This section of the documentation, seems the most important bit to read:
http://code.google.com/apis/maps/documentation/elevation/#Limits

> Note: the Elevation API may only be used in conjunction with displaying 
> results on a Google map; using elevation data without displaying a map for 
> which elevation data was requested is prohibited.

Google are not the only to offer an API
http://www.google.co.uk/search?q=elevation+API


On 8 June 2011 16:46, Liyth Nissirat <[email protected]> wrote:
> Dear All,
>
> My name is Liyth, I am working on analysing microwave propagation data
> over an area. My study includes relating the elevations of points to
> the propagation losses. My question is as follows: if I have a set of
> lat-long points can I retrieve the elevations from google maps
> elevation service via MATLAB commands? If it is possible, how to do it
> or where can I find documentation to read?
>
> Thank you
>
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