Module Three - Coordinate Systems, Measurements, and Route Selection Flashcards
Geo - Reference
Used to identify a specific geolocation
Coordinate System - GPS
Used to identify the location of features on earths surface
Reference Grids
Most simplistic reference grid
map divided into grids and rows
How many coordinate systems are there
6
Gazetteer
Fancy word for index
What is the simplest grid
Reference system
Lat/Long Positions - Geographic coordinate systems
Measured in degree, minutes, and seconds
Geographic coordinate system
Lat/Long Positions
Lat/Long Position has a system used to simplify it - what is that system?
The world geographic reference system
The world geographic reference system
The earth is divided into 15 degree wide quadrants, north-south starts at 90 south & east - west starts at 180
WGRS east and west zones are labeled by what
A thought Z minus O and I
WGRS north and south zones are labeled by what
A thought M and no I
How many quadrants are there in the WGRS
288
What does MK LK 385250 make up
It is a simplified code for the WGRS the letters are for degrees and the numbers equal minutes and seconds
MK LK 38.5 (minutes) 25.0 (seconds)
Read right then up stands for what
How to read the geocode based on numbers and relation to the map
Geodetic
Survey grid take into account the earth surface
Plane rectangular grid
Doesn’t take into account the earth surface, doesn’t have to because only works with a small area of the earth surface
Cartesian coordinate system
X is east/west direction
Y is north/south
4 quadrant system - stays in the system that focus on postive only
Geographic coordinate system doesn’t deal with what
NEGATIVES
Universal transverse system
Minimal distortion rate
60, 6 degree zones - starting at 180 degree long, runs eastward
Spans 80 degrees south to 84 degrees north (more landmasses in the north)
Transverse
Extending across something.
True or False, there are two version of the UTS
True
Military and civilian
How does the UTS determin cordntes
By using Northing and Eastings in METERS, from the ORIGIN point (0,0) - quad 1,
How do we make sure the UTS is positive
Make sure quadrants are positive, has to be up (north) and to the east
C UTM
False origin - 500,00 meters west of central meridian of each zone
NH - origin is the equator
SH - origin 10,000,000 meters south of the equator
UTM
Zones are arbitrary,
when zones are split between two quadrants, special arrangements are made
M UTM
Almost identical to C UTM except for designation of grid system, HANDLES the arctic
8 degree sections - rows are labeled c - x, no I or O
North Pole = y + Z
South Pole = A + B
Only the circle of the pole