#83: r.param.scale - plan curvature doesn't work
---------------------+------------------------------------------------------
Reporter: guano | Owner: grass-dev@lists.osgeo.org
Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: default | Version: unspecified
Keywords: |
---------------------+------------------------------------------------------
Maps of plan curvature calculated using r.param.scale results in a map
with a very very very narrow distribution (histogram attached), therefore
we can't see any of the features.
{{{
g.region rast=elevation.10m -p
r.param.scale elevation.10m out=planc param=planc
r.univar planc
total null and non-null cells: 2654802
total null cells: 0
Of the non-null cells:
----------------------
n: 2654802
minimum: -56.0318
maximum: 63.5533
range: 119.585
mean: 0.000136618
mean of absolute values: 0.0203089
standard deviation: 0.0846529
variance: 0.00716612
variation coefficient: 61963.3 %
sum: 362.6935644354
}}}
looks like equally distributed to me. The question is: is the color coding
bad or is the result wrong? This could be tested with synthetic curves
(see source:grass/trunk/testsuite/raster/rhemisphere.sh)
Markus
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/83#comment:4>
GRASS GIS <http://grass.osgeo.org>
Commonly referred to as GRASS, this is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. GRASS is official project of the Open Source Geospatial Foundation.
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/83#comment:4>
GRASS GIS <http://grass.osgeo.org>
Commonly referred to as GRASS, this is a Geographic Information System
(GIS) used for geospatial data management and analysis, image
processing, graphics/maps production, spatial modeling, and
visualization. GRASS is currently used in academic and commercial
settings around the world, as well as by many governmental agencies and
environmental consulting companies. GRASS is official project of the
Open Source Geospatial Foundation.
can the end part "Commonly referred to as GRASS..." be removed from the
bug report emails? It doesn't seem to fill any service, and think of the
wasted bytes..
....
> --
> Ticket URL: <http://trac.osgeo.org/grass/ticket/83#comment:4>
> GRASS GIS <http://grass.osgeo.org>
> Commonly referred to as GRASS, this is a Geographic Information System
> (GIS) used for geospatial data management and analysis, image
> processing, graphics/maps production, spatial modeling, and
> visualization. GRASS is currently used in academic and commercial
> settings around the world, as well as by many governmental agencies and
> environmental consulting companies. GRASS is official project of the
> Open Source Geospatial Foundation.
can the end part "Commonly referred to as GRASS..." be removed from the
bug report emails? It doesn't seem to fill any service, and think of the
wasted bytes..
I just tried it out - it is just bad color coding - changing to curvature
color table works. This can be either fixed in the code or just suggest in
the manual to set the color table to curvature. I think this can be
closed.
Replying to [comment:6 helena]:
> I just tried it out - it is just bad color coding - changing to
curvature color table works. This can be either fixed in the code