Coordinate Systems and South African Coordinate Systems

Short presentation on coordinate systems

1. Coordinate Systems & Projections

2. Agenda What Are They? Geographic Coordinate Systems Projected Coordinate Systems South African Coordinate Reference System Demonstration

3. Coordinate Systems – What are they? Method to ID location of a point on Earth. Coordinates?? What do they indicate? Some mathematics involved Basic Elements – Choice of…… Origin (0,0) – Reference point - Central Meridian ?? Axes (X,Y) – What do X & Y indicate ?? Positive direction for each axis Unit vectors at every point in space

4. Coordinate Systems cont. Spherical Coordinate Systems Latitude Longitude Cylindrical Coordinate Systems Cartesian Coordinate Systems Planar – 2D Metres

5. Agenda What Are They? Geographic Coordinate Systems Projected Coordinate Systems South African Coordinate Reference System Demonstration

6. Geographic Coordinate Systems Datum? Ellipsoid? Geoid?

7. Projected Coordinate Systems Map Projections - mathematical equations used to transform latitude and longitude coordinates to plane coordinates Transverse Mercator? Central Meridian Latitude of Projection Origin Scale Factor at Central Meridian Standard Lines

8. South African Coordinate Systems Cape Datum 1880 Hartebeeshoek 1994 WGS 1984 Transverse Mercator

9. Transformations Transform from one projection to the other Cape to Haartebeeshoek , vice versa Hartebeeshoek to WGS, vice versa Difference?

10. Demonstration Recognising Coordinates Are we in the right place? How do we know?

11. https://www.caliper.com/glossary/what-is-a-coordinate-system.htm http://gis.humboldt.edu/OLM/Lessons/GIS/03%20Projections/IntroductionToCoordinateSystems1.html https://mgimond.github.io/Spatial/chp09_0.html https://gisgeography.com/central-meridian/ https://www.e-education.psu.edu/natureofgeoinfo/c2.html