[GRASS-user] DEM with bathymetric contour lines

Markus Neteler neteler at osgeo.org
Tue Jun 2 02:58:37 PDT 2015

On Tue, Jun 2, 2015 at 10:18 AM, Tomáš Brunclík <brunclik at atlas.cz> wrote:
> Hello all,
> after about 10 hours of processing (the computer got to sleep state over
> night) still progress 0%.

You may file an enhancement ticket - likely r.surf.contour has never
been optimized.

>  Is it normal on such region size and core i5 PC?

Well, it will only use 1 CPU unless being parallelized. But often a
code optimization is more efficient (as done for many modules in GRASS
GIS 7, see https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures).
Maybe there is potential in r.surf.contour as well.

Just one other hint below:

> Dne 1.6.2015 v 11:44 Tomáš Brunclík napsal(a):
> Hi Irantzu,
> I am just trying again with this dataset:
> https://dl.dropboxusercontent.com/u/24062833/ES2003_1m_mb_contour.zip
> For the record, the commands I used:
> #First created new location using the data as source of its projection
> settings and imported the file (from startup GUI), then:
> g.region vector=ES2003_1m_mb_contour at PERMANENT
> g.region res=1

better use

g.region res=1 -a

in order to avoid "odd" pixel resolution:

> g.region -p
> nsres:      0.99998578
> ewres:      1.00006542

... this will then become precisely 1.0.

I'll now try myself the interpolation.


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