[R] Steps to create spatial plots
Eric Berger
ericjberger at gmail.com
Tue Jan 16 08:36:21 CET 2018
If layer$z is a matrix and you want to reverse the order of the rows, you
can do:
n <- nrow(layer$z)
layer$z <- layer$z[ n:1, ]
HTH,
Eric
On Tue, Jan 16, 2018 at 8:43 AM, lily li <chocold12 at gmail.com> wrote:
> Sorry for the emails, I just wanted to have an example.
> layer$z
>
> 1 1 3 4 6 2
> 2 3 4 1 2 9
> 1 4 5 2 1 8
>
> How to convert the matrix to layer$z = c(1, 4, 5, 2, 1, 8, 2, 3, 4, 1, 2,
> 9, 1, 1, 3, 4, 6, 2)?
> I think this vector is the order that levelplot can use. Thanks again.
>
>
> On Mon, Jan 15, 2018 at 10:58 PM, lily li <chocold12 at gmail.com> wrote:
>
> > Hi Bert,
> >
> > I think you are correct that I can use levelplot, but I have a question
> > about converting data. For example, the statement:
> > levelplot(Z~X*Y), Z is row-wise from the lower left corner to the upper
> > right corner.
> > My dataset just have gridded Z data as a txt file (or can be called
> > matrix?), how to convert them to the vector in order for levelplot to
> use?
> > Thanks.
> >
> > On Mon, Jan 15, 2018 at 6:04 PM, Bert Gunter <bgunter.4567 at 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 <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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> >>> >
> >>> >
> >>> > --
> >>> > In God we trust, all others bring data.
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