location how do you describe where you are?. relative location explaining where something is in...
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LocationHow do you describe where you are?
Relative LocationExplaining where something is in relation to something else
Use compass directions to describe location relative to something else
http://en.wikipedia.org
Relative Location
The US is south of Canada
Ohio is west of Pennsylvania
Nebraska is northeast of Colorado
http://www.freeworldmaps.net
Absolute LocationExplaining where something is using a coordinate system
Absolute LocationExplaining where something is using a coordinate system
Address 1666 West 29th Street, Erie, PA
Latitude Longitude Systemgeographyalltheway.com
Based on a Sexagesimal system first used by Sumerians
Places the earth on a coordinate plane
geographyalltheway.com
Latitude and Longitude lines are a grid map system. But instead of being straight lines on a flat surface, Latitude and Longitude lines encircle the Earth, either as horizontal circles or vertical half circles
POSITIONING IN MGRS
The Military Grid Reference Systems (MGRS) is an alpha-numeric system for expressing coordinates. A single alpha-numeric value references a position that is unique for the entire earth.
Based on the Universal Transverse Mercator (UTM) grid system
Places the earth in the positive quadrant of a coordinate plane
Based on a decimal system
15SWC8081751205
The first two characters represent the 6° wide UTM zone.
◦Leading zeros are included so that Zone 9 is “09”.
◦For polar areas outside the UTM area, these characters are omitted
http://earth-info.nga.mil
15SWC8081751205
The third character is a letter designating a band of latitude.
◦ Beginning at 80°S and preceding northward, the 20 bands are lettered C through X, (omitting I and O)
◦ The bands are all 8° high except band X, which is 12° high.
◦ Outside the UTM are, A and B are used near the South Pole, Y and Z near the North Pole
http://earth-info.nga.mil
15SWC8081751205http://earth-info.nga.mil
The vertical UTM boundaries and horizontal latitude band boundaries form (generally) 6° X 8° Grid Zones. Hence, the first three characters of the MGRS value, e.g. “15S”, are referred to as the Grid Zone Designator (GZD)
15SWC8081751205http://earth-info.nga.mil
The fourth and fifth characters are a pair of letters identifying one of the 100,000-meter grid squares within the grid zone (or UPS area).
The remaining characters consist of the numeric Easting and Northing values within the 100,000-meter grid square
http://earth-info.nga.mil
15SWC8081751205
The first half refer to the EastingThe second half refers to the Northing
http://earth-info.nga.mil
15SWC8081751205
MGRS coordinates may be rounded to reflect lesser refinement. For example:
◦15SWC8081751205 is at 1-meter refinement.◦15SWC80825121 is at 10-meter refinement.◦15SWC808512 is at 100-meter refinement.◦15SWC8151 is at 1000-meter refinement.◦15SWC85 is at 10,000-meter refinement.