Use PostGIS if we're still able to adjust scale?

[markfarrell]

I'd recommend using PostgreSQL/PostGIS, taking elevation data from all of those data sources, massaging the data and storing it all in a spatial table of points. We could even include the original data source as a feature of each of the points, as well as the publication date of the data source, useful for doing provenance. We'd basically then have just have a CGI script that queries our geospatial database for all of the points inside of a requested bounding box and serializes the result set of points in a requested format. But my concern is that we would not be able to set the distance in metres between points, the scale parameter in our requests, should we choose to do this. I don't believe this is possible with PostGIS, unless I'm mistaken.

[rwarren2]

That's a reasonable thing to do for the moment, through later I would rather use a geosparql approach.

Think of this as making multiple passes on the data;