Hi Tiago,

The first two points are in water??

This might be helpful:

library(sp)
library(rgdal)
orig <- data.frame(lat = c(23.2383,23.2383,23.2383), long = c(-78.3133,
-78.3100,-78.3100), elv = c(4.01, 4.00, 4.00))
coordinates(orig) <- ~long+lat
proj4string(orig) <- CRS("+proj=longlat +ellps=WGS84")
orig <- spTransform(orig, CRS("+proj=utm +zone=18 +north +units=m
+ellps=WGS84"))

Applied spatial Data analysis with R is best book to look for such solution.


Cheers,

Vikram.




On Mon, Feb 17, 2014 at 6:53 PM, ONKELINX, Thierry <Thierry.ONKELINX@inbo.be
> wrote:

> Dear Tiago,
>
> You can use spTransform from the sp package. Note that you need to know
> what the current and new projection and datum of your data is.
>
> Best regards,
>
> Thierry
>
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
> Forest
> team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
> Kliniekstraat 25
> 1070 Anderlecht
> Belgium
> + 32 2 525 02 51
> + 32 54 43 61 85
> Thierry.Onkelinx@inbo.be
> www.inbo.be
>
> To call in the statistician after the experiment is done may be no more
> than asking him to perform a post-mortem examination: he may be able to say
> what the experiment died of.
> ~ Sir Ronald Aylmer Fisher
>
> The plural of anecdote is not data.
> ~ Roger Brinner
>
> The combination of some data and an aching desire for an answer does not
> ensure that a reasonable answer can be extracted from a given body of data.
> ~ John Tukey
>
> -----Oorspronkelijk bericht-----
> Van: r-sig-geo-bounces@r-project.org [mailto:
> r-sig-geo-bounces@r-project.org] Namens Tiago Marques
> Verzonden: maandag 17 februari 2014 14:10
> Aan: r-sig-geo@r-project.org
> Onderwerp: [R-sig-Geo] projecting data from decimal degrees to meters
>
> Dear List,
>
> Sorry if this is a very basic question, I've searched around and could not
> find a simple answer to it. I am familiar with R, but not with geo/GIS
> stuff. I have a matrix zs containing 3 columns, longitude, latitude and
> depth. Depth is available at a regular grid of points covering
> approximately 200 by 200 km in the Bahamas. The first few lines of the data
> are below:
>
> head(zs)
>          lat        long    z
> 1 23.2383 -78.3133 4.01
> 2 23.2383 -78.3100 4.00
> 3 23.2383 -78.3066 4.00
> 4 23.2383 -78.3033 4.00
> 5 23.2383 -78.3000 4.00
>
> I would like to implement some animal movement simulations, and my
> movement model is parametrized in terms of displacement, in meters. How can
> I project zs to a matrix containing say x,y,z in which the x,y are in
> meters.
>
> Best, and many thanks in advance for any advice coming this way.
>
> Tiago
>
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