Thanks Simon. I have other vectors in the CSV file so after naming my
latitude and longitude x and y, I tried this. The first two lines run fine
but I get error in the second line.
r <- raster(as.matrix(F1))
extent(r) <- extent(xmin, xmax, ymin, ymax)
F1<-data.frame(x, y,z)
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "extent", for signature
"stand
Thankyou.
Belay
On Sat, May 19, 2012 at 12:22 PM, Simon Knapp <sleepingw...@gmail.com>wrote:
> provided you get the call to read.table (or perhaps read.csv) right
> and presuming that file contains only the image data, you should
> be able to say:
>
> r <- raster(as.matrix(read.csv("file.csv")))
> extent(r) <- extent(xmin, xmax, ymin, ymax)
>
> and not worry about the projection (if it is plain old decimal degrees)
>
> Regards,
> Simon
>
> On Sat, May 19, 2012 at 7:49 PM, Belay Gebregiorgis <belay...@gmail.com>
> wrote:
> > Hello everyone,
> >
> > I want to get a 1km by lkm grid raster image using my csv data. If I call
> > latitude=a, longitude=b and preciptation=c.
> >
> > a<-(1,2,3,4,5)
> > b<-(6,7,8,9,10)
> > c<-(10,20, 30,40, 50)
> >
> > Then I found an example in r help which goes like
> >
> > pts = read.table("file.csv",......)
> > library(sp)
> > library(rgdal)
> >
> > proj4string(pts)=CRS("+init=epsg:4326") # set it to lat-long
> > pts = spTransform(pts,CRS("insert your proj4 string here"))
> > gridded(pts) = TRUE
> > r = raster(pts)
> > projection(r) = CRS("insert your proj4 string here")
> >
> > Because I am new to R, I have no idea what to put into the proj4 string
> and
> > all that. Can anyone help me on this? If there is a different way of
> doing
> > this, that is also fine.
> >
> > Kind Regards,
> >
> > Belay
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> > and provide commented, minimal, self-contained, reproducible code.
>
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