Datums
At the end of this lesson, you will be able to:
- describe what a datum is in your own words
A Datum is the distance an ellipsoid is from the Earth's center. E.g. 'sea level' could be considered a datum (although sea leve tends to bulge with relation to the Moon's gravity).
Related Topics
- Point of reference
- Clarke 1866
- NAD27
- NAD83
- GRS80
- WGS84
- Map Scale
- representative fraction
- 1:40,000,000 (meters)
- Other common scales
Reference
- Wikipedia: Datum (Geodesy)