[R-sig-Geo] rgdal, PROJ6 and "+init=epsg" syntax on Jupyter/conda

[Edzer Pebesma]

On an ubuntu docker image with gdal 3.0.1 and PROJ 6.2.0, I see:

> library(rgdal)
Loading required package: sp
rgdal: version: 1.4-6, (SVN revision (unknown))
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 3.0.1, released 2019/06/28
 Path to GDAL shared files:
 GDAL binary built with GEOS: FALSE
 Loaded PROJ.4 runtime: Rel. 6.2.0, September 1st, 2019, [PJ_VERSION: 620]
 Path to PROJ.4 shared files: (autodetected)
 Linking to sp version: 1.3-1
> CRS("+init=epsg:3035")
CRS arguments:
 +init=epsg:3035 +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000
+y_0=3210000 +ellps=GRS80 +units=m +no_defs

but also a warning with sf:

> library(sf)
Linking to GEOS 3.7.2, GDAL 3.0.1, PROJ 6.2.0
> st_crs("+init=epsg:3035")
Coordinate Reference System:
  No EPSG code
  proj4string: "+proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000
+ellps=GRS80 +units=m +no_defs"
Warning message:
In CPL_crs_from_proj4string(x) :
  GDAL Message 1: +init=epsg:XXXX syntax is deprecated. It might return
a CRS with a non-EPSG compliant axis order.

so it feels like a combination of how PROJ has been installed, and how
it has been compiled into the R packages.


On 9/11/19 9:38 PM, James Sample wrote:
> Dear all,
> 
> I am trying to setup R and rgdal within a JupyterLab environment alongside
> my usual Python tools. I realise this is probably an unfamiliar setup for
> many, but I hope someone might be able to help nevertheless.
> 
> I'm using a Docker container based on Ubuntu 18.04 and derived from the
> Jupyter Data Science Notebook (
> https://github.com/jupyter/docker-stacks/tree/master/datascience-notebook).
> I have Python 3.7 and R 3.6 installed, and I'm using "conda" as my package
> manager.
> 
> I have successfully installed GDAL and PROJ, together with various Python
> and R packages, including 'sp' and 'rgdal'. When I run
> 
>     require(rgdal)
> 
> I see the following
> 
> Loading required package: rgdal
> Loading required package: sp
> rgdal: version: 1.4-4, (SVN revision 833)
>  Geospatial Data Abstraction Library extensions to R successfully loaded
>  Loaded GDAL runtime: GDAL 2.4.2, released 2019/06/28
>  Path to GDAL shared files: /opt/conda/share/gdal
>  GDAL binary built with GEOS: TRUE
>  Loaded PROJ.4 runtime: Rel. 6.1.0, May 15th, 2019, [PJ_VERSION: 610]
>  Path to PROJ.4 shared files: (autodetected)
>  Linking to sp version: 1.3-1
> 
> 
> which seems OK. Most things work as expected, but this
> 
>     CRS("+init=epsg:3035")
> 
> gives an exception
> 
>     Error in CRS("+init=epsg:3035"): no arguments in initialization list
> 
> The same code works fine in R-Studio, although I note that my R-Studio
> installation has PROJ 4.9.2 (with the same versions of rgdal and sp as
> listed above). Unfortunately I can't downgrade PROJ, since some of my
> Python packages require version 6.1.
> 
> I have read that rgdal is compatible with PROJ6 and I haven't been able to
> find (m)any similar issues online, so I assume I'm doing something wrong.
> As a workaround, this runs successfully
> 
> showP4(showWKT("+init=epsg:3035"))
> 
> But the original syntax is cleaner and I'd rather not refactor all my old
> code if I can help it. Can anyone point me in the right direction, please?
> Is the "+init=epsg" syntax supported with PROJ 6, or should I be using an
> alternative?
> 
> Thanks and best wishes,
> 
> 
> James.
> 
> 	[[alternative HTML version deleted]]
> 
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> 

-- 
Edzer Pebesma
Institute for Geoinformatics
Heisenbergstrasse 2, 48151 Muenster, Germany
Phone: +49 251 8333081

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