![]() That is rather odd, if planar coordinate reference systems Longitude/latitude coordinates are sometimes referred to as “geographic”Ĭoordinates. They are longitude/latitude relative to the WGS84 datum. That does not tell us much they typically mean to say that Sometimes people say that their coordinates are So the basic way to record a location is a coordinate pair in degreesĪnd a reference datum. Other, local datumsĮxist to more precisely record locations for a single country or region. Similar to NAD83 (The North American Datum of 1983). Used datum is called WGS84 (World Geodesic System 1984). More complexĭatums allow for more variation in the earth’s shape. Is “flattened” at the poles and bulges at the equator). The simplest datums are a spheroid (a sphere that To do so, you need a model of the shape of the earth. Obviously we cannot actually measure these angles. Of constant longitude) to a meridian that passes through the point. \(\lambda\) (lambda) is the angle from a reference meridian (lines Passes through a point and the center of the Earth. Of a point is the angle between the equatorial plane and the line that This is anĪngular coordinate reference system. Reference system for geographic data is longitude/latitude. ![]() The earth has an irregular spheroid-like shape.
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