I am trying to determine the level of rise in sea levels in coastal areas of India and Bangladesh. I was wondering if anyone knew the best sources of open data--mean local sea level, mean local tide level--for this type of information.
From what I gather, it seems like mean sea level or tidal data is the best way to go. That is just because sea level is not a constant value, but fluctuates over time. So we need some sort of average tide level--basically how far above sea level the tide extends. Then I can determine which areas of these countries are submerged given this level of tide using existing elevation data.