[R-sig-Geo] EPSG codes for LO31 WGS84 projection data

Wesley Roberts wroberts at csir.co.za
Wed May 6 11:32:05 CEST 2009

Thanks Paul,

I did find the mailing list and am using the following proj4 definition for both my shapefile and imagery data. It seems to work in R so I am happy with the result.

+proj=tmerc +south +ellips=WGS84 +datum=WGS84 +lon_o=31 +k_0=1 +units=m +no_defs

As per usual I found the solution no long after posting to this list. In future I will post to an imaginary list :-) and hopefully the answer will follow.

Many thanks,
>>> Paul Hiemstra <p.hiemstra at geo.uu.nl> 05/06/09 10:41 AM >>> 
Hi Wesley,

A good source of information in regard of projections is the proj4 
mailing list:



Wesley Roberts wrote:
> Dear Colleagues,
> I have a data set which is projected using the following projection, Hartebeeshoek94 Projection Gauss Conform LO31. This is a local projection used in South Africa. So far, I have only been able to find the EPSG code for the projection from http://spatialreference.org/ref/epsg/2054/ . I am actually looking for the Proj4 definition as the library in rgdal does not contain any information regarding the projection. Using the following command I found no information for the specified code
>> poly <- readShapePoly("PCA_AreaOne_2_water_EPSG.shp", IDvar="cat", proj4string=CRS("+init=epsg:2054"))
> Error in CRS("+init=epsg:2054") : no options found in 'init' file
> Could someone please provide me with the full proj4 definition as the spatial reference site does not seem to have it.
> Many thanks and kind regards,
> Wesley
> Wesley Roberts MSc.
> Researcher: Earth Observation (Ecosystems)
> Natural Resources and the Environment
> Tel: +27 (21) 888-2490
> Fax: +27 (21) 888-2693
> "To know the road ahead, ask those coming back."
> - Chinese proverb

Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri

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