GEOG 222.3 Lecture Notes - Lecture 2: Geodetic Datum, Geoid, World Geodetic System
Document Summary
* the earth is tilted on the angle of 23. 5 degrees. 33. 5 latitude, where you will see the sun right above with no shadows. When is the earth closest to the sun - january, because of the tilt of the earth. Elevation of saskatoon is about 400-500m above sea level. Earth is in motion which makes the equator bigger. If you focus on one location it makes it more accurate the the others to measure the height. You have to have a reference point. Geoid - reference surface point represents the mean sea level years of data) This is based on the calculation on the hourly mean of the water elevation (19. Geoid - is the reference point ( theoretical sphere of the earth ) The geoid and ellipsoid can be the same at some point and di erent at others. Datum - is a reference point, surface, or axis an object against which measurements are made.
