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

[Fernando Paim]

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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