Thinking Machines, a Philippine data science services company, did an analysis of where in the Philippines buildings are still missing by comparing OSM data with the Facebook's population dataset:
https://stories.thinkingmachin.es/mapthegap The provinces that are very complete are due to mapping in the wake of disasters (like Typhoon Haiyan in 2013 and Typhoon Mangkhut in 2018) like Leyte and Cagayan, and due to Project ISAIAH, the building mapping project of NOAH, a government disaster analysis institution, like Cavite, Batangas, and Zambales.
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