Is there a good dataset on global ocean sea surface height? I found this, http://climate.nasa.gov/interactives/sea_level_viewer, but there is no data I can download and it's hard to see the latitude and longitude coordinates.
The easiest global sea surface height database is from Aviso: http://www.aviso.oceanobs.com/en/data/products/sea-surface-height-products/global.html Aviso has been distributing Topex/Poseidon and ERS altimetric data worldwide since 1992.
For long-term sea level data, some of the PSMSL (Permenant Service for Mean Sea Level) datasets may be of use. These only cover discrete points, mostly tide gauges on coasts, but do so for the long term, giving monthly and annual means.