Datums [Jan. 2, 2012, 2:18 a.m.]
At the end of this lesson, you will be able to:
- describe what a datum is in your own words
- differentiate a sphere from an oblate spheroid
- calculate the ratio of equator to polar circumference of the earth
Topic Overview
- 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)