[R] Steps to create spatial plots

[lily li]

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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