Agricultural zoning question

If land is clearly in a farming area what types of use are allowed?

Example can an apartment building be built?

Can a restaurant be built?

Also how do you confirm the zoning of land?

I understand that zoning is sometimes not observed in Thailand but sometimes it is for example a big factory normally can't be built without permits and maybe not at all in certain areas.

Not exactly sure about the law but I would recommend checking with the Land office. I built 2 apartment buildings, 1 in Chiang Mai and 1 in khon Kaen. Both needed building approvals but they were in Muang district. Also I built a farm on the country side and was told no building approval needed. Best just to check each time when you plan to build something bigger.