From your description, I am **guessing** that you may not want a "spatial map" (including projections) at all, but rather something like a level plot. See ?levelplot in the lattice package for details. Both I am sure ggplot2 has something similar.
Apologies if I havemisunderstood your intent/specifications. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Mon, Jan 15, 2018 at 4:54 PM, lily li <chocol...@gmail.com> wrote: > Hi Roman, > > Thanks for your reply. For the spatial coordinates layer, I just have > coordinates of the upper left corner, numbers of rows and columns of the > spatial map, and grid cell size. How to create a spatial layer of > coordinates from this data? Thanks. > > > On Mon, Jan 15, 2018 at 3:26 PM, Roman Luštrik <roman.lust...@gmail.com> > wrote: > > > You will need to coerce your data into a "spatial" kind, as implemented > in > > `sp` or as of late, `sf` packages. You might want to give the vignettes a > > whirl before you proceed. > > Roughly, you will have to coerce the data to Spatial* (you could go for a > > point, raster or grid type, I think) and also specify the projection. > Once > > you have that, plotting should be handled by packages. > > > > Here are a few quick links that might come handy: > > > > https://cran.r-project.org/web/views/Spatial.html > > http://www.datacarpentry.org/R-spatial-raster-vector- > > lesson/10-vector-csv-to-shapefile-in-r/ > > > > > > Cheers, > > Roman > > > > On Mon, Jan 15, 2018 at 11:22 PM, lily li <chocol...@gmail.com> wrote: > > > >> Hi users, > >> > >> I have no clear clue about plotting spatial data. For example, I just > >> have a table with attribute values of each grid cell, such as elevation. > >> Then I have coordinates of the upper left corner in UTM, the number of > rows > >> and columns, and grid cell size. How to create spatial plot of > elevations > >> for the grid cells, in color ramp? Should I create a spatial grid layer > >> with all the polygons first? Thanks. > >> > >> -- > >> -- > >> You received this message because you are subscribed to the ggplot2 > >> mailing list. > >> Please provide a reproducible example: https://github.com/hadley/devt > >> ools/wiki/Reproducibility > >> > >> To post: email ggpl...@googlegroups.com > >> To unsubscribe: email ggplot2+unsubscr...@googlegroups.com > >> More options: http://groups.google.com/group/ggplot2 > >> > >> --- > >> You received this message because you are subscribed to the Google > Groups > >> "ggplot2" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an > >> email to ggplot2+unsubscr...@googlegroups.com. > >> For more options, visit https://groups.google.com/d/optout. > >> > > > > > > > > -- > > In God we trust, all others bring data. > > > > [[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. > [[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.