rgdal, PROJ6 and "+init=epsg" syntax on Jupyter/conda

On 9/12/19 10:55 AM, James Sample wrote:

Thanks Edzer - that's very helpful!

Would it be possible for you to link/share your Ubuntu Dockerfile, please?
(I completely understand if you'd rather not, of course).

https://github.com/r-spatial/sf/tree/master/inst/docker/gdal

Perhaps if I can see how you're setting thing up in Ubuntu I can modify my
Jupyter Dockerfile accordingly, and if I can convince myself that this is a
actually conda-forge/build issue (rather than my own mistake) I can open an
issue on the conda r-rgdal feedstock (
https://github.com/conda-forge/r-rgdal-feedstock).

Great, please also report back here!

Thanks again for your help!

Best wishes,


James.



On Wed, 11 Sep 2019 at 23:10, Edzer Pebesma <edzer.pebesma at uni-muenster.de>
wrote:

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.

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

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