[R-sig-Geo] problem extracting Z value from line shapefile

[zbynek.janoska at centrum.cz]

Hello,

I have following problem:
I wish to extract z coordinates from a polyline shapefile. Using readOGR() i
get following:

> data <- readOGR(path,'tesikov')
OGR data source with driver: ESRI Shapefile 
Source: "C:/Users/Janoska/Documents/GPS", layer: "tesikov"
with 1 features and 1 fields
Feature type: wkbLineString with 3 dimensions
Warning message:
In readOGR("C:/Users/Janoska/Documents/GPS", "tesikov") :
  Z-dimension discarded

Clearly, Z dimension is stored in the data, but readOGR does not read it.
Hence, I followed this post:
https://stat.ethz.ch/pipermail/r-sig-geo/2007-March/001847.html

data <- coordinates(readShapeLines('path/tesikov.shp'))
> str(data)
List of 1
 $ :List of 1
  ..$ : num [1:335, 1:2] -540376 -540369 -540361 -540353 -540344 ...

Resulting coordinates have only two dimensions.

I am wondering, whether Z dimension can be extracted only from points?

Any suggestion would be appreciated.

Thanks,
Zbynek



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