[R-sig-Geo] units is semivariograms in GeoR

[Ben Madin]

You will need to transform (re-project) your data into a suitable coordinate system - use the sptransform() function in the rgdal package, or look at p 64 in the ASDAR book.

depending on where you data is and how large an area it covers will influence your choice of coordinate reference system, but you might get away with a UTM grid 19 North for Puerto Rico - have a look here :

http://spatialreference.org/ref/epsg/32619/

cheers

Ben


On 16/11/2011, at 11:42 PM, carolina monmany wrote:

> Sorry. My problem is that I want the units in the x axis to be in meters
> but they are in degrees. How can I make R read the projected coordinate
> system, which is in meters, and not the geographic one?
> 
> Thanks!
> 
> 2011/11/16 Paul Hiemstra <paul.hiemstra at knmi.nl>
> 
>> Hi,
>> 
>> This is mail is a bit on the short side :), so please try and be more
>> complete next time. I think what you want to know is what the units are
>> in a semi-variogram. For the y-axis, they are the unit of the variable
>> of interest squared. So if the variable is m/s, than the semi-variogram
>> has units (m/s)^2. For the x-axis they are most probably the distance
>> unit in which the coordinate system of your data set is, e.g. kilometer.
>> 
>> hope this helps,
>> Paul
>> 
>> On 11/16/2011 03:08 PM, carolina monmany wrote:
>> 
>> --
>> Paul Hiemstra, Ph.D.
>> Global Climate Division
>> Royal Netherlands Meteorological Institute (KNMI)
>> Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
>> P.O. Box 201 | 3730 AE | De Bilt
>> tel: +31 30 2206 494
>> 
>> http://intamap.geo.uu.nl/~paul
>> http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770
>> 
>> 
> 
> 
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