[R-sig-Geo] R Help

[Andres Diaz Loaiza]

Dear Esu,

About your question there is huge literature already written.

I recommend to read the sp package manual.

An example for extract the coordinates you can  find it here:

https://gis.stackexchange.com/questions/43543/how-to-calculate-polygon-centroids-in-r-for-non-contiguous-shapes

If you want to see how works the function remember that r is an open source
code and you can find the original functions over the binaries repositories
or compressed packages.

All the best,

Andres


On Thu, 20 Dec 2018 at 22:58, Esu Esu via R-sig-Geo <r-sig-geo using r-project.org>
wrote:

> Dear All,
> I am new to R-programming. I have question if anyone can help me with:Q:
> how can I create functions in R to compute the area (A), centroid (Cx and
> Cy) and perimeter (P) of a polygon list .  I want to write R functions to
> compute these quantities for individual polygons, as well asan overall
> function to take a polygon list and return a data frame with four columns
> and the samenumber of rows as polygons in the list.  Each quantity
> should correspond to each column. it is (sp) class object.
> Hope to find any suggestion or answer
>  RegardsMuhsien
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>
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-- 
Andrés D.

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