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I am in the process of writing my thesis on flood hazard preparedness and forecasting in South East Asia, specifically Thailand. My analysis requires a medium resolution (even better, high resolution) digital elevation model for Bangkok and vicinity areas. I really appreciate if anyone can point me out where I can find such data? My internet search so far returns not DEM data but only finished maps from different organizations.

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Have you looked into SRTM data? – underdark♦ Oct 1 '12 at 18:10
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SRTM data will probably be around 90m resolution in this area, to do any relevant hydrological modeling you really need to be at least 10m resolution, and ideally sub 2m. – sgrieve Oct 1 '12 at 18:51
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There are sources of lidar data for Bangkok, but they are not free. I would be surprised if a lot of areas in SE Asia had not been flown. The challenge would be to convince a company/government department to give it to you for free. – sgrieve Oct 1 '12 at 18:56

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I suggest Aster DEM for your purpose. You can download 30MX30M DEM from ASTER GDEM

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Not entirely free, thought quality better than SRTM. – Tomek Oct 2 '12 at 5:25
Thanks! I will try ASTER DEM. – adfs Oct 2 '12 at 7:59

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