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What is the South African coordinate reference system?
Since 1st January 1999 the official coordinate system for South Africa is the Hartebeesthoek94 geodetic datum but referencing the WGS84 ellispoid with the International Terrestrial Reference Frame 1991 coordinates of the Hartebeesthoek Radio Astronomy Observatory Telescope used as the origin of this system.
Why all maps are wrong?
All maps lie. Maps and globes, like speeches or paintings, are authored by humans and are subject to distortions. These distortions can occur through alterations to scale, symbols, projection, simplification, and choices around the map’s content.
Which is the South African coordinate reference system?
Most GIS software now implements the South African CRS (SACRS; incorrectly but popularly known as the “LO” system) which is based on south-oriented (or south-facing) transverse mercator (TMSO). The EPSG codes for these are:
Where does the co-ordinate reference system come from?
Prior to 1st January 1999, the co-ordinate reference system, used in South Africa as the foundation for all surveying, engineering and georeferenced projects and programmes, was the Cape Datum . This Datum was referenced to the Modified Clarke 1880 ellipsoid and had its origin point at Buffelsfontein, near Port Elizabeth.
Where can I get south oriented TM coordinates?
You’ll get south-oriented coordinates from land surveyors or CAD exports, but in practice most GIS practitioners use north-oriented (or ‘north-facing’ or ‘east-north up’) transverse mercator. So, here are some definitions you can use for north-oriented TM, as well as some for Albers, and some other CRS guidelines for southern Africa.
How does a Coordinate Reference System ( CRS ) work?
A coordinate reference system (CRS) then defines, with the help of coordinates, how the two-dimensional, projected map in your GIS is related to real places on the earth.