Coordinate Systems: UTM and Beyond Flashcards
What measurement does UTM use?
Meters
Is UTM 2-D or 3-D?
UTM is 2-d planar! Long and lat is 3-D polar!
What projection does the UTM use?
Transverse Mercator projection.
What degree North and South does UTM cover?
84 degrees N and 80 degrees S
Universal Transerve Mercator:
coordinates define 2 dimensional, horizontal positions.
What degree wide is each UTM zone?
6 degrees wide
What does each zone have?
A central Meridian!
Whats the case with eastings?
eastings are measured from the central meridian eastwards. However eastings increase eastward from the central meridian which is given a false easting of 500 km so that only positive eastings are measured anywhere in the zone.
Whats the case with northings?
Northings increase northward from the equator with the equators value differing in each hemisphere. In the northern hemisphere the equator has a value of 0. Four southern hemisphere locations the equator is given a false northing of 10,000km.
degrees and measurements of a zone!
zone is 6 degrees wide! The distance between line of longtidue (width of a degree of latitude) at equator is 111km approximately so zone is never more than 666,000 meters wide.
How many zones?
60!
What zone does Saskatchewan use?
zone 13!
UTM coordinates consist of 4 pieces of information.
- ) The hemisphere, north or south.
- ) The UTM zone, a number between one and 60
- ) An easting, a positive number with 6 digits.
- ) A northing, a positive number with 7 digits.
For easting and northing it is always…..
Positive number!
what geographic coordinate system does NATO use?
Military Grid Reference system
Military Grid Reference system degrees.
6 degrees East-West and 8 degrees north-south
Regional Reference systems:
- ) Transverse Mercator
- ) Universal Polar Stereographic (UPS)
- ) State plane coordinate system (CLSS)
- ) Canada Land Survey System (CLSS)
- ) Public Land Rectangular Survey (USPLS)
What regional reference system is used to identify public islands?
Public land rectangular survey
Cartesian Coordinates:
Coordinates incidicating location in a space defined by 2 baselines intersecting one another at right angles. The intersection point is the origin for location defined by distances along the 2 intersecting axes.
Geodesy;
The science of earths shape and size. Also related to measuring the various gravitational force excerted by earth.
Geodetic Datum:
A definition of the size, shape and orientation of the earth; datums support the development of global reference and mapping systems.
Geoid:
A model of the earths surface (shape) based on the variable gravitational force exerted by the earth as an object.
