[R] Steps to create spatial plots

[lily li]

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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>> >
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