[OSGeo Africa] Reconstruction old SG diagrams

Gavin Fleming gavin at kartoza.com
Mon Feb 20 23:09:35 PST 2017


I got pretty close with a modified EPSG:22286 (south-oriented TM25 on 
Cape datum) by guessing an offset and converting to cape feet:

+proj=tmerc +lat_0=0 +lon_0=25 +k=1 +x_0=0 +y_0=2900000 +axis=wsu 
+a=6378249.145 +b=6356514.966398753 +towgs84=-136,-108,-292,0,0,0,0 
+to_meter=0.314858 +no_defs

Matching the local system is a matter of getting the offsets correct.

On 21/02/2017 08:02, Hanlie Pretorius wrote:
> Thanks to everyone who contributed.
>
> A land surveyor has volunteered to transform the coordinates and in
> the mean time I have georeferenced the diagrams to the existing data
> as best I can.
>
> Will be interesting to see how the two methods compare.
>
> Regards
> Hanlie
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