[R] Extract the coordinates of a Polylines

[Michael Sumner]

Use ggplot2::fortify - there's several other ways but no "native" support.
If fortify doesn't work try spbabel::sptable.

All the best

On Fri, Feb 1, 2019, 05:46 David Winsemius <dwinsemius using comcast.net> wrote:

>
> On 1/30/19 7:12 AM, javad bayat wrote:
> > Dear all;
> > Back to my previous question, I am trying to add X and Y coordinates
> > to every row of the data.
> >
> > topo =
> >
> readOGR("E:/New/Modelling_Water/MIKE/BathyMetry/GIS_Armator/Chitgar_Topo.shp")#Read
>
> > shape file of the topo as polylines
> > plot(topo)
> > cords = topo using lines[[1]]@Lines[[1]]@coords###Extracting X and Y
> > coordinates of the polylines of topo
> >
> > head(topo using data)
> >   FID_     Entity       Layer Color   Linetype Elevation
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.0
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.5
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.5
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.5
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.5
> >     0 LWPolyline C-TOPO-MAJR     9 Continuous    1258.5
>
>
> I did a google-search on "lwpolyline" and it appears to be a structure
> that is created with AutoCAD. So it's unlikely that people who are
> primarily users of R's spatial data structures will know how rgdal
> (which is a layer on top of GDAL) will have implemented the importation
> of such a structure into R. You should instead provide the output of
> `dput (head(topo using data) )` if you want more informed comments.
>
>
> David.
>
> >
> > How can I do this.
> > Sincerely.
> >
> > On Sat, Jan 26, 2019 at 9:37 AM javad bayat <j.bayat194 using gmail.com
> > <mailto:j.bayat194 using gmail.com>> wrote:
> >
> >     Dear R users;
> >     I am trying to extract the X and Y coordinates of a polylines
> >     along with Elevation data. I have extracted the Elevations as Z,
> >     but I do not know how to extract the X and Y of these Elevations.
> >     Is it possible to extract X and Y of the Elevation and create a
> >     data frame with three variables?
> >
> >     line = readOGR("E:/......../Topo.shp")
> >     Z = line using data$Elevation
> >
> >     Sincerely.
> >
> >     --
> >     Best Regards
> >     Javad Bayat
> >     M.Sc. Environment Engineering
> >     Alternative Mail: bayat194 using yahoo.com <mailto:bayat194 using yahoo.com>
> >
> >
> >
> > --
> > Best Regards
> > Javad Bayat
> > M.Sc. Environment Engineering
> > Alternative Mail: bayat194 using yahoo.com <mailto:bayat194 using yahoo.com>
>
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>
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-- 
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia

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