[GRASS-user] Re: QGIS GRASS plugin shadedrelief issue

nunosousa84 nuno_sousa_1984 at hotmail.com
Mon Sep 20 12:18:36 EDT 2010

Here are the results:


Well im not sure but at first glance doesnt seem to have much relation. This
vector points layer that appear after runing the v.clean command shows also
possible duplication of lines or just crossing lines? I have made a zoom to
the vector lines where those 11 vector points are located and dont seem to
recognize the problem.

Here goes the comparation results for both r.surf.contour layer and shaded
relief layer, using the r.univar query:

(surfcontour layer)

total null and non-null cells: 2256660
total null cells: 0
Of the non-null cells:
n: 2256660
minimum: 430
maximum: 760
range: 330
mean: 541.46
mean of absolute values: 541.46
standard deviation: 66.726
variance: 4452.36
variation coefficient: 12.3234 %
sum: 1221890343.312690258

(shadedrelief layer)

total null and non-null cells: 2256660
total null cells: 6164
Of the non-null cells:
n: 2250496
minimum: -75.1119
maximum: 100
range: 175.112
mean: 42.1701
mean of absolute values: 48.816
standard deviation: 35.304
variance: 1246.37
variation coefficient: 83.718 %
sum: 94903752.6220222563

It seems only when i run the command shaded relief that null cells appears.
Is it normal?

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