[R] Steps to create spatial plots

[Adriano Fantini]

the latest ggplot from github (to be installed with
`devtools:install_github()`) has support for SF objects too, it's a treat!
However, sf is not exactly designed for raster data. Of course you can make
each of your cells be a square polygon, but it's not the most efficient way
for big datasets. For this the `raster` (excellent and rock stable) and
`stars` (even more excellent, but in heavy development) can be used.

Adriano Fantini

2018-01-15 23:26 GMT+01:00 Roman Luštrik <roman.lustrik at gmail.com>:

> 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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