Skip to content

Extract the coordinates of a Polylines

3 messages · javad bayat, David Winsemius

Original
javad bayat
# 
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 at data$Elevation

Sincerely.
4 days later
javad bayat
# 
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 at lines[[1]]@Lines[[1]]@coords###Extracting X and Y coordinates
of the polylines of topo

head(topo at 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

How can I do this.
Sincerely.
On Sat, Jan 26, 2019 at 9:37 AM javad bayat <j.bayat194 at gmail.com> wrote:

            

      
      
      
    

        

  
    

      
      
    

  


  


      

    

    
1 day later

    

      
      

        


  

        

      David Winsemius
    

    

      
      #
    

  


  

      
On 1/30/19 7:12 AM, javad bayat wrote:

            

      
      
      
    

        
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 at data) )` if you want more informed comments.


David.