Hi Rob, Andrea,
Just a hint – I have done something similar a few years ago, querying a DEM on
a server and computing viewsheds on the fly. I think the problem you are
encountering is because you are using a WMS – a WCS is much more suited, as it
serves raw data, not rendered images.
I remember that at the time I was experiencing some issues, as what I needed
were raw int values for elevation and I Geoserver did support this well – we
actually migrated our partners (the data custodians) from Deegree to achieve
exactly this. I ingested the data through a custom-made Geotools-based code.
What we used it for is described here:
1. Purves, R. S., Edwardes, A. J., Fan, X., Hall, M. M., & Tomko, M. (2010).
Automatically Generating Keywords for Georeferenced
Images<http://martintomko.files.wordpress.com/2011/11/purves10automatically.pdf>.
Paper presented at the GIS Research UK 2010 Conference, 14. -16. April 2010,
London, UK.
1. Tomko, M., & Purves, R. S. (2010). Matterhorn on the Horizon:
Identification of Salient Mountains for Image
Annotation<http://martintomko.files.wordpress.com/2011/11/tomko10horizons.pdf>.
Paper presented at the GIS Research UK Conference 2010, 14. – 16. April 2010,
London, UK.
Hope this helps,
Martin
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