[GRASS-user] v.vol.rst interpolation results in rectangular isosurfaces

[Francois Chartier]

i will do that.  i think also as there is denilevation in that area, some
of the voxels are above ground which creates these 'empty' areas.

On Thu, Jan 31, 2019, 02:25 Markus Metz <markus.metz.giswork at gmail.com
wrote:

>
>
> On Sat, Jan 26, 2019 at 7:43 PM Francois Chartier <fra.chartier at gmail.com>
> wrote:
> >
> > Hi,
> >
> > Using v.vol.rst, (see command below, and g.region), the interpolation
> results in rectangular areas in certain areas, see attached photo.
> > Does this have to do with the segmentation process or something else?
>
> Most probably yes, try to increase npmin. Maybe you also need to increase
> segmax, but segmax should not be increased without increasing npmin,
> otherwise you might get more of these block artefacts.
>
> Markus M
> >
> >  v.vol.rst --overwrite input="Dec16CleanedJjan12 at Toronto" wcolumn="db\
>   |
> >  |    l_2" tension=10 smooth=0.1 segmax=50 npmin=200 npmax=700 dmin=0.1
> ws\   |
> >  |    cale=1.0 zscale=1.0 elevation="jan25"
> >
> > (Sat Jan 26 13:37:21 2019) Command finished (0 sec)
>
> > (Sat Jan 26 13:37:44 2019)
>
> > r3.info map=Jan25 at Toronto
>
> >
>  +----------------------------------------------------------------------------+
> >  | Layer:    Jan25 at Toronto                  Date: Fri Jan 25 22:12:59
> 2019    |
> >  | Mapset:   Toronto                        Login of Creator: Francois
> Charti |
> >  | Location: Toronto
>      |
> >  | DataBase: C:\Users\Francois Chartier\Documents\grassdata
>       |
> >  | Title:    jan25
>      |
> >  | Units:    none
>       |
> >  | Vertical unit: units
>       |
> >  | Timestamp: none
>      |
> >
>  |----------------------------------------------------------------------------|
> >  |
>      |
> >  |   Type of Map:  raster_3d            Number of Categories: 0
>       |
> >  |   Data Type:    FCELL
>      |
> >  |   Rows:         400
>      |
> >  |   Columns:      450
>      |
> >  |   Depths:       65
>       |
> >  |   Total Cells:  11700000
>       |
> >  |   Total size:           27646661 Bytes
>       |
> >  |   Number of tiles:      1575
>       |
> >  |   Mean tile size:       17553 Bytes
>      |
> >  |   Tile size in memory:  32400 Bytes
>      |
> >  |   Number of tiles in x, y and  z:   15, 15, 7
>      |
> >  |   Dimension of a tile in x, y, z:   30, 27, 10
>       |
> >  |
>      |
> >  |        Projection: UTM (zone 17)
>       |
> >  |            N:    4837000    S:    4833000   Res:    10
>       |
> >  |            E:     632500    W:     628000   Res:    10
>       |
> >  |            T:        115    B:         50   Res:     1
>       |
> >  |   Range of data:   min = -25.42733002 max = 121.86579132
>       |
> >  |
>      |
> >  |   Data Source:
>       |
> >  |
>      |
> >  |
>      |
> >  |
>      |
> >  |   Data Description:
>      |
> >  |    generated by v.vol.rst
>      |
> >  |
>      |
> >  |   Comments:
>      |
> >  |    v.vol.rst --overwrite input="Dec16CleanedJjan12 at Toronto"
> wcolumn="db\   |
> >  |    l_2" tension=10 smooth=0.1 segmax=50 npmin=200 npmax=700 dmin=0.1
> ws\   |
> >  |    cale=1.0 zscale=1.0 elevation="jan25"
>       |
> >  |
>      |
> >
>  +----------------------------------------------------------------------------+
> > (Sat Jan 26 13:37:45 2019) Command finished (0 sec)
>
> >
> > C:\Users\Francois Chartier>g.region -p3
> > projection: 1 (UTM)
> > zone:       17
> > datum:      nad83
> > ellipsoid:  grs80
> > north:      4837000
> > south:      4833000
> > west:       628000
> > east:       632500
> > top:        115.00000000
> > bottom:     50.00000000
> > nsres:      10
> > nsres3:     10
> > ewres:      10
> > ewres3:     10
> > tbres:      1
> > rows:       400
> > rows3:      400
> > cols:       450
> > cols3:      450
> > depths:     65
> > cells:      180000
> > cells3:     11700000
> >
> > C:\Users\Francois Chartier>
> >
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