Tool (or service) to generate a River Profile

From the discussion with Qina, we identified the tool (or service) to generate a river profile can be beneficial for other hydrologist. Also, the tool can be used not just for elevation profile but a profile for any variable stored in raster data.

The two major parts for this algorithm:

1. interpolate the equ-distance points from the line
2. reading the elevation (or any variable) from the raster for each points generated from #1. 

Python gdal library gives capability for #2, Python shapely gives capability for #1. 

Example and useful link:

http://gis.stackexchange.com/questions/59316/python-script-for-getting-elevation-difference-between-two-points

http://www.portailsig.org/content/python-utilisation-des-couches-vectorielles-et-matricielles-dans-une-perspective-geologique- (it is in French, you may need to use google translate)