[R] converting csv to image file

[Simon Knapp]

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 <belayg12 at 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
>
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>
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