[GRASS-user] Location of minimum value in raster

[Joshua Arnott]

Thanks everyone for the quick responses. I've managed to get what I needed.

I've been trying to improve upon the stochastic modelling of watershed 
boundaries, as described in the r.stream.basins manual and Metz and 
Jasiewicz (2011, p. 1167). Instead of using an area as the catchment 
outlet, I wanted to use the closest point in the extracted streams to 
where I thought the outlet should be (a known point). Finding the 
minimum in a raster allowed me to do the distance calculation needed for 
this.

The finished product – lines are median and 95% confidence intervals for 
DEM-derived catchment boundary:

http://snorf.net/pub/middleburn/basins_sto.png

Reference:
Jasiewicz, J., Metz, M., (2011). A new GRASS GIS toolkit for Hortonian 
analysis of drainage networks. Computers & Geosciences. 37. 1162–1173.