Looking for More Sources on Official Boundaries

From my research, there seem to be no official digital sources providing information on Thailand’s borders, administrative levels, and national parks. A quick comparison of various map providers like Google, Bing, Apple, Longdo, and the Royal Thai Survey shows discrepancies.

This might be because the official drawings are only available in PDF format at https://www.ratchakitcha.soc.go.th/, and there might be some interpretation inaccuracies.

Any suggestions for other digital sources that could shed light on this?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/looking-for-more-sources-on-official-boundaries/108846