Hi Roger,
sorry for troubling and thanks for the very quick answer.
I did follow the guidelines from the CRAN page
# setRepositories(ind=1:2)
# install.packages('rgdal'),
but it did not work.
I was successful, however (with the same to lines of code), after
shutting down and restating R...
============================================================
Gabriele Cozzi
Institute of Evolutionary Biology and Environmental Studies
Zurich University
Winterthurerstr. 190
8057 Zurich - Switzerland
E-mail: gabriele.co...@uzh.ch
Phone: ++41(0)44 6356116
Fax: ++41(0)44 6355711
http://www.ieu.uzh.ch
http://african-carnivores.com
Botswana Predator Conservation Trust
Private Bag 13
Maun - Botswana
E-mail: gab.co...@gmail.com
Mobile: +26774259312
http://www.bpctrust.org
On 17.05.2012 10:06, Roger Bivand wrote:
On Thu, 17 May 2012, Gabriele Cozzi wrote:
Dear all,
I am having issues installing the package "rgdal" on a Mac OS X (Lion).
# install.packages("rgdal")
actually says that there is no available package for R 2.15.0 (the
version I am using at the moment). Yet I can successfully load the
rgdal package on my old PC (also running R 2.15.0). Does it means
rgdal is not implemented for mac? I find it hard to believe.
Did you read the CRAN package page for rgdal? If you did, did you do
what it said:
setRepositories(ind=1:2)
install.packages('rgdal')
to install from CRAN Extras?
Don't jump to conclusions, do try to use the resources available to
reach well grounded solutions.
We still hope that rgdal and rgeos will be available as regular CRAN
packages for OSX, but this seems to have stranded (again).
Roger
Any help would be appreciated.
Best,
Gabriele
============================================================
Gabriele Cozzi
Institute of Evolutionary Biology and Environmental Studies
Zurich University
Winterthurerstr. 190
8057 Zurich - Switzerland
E-mail: gabriele.co...@uzh.ch
Phone: ++41(0)44 6356116
Fax: ++41(0)44 6355711
http://www.ieu.uzh.ch
http://african-carnivores.com
Botswana Predator Conservation Trust
Private Bag 13
Maun - Botswana
E-mail: gab.co...@gmail.com
Mobile: +26774259312
http://www.bpctrust.org
On 17.05.2012 09:15, Roger Bivand wrote:
On Thu, 17 May 2012, Hodgess, Erin wrote:
Hello again.
I'm having a little bit of trouble with spTransform (probably I'm
doing it wrong), but here is what I'm doing:
Original data frame with UTM locations near Phuket, Thailand:
test1.df
Loc east north
1 a 748.168 602.861
2 b 754.302 615.609
proj1 <- CRS("+proj=utm +zone=47N")
Your points are 750m east and 600m north of the given projection
origin. If you meant km, set the units by adding +units=km to the
proj4string. However, this gives me:
coordinates Loc
1 (101.24, 5.44994) a
2 (101.295, 5.56496) b
which is not on Phuket, so something else is wrong here. Do you know
definitely that the input coordinates are UTM zone 47? Reversing the
eastings and northings gets a bit closer:
proj1 <- CRS("+proj=utm +zone=47N +units=km")
coordinates(test1.df) <- c("north", "east")
proj4string(test1.df) <- proj1
spTransform(test1.df, CRS("+proj=longlat +datum=WGS84"))
coordinates Loc
1 (99.9308, 6.7677) a
2 (100.046, 6.82295) b
but isn't there yet (reversed coordinate order does happen). What
was the source of the coordinates?
Roger
coordinates(test1.df) <- c("east","north")
proj4string(test1.df) <- proj1
Set up a spatial data frame
test1.df
coordinates Loc
1 (748.168, 602.861) a
2 (754.302, 615.609) b
spTransform(test1.df, CRS("+proj=longlat +datum=WGS84"))
coordinates Loc
1 (94.518, 0.00543748) a
2 (94.518, 0.00555246) b
Now the answers should be about 8 degrees north and 98 degrees East.
Any suggestions would be most appreciated.
Sincerely,
Erin
Erin M. Hodgess, PhD
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: hodge...@uhd.edu
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