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National monitoring of forests is essential for tracking progress towards various global environmental goals, including those of the Kunming-Montreal Global Biodiversity Framework and the Paris Agreement. Inconsistent national definitions of “forest”, however, can complicate the tracking of global progress towards achieving these goals. The FAO’s (Food and Agricultural Organization of the UN) definition of “Forest” is well-known and broad enough to be applicable globally, but it is difficult for countries to produce national forest maps according to this definition using only a single source of remote sensing data. Here, we developed an approach to integrate multiple existing land use/land cover (LULC) maps and generate an integrated map of forests and “Other land with tree cover” that is more consistent with FAO definitions. The proposed approach is based on merging thematic information from the global “PALSAR-2 Forest/Non-forest map”, a global forest/non-forest map, with that of a national map containing more detailed LULC classes. By applying the map integration approach at the national level in the Philippines as a case study, we identified 5.937 ± 0.217 Mha of “Missing forest” that were not included in the country’s national LULC map, mainly forest patches in areas that were predominantly “Brush/shrub”, “Grassland”, or “Marshland/swamp” lands. We also identified 4.294 ± 0.258 Mha of land corresponding to FAO’s definition of “Other land with tree cover” that were previously unmapped; specifically, patches of tree cover on predominantly agricultural and urban lands. Based on these additional areas of “Forest” and “Other land with tree cover” identified, we further estimated an additional 145,480 GgCO2/year of carbon sinks. Our approach is generalizable enough to potentially be applied in other countries for more standardized forest and ecosystem services monitoring. |
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