determined.
Land-Use Evolution per Lake at 200m Buffer
Land-Use Evolution per Lake at 500m Buffer
Semi-Supervised Classification of Satellite Data
(2018, 2020, 2022)
This project recognized the significance of the fisherfolks' local knowledge of the overall health of the lakes. They were requested to participate in the Focused Group Discussion (FGD) in identifying land use maps of the seven lakes; see data here. However, it is to be noted that the data derived from FGD are based on the participants' memories of the land use.