[R-sig-eco] Conversion of lat/long coordinates to ETRS89

[Jari Oksanen]

Daniel,
On 20/03/2013, at 10:45 AM, Levy, Yair wrote:

> 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 Flø 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 Flø
>> PhD Fellow, Forest Health
>> The Norwegian Forest and Landscape Institute Pb 115, NO-1431 Ås
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-- 
Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland