1v.kernel(1) Grass User's Manual v.kernel(1)
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6 v.kernel - Generates a raster density map from vector points data
7 using a moving 2D isotropic Gaussian kernel or optionally generates a
8 vector density map on vector network with a 1D kernel
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11 vector, kernel density
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14 v.kernel
15 v.kernel help
16 v.kernel [-oqv] input=name [net=name] output=string stddevia‐
17 tion=float [dsize=float] [segmax=float] [distmax=float]
18 [mult=float]
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20 Flags:
21 -o Try to calculate an optimal standard deviation with 'stddeviation'
22 taken as maximum (experimental)
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24 -q Only calculate optimal standard deviation and exit (no map is writ‐
25 ten)
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27 -v Run verbosely
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29 Parameters:
30 input=name
31 Input vector with training points
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33 net=name
34 Input network vector map
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36 output=string
37 output raster/vector map
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39 stddeviation=float
40 stddeviation in map units
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42 dsize=float
43 discretization error in map units Default: 0.
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45 segmax=float
46 maximum length of segment on network Default: 100.
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48 distmax=float
49 maximum distance from point to network Default: 100.
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51 mult=float
52 multiply the density result by this number Default: 1.
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55 Generates a raster density map from vector points data using a moving
56 2D isotropic Gaussian kernel or optionally generates a vector density
57 map on vector network with a 1D kernel.
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60 The mult option is needed to overcome the limitation that the resulting
61 density in case of a vector map output is stored as category (Integer).
62 The density result stored as category may be multiplied by this number.
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64 With the -o flag (experimental) the command tries to calculate an opti‐
65 mal standard deviation. The value of stddeviation is taken as maximum
66 value. Standard deviation is calculated using ALL points, not just
67 those in the current region.
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70 The modules only considers the presence of point, but not (yet) any
71 attribute values.
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74 v.surf.rst
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77 Stefano Menegon, ITC-irst, Trento, Italy
78 Radim Blazek (network part)
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80 Last changed: $Date: 2005/01/11 10:23:39 $
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82 Full index
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86GRASS 6.2.2 v.kernel(1)