Re: [GRASS-user] mapcalc combining raster and vector

[Moritz Lennert]

On 8/05/19 15:03, Francois Chartier wrote:

Hi Micha,

I have soil samples from boreholes where i have data points at every 
meter interval and where soil type changes.  i would like to create a 
weighted average of soil property for lets say the first 1 m below the 
DEM, so that i can evaluate potential for infiltration across a watershed.


You can use v.what.rast to read the DEM value into the attribute table 
of your points. Then you can do whatever calculations you need based on 
that.


Moritz



On Wed., May 8, 2019, 08:17 Moritz Lennert, 
mailto:mlenn...@club.worldonline.be>> wrote:


On 8/05/19 14:00, Micha Silver wrote:
 > You will most likely have to convert the points to raster. But
before
 > that, can you explain what you mean by "located for 10 m from
DEM", "10
 > to 20".

Or, if you mean zones of equal height, you can transform them to vector
polygons and use v.vect.stats on these polygons and the points.

Moritz

 >
 >
 > On 08/05/2019 13:31, Francois Chartier wrote:
 >> Hi
 >>
 >> I would like to use mapcalc with types of input a DEM (raster)
and xyz
 >> property (vector).  basically, I would like to do a weighted
average
 >> of data points located for 10 m from DEM, then 10 to 20 etc.
 >>
 >> ___
 >> grass-user mailing list
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 >> https://lists.osgeo.org/mailman/listinfo/grass-user
 >
 > --
 > Micha Silver
 > Ben Gurion Univ.
 > Sde Boker, Remote Sensing Lab
 > +972-523-665918
 >
 >
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 > grass-user@lists.osgeo.org 
 > https://lists.osgeo.org/mailman/listinfo/grass-user
 >





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Re: [GRASS-user] mapcalc combining raster and vector

[Francois Chartier]

Hi Micha,

I have soil samples from boreholes where i have data points at every meter
interval and where soil type changes.  i would like to create a weighted
average of soil property for lets say the first 1 m below the DEM, so that
i can evaluate potential for infiltration across a watershed.

On Wed., May 8, 2019, 08:17 Moritz Lennert, 
wrote:

> On 8/05/19 14:00, Micha Silver wrote:
> > You will most likely have to convert the points to raster. But before
> > that, can you explain what you mean by "located for 10 m from DEM", "10
> > to 20".
>
> Or, if you mean zones of equal height, you can transform them to vector
> polygons and use v.vect.stats on these polygons and the points.
>
> Moritz
>
> >
> >
> > On 08/05/2019 13:31, Francois Chartier wrote:
> >> Hi
> >>
> >> I would like to use mapcalc with types of input a DEM (raster) and xyz
> >> property (vector).  basically, I would like to do a weighted average
> >> of data points located for 10 m from DEM, then 10 to 20 etc.
> >>
> >> ___
> >> grass-user mailing list
> >> grass-user@lists.osgeo.org
> >> https://lists.osgeo.org/mailman/listinfo/grass-user
> >
> > --
> > Micha Silver
> > Ben Gurion Univ.
> > Sde Boker, Remote Sensing Lab
> > +972-523-665918
> >
> >
> > ___
> > grass-user mailing list
> > grass-user@lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/grass-user
> >
>
>
>
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Re: [GRASS-user] mapcalc combining raster and vector

[Moritz Lennert]

On 8/05/19 14:00, Micha Silver wrote:
You will most likely have to convert the points to raster. But before 
that, can you explain what you mean by "located for 10 m from DEM", "10 
to 20".


Or, if you mean zones of equal height, you can transform them to vector 
polygons and use v.vect.stats on these polygons and the points.


Moritz




On 08/05/2019 13:31, Francois Chartier wrote:

Hi

I would like to use mapcalc with types of input a DEM (raster) and xyz 
property (vector).  basically, I would like to do a weighted average 
of data points located for 10 m from DEM, then 10 to 20 etc.


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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
+972-523-665918


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Re: [GRASS-user] mapcalc combining raster and vector

[Micha Silver]

  
  
You will most likely have to convert the points to raster. But
  before that, can you explain what you mean by "located for 10 m
  from DEM", "10 to 20".  



On 08/05/2019 13:31, Francois Chartier
  wrote:


  
  Hi


I would like to use mapcalc with types of input
  a DEM (raster) and xyz property (vector).  basically, I would
  like to do a weighted average of data points located for 10 m
  from DEM, then 10 to 20 etc.  
  
  
  
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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
+972-523-665918
  

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[GRASS-user] mapcalc combining raster and vector

[Francois Chartier]

Hi

I would like to use mapcalc with types of input a DEM (raster) and xyz
property (vector).  basically, I would like to do a weighted average of
data points located for 10 m from DEM, then 10 to 20 etc.
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[GRASS-user] Detecting and carving culverts in LiDAR DEMs

[Stefan Blumentrath]

Dear all,

Since there is a lot of expertise on the ML in hydrology and LiDAR, I was 
wondering if someone is aware of a GRASS approach for identifying and carving 
Culverts (as well as removing bridges) in LiDAR DEMs.

Here some non-GRASS examples of what has been done earlier:
https://www.tandfonline.com/doi/full/10.1080/13658816.2018.1530353
https://www.sciencebase.gov/catalog/item/59971732e4b0b589267bbb22

I do have an idea of how to solve this in GRASS (also conceptually a bit 
different from the approaches above), with a rather simple / simplistic prove 
of concept based on geomorphometrics.
Yet, maybe someone around has a good procedure ready? Is there collaboration 
potential / interest?

Cheers
Stefan

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