[R-sig-Geo] create a triangular grid ?

[MacQueen, Don]

 spsample( type='hexagonal') will generate points in what some might call
a triangular grid.

They'll just be independent points, with no underlying structure declaring
them to be a grid, but at least you'll have them.

sp::over() may help you trim a rectangular grid; ?sp::over has an example
applying it to a grid.

-Don


-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 9/30/16, 4:26 AM, "R-sig-Geo on behalf of Fernando Paim"
<r-sig-geo-bounces at r-project.org on behalf of fernandopaim at paim.pro.br>
wrote:

> 
>
>Hello everyone,
>
>I need to create a triangular grid for kriging.
>I've tried with makegrid, expand.grid but with just a rectangular grid.
>I have not been able to find a method to trim the rectangular grid to
>the newdata same shape of the original data, is this possible?
>
>The
>data (x,y,z) are available in
>http://www.paim.pro.br/downloads/dados.csv
>
>Can anyone help?
>
>Thanks in
>advance,
>
>Fernando Paim 
>
> 
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>
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