#1874: latitudinal bias in sample points created with r.random
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Reporter: pvanbosgeo | Owner: grass-dev@…
Type: defect | Status: new
Priority: major | Milestone: 7.0.0
Component: Default | Version: svn-trunk
Keywords: | Platform: Linux
Cpu: x86-64 |
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Point patterns generated with r.random show a strong latitudinal bias,
with considerably higher density at higher latitudes.
The attached screenshot illustrates this. It shows the sum of number of
points in a moving window (21x21 - created with r.neighbors.
This is fairly serious because especially at lower sample densities, one
may not always notice this bias, thus introducing unknowingly such bias in
analysis.
Note that points created with v.random do no show a bias. However, this is
not really an alternative for creating random points within a irregular
area.
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Ticket URL: <http://trac.osgeo.org/grass/ticket/1874>
GRASS GIS <http://grass.osgeo.org>
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