The projection is UTM zone, but I meant that I don't have coordinates for each grid cell, rather, I have coordinates for the upper left corner. The attribute layer is elevation for each grid cell for example, I assume that I need to create coordinates for the grid cells first? Thanks.
On Mon, Jan 15, 2018 at 6:04 PM, Bert Gunter <bgunter.4...@gmail.com> wrote: > 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/posti >> ng-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.