Conversion of lat/long coordinates to ETRS89

Daniel,

Dear Mauricio,

I would confirm the use of rgdal::spTransform as appropriate. Also, one could add creating a CRS database as follows:

#European Petroleum Survey Group list creation
EPSG <- make_EPSG()

The geographical ETRS89 CRS is then the following I believe:

#ETRS89 (= EUREF89 = GRS80)
CRS("+init=epsg:4258")

Actually ETRS89 / ETRS-TM35FIN for Finland is epsg code 3067.
Applying spTransform following this function's instructions shouldn't be a challenge I believe. I would strongly recommend comparing your new geographical/cartographical projections the first time you use this function in order to validate their accuracies.

The following should work:

library(rgdal)
xy <- data.frame(N = 60, E = 27)
coordinates(xy) <- ~ E + N
proj4string(xy) <- CRS("+proj=longlat")
spTransform(xy, CRS("+init=epsg:3067"))

and it is really useful to validate the results...

Cheers, Jari Oksanen (Finland)
-----Oorspronkelijk bericht-----
Van: r-sig-ecology-bounces at r-project.org [mailto:r-sig-ecology-bounces at r-project.org] Namens Mauricio Zambrano-Bigiarini
Verzonden: mercredi 20 mars 2013 09:29
Aan: r-sig-ecology at r-project.org
Onderwerp: Re: [R-sig-eco] Conversion of lat/long coordinates to ETRS89

On 20/03/13 08:33, Daniel Fl? wrote:
Hi,

We have several lat/long coordinates for Finland that we would like to convert into a selected projection (such as ETRS89/ETRS-TM35FIN or other).
Could someone inform us about what package and function we should use to batch converte, and details in the procedure we should be aware of?
?rgdal::spTransform

r-sig-geo is a better place for more specific questions.

Kind regards,

Mauricio Zambrano-Bigiarini

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We do not have additional information to the lat/long coordinates, but this is may be not necessary?

Daniel Fl?
PhD Fellow, Forest Health
The Norwegian Forest and Landscape Institute Pb 115, NO-1431 ?s
Office:   (+47) 64 94 90 28
Mobile: (+47) 91 14 52 74
Skype:    floe.daniel
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Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland

Conversion of lat/long coordinates to ETRS89

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