I had a similar problem to solve and I found this blog post really usefull: http://blog.mathieu-leplatre.info/drape-lines-on-a-dem-with-postgis.html It tells you how to import a DTM in PostGis and associate its altitude values to any overlapping polyline.
Marco -- *Marco Barbieri* Cartografo www.webmapp.it marcobarbi...@webmapp.it +39 347 683 03 13 Via Paladini, 4 50053 Empoli - Firenze Ditta individuale P. Iva 06366160486
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