[R] Steps to create spatial plots

[Bert Gunter]

>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 <chocold12 at 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.lustrik at 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 <chocold12 at 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.
> >>
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> >
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