[R-sig-Geo] Convert LL to UTM

[Roger Bivand]

On Mon, 14 Jan 2008, Dylan Beaudette wrote:

> or see the Proj4 library and utilities- outside of R

I.e.:

function project() in the rgdal package. Mauro wrote to me off-list ten 
days ago and got a reply:

"Please read the help page for the project function (?project) in the 
rgdal package carefully. There are no variables being projected, only a 
matrix of point coordinates. The function you quote was for a completely 
different situation. If your input data are not points in geographical 
coordinates, see ?"spTransform-methods".

Please also write to the R-sig-geo rather than to me directly - 
maintainers can help with bugs in software, but the list will give faster 
and perhaps better response."

At least he read the second paragraph, but probably not the first. I agree 
that reading the proj4 documentation would help too, but so far we don't 
know enough - only that the input coordinates seem to be geographical.

Roger

>
> Dylan
>
> On Monday 14 January 2008, Dale Steele wrote:
>> require(PBSmapping)
>> ?convUL
>>
>> for example ...
>>
>> points <- data.frame(cbind(data$idnum, data$long, data$lat, data$var))
>> colnames(points) <- c("EID", "X", "Y", "var")
>> attr(points, "projection") <- "LL"
>>    ## Define as EventData
>> points <- as.EventData(points)
>>   ## Transform to UTM (Euclidean) coordinates, uses package PBSmapping
>>  convUL(points, km=TRUE)
>>
>> On Jan 14, 2008 6:29 PM, Mauro Sznelwar <sznelwar at uol.com.br> wrote:
>>>  How can I do to transform geographic coordinates in UTM, I want to
>>> transform a column of latitude and longitude in decimal geographic
>>> coordenates to UTM. I know pages that convert  each value, but I want to
>>> do a whole variable (column)! Mauro Sznelwar - MSc Student of São Paulo
>>> University, Brazil, in the fields of Geoprocessing [[alternative HTML
>>> version deleted]]
>>>
>>>
>>> _______________________________________________
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>>> R-sig-Geo at stat.math.ethz.ch
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
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>
>
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no