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 <[EMAIL PROTECTED]> 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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--
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: [EMAIL PROTECTED]
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