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I have downloaded some data from http://asterweb.jpl.nasa.gov/gdem.asp

I would like to relate the elevations to some coastal data which is estimated to a specific ordnance dataum.

Can anyone tell me what the datum (i.e. 0) refers to in ASTER data?

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Here's a one-line answer for you: in this Aster User Guide on page 55 the Datum for all ASTER data processed at GDS is WGS84.

Another one liner: this post has plenty of datum discussion.

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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