On Tue, 20 Sep 2016, 15:55 GwanSeon Kim <tateko...@gmail.com> wrote: > Hi, all > I am just beginner to use R. > I am working with TIF image file, and the information about the raster is > following: > > class : RasterLayer > dimensions : 11150, 21808, 243159200 (nrow, ncol, ncell) > resolution : 30, 30 (x, y) > extent : 569685, 1223925, 1513995, 1848495 (xmin, xmax, ymin, ymax) > coord. ref. : +proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 > +y_0=0 +datum=NAD83 +units=m +no_defs +ellps=GRS80 +towgs84=0,0,0 > data source : > > C:\Users\Gwan\AppData\Local\Temp\Rtmpg506Ee\raster\r_tmp_2016-09-14_122409_6260_09589.grd > names : test_map > values : 1, 225 (min, max) > attributes : > ID OBJECTID Value Red Green Blue Count Class_Name > Opacity > from: 0 2 1 1 0 0 5982503 Corn > 1 > to : 48 255 254 0 0 0 10336 Dbl Crop Barley/Soybeans > 1 > > > > >From this Rasterlayer, I want to convert raster to point for each pixel > based on "Value (one of column name)" and create a raster with > georeferenced information. > I used code as following: RP <- rasterToPoints(KY_raster) > However, I could not get the points and have an error message "cannot > allocate vector of size 5.4 Gb" and "Your computer is low on memory. Save > your files and close these programs". > Could someone please help me how I can convert to raster to points?? > Best, >
The First question is why? The point (centre)coordinates of every pixel are massively redundant since they are a simple function of cell index and the raster's extent. You might try as.data.frame with xy =TRUE to avoid any overhead in casting to Spatial, but still it's very likely that this is just a step towards your actual goal. Tell us what you want to do and I am sure there is a better way. Cheers, Mike > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Dr. Michael Sumner Software and Database Engineer Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.