Intro to Coordinate Systems Flashcards
1
Q
Coordinates represent
A
a distance from a point of origin
2
Q
X, Y, Z coordinates represent what
A
horizontal distance from origin, vertical, and height above ground
3
Q
Shape of Earth
A
ellipsoid
4
Q
Graticule
A
network of intersecting lines (parallels/meridians) that are drawn on globes for reference
5
Q
Prime meridian
A
0 value for longitude in a GCS
is arbitrary but often Greenwich, UK
6
Q
What is the 0 value for latitude?
A
ALWAYS the equator
7
Q
4 components of a GCS
A
- datum
- spheroid
- prime meridian
- angular units of measure
8
Q
To compare global data, what type of spatial reference should be used?
A
Earth-centered datum
9
Q
When to use a cylindrical projection
A
map areas that extend north to south
10
Q
When to use a conic projection
A
maps that extend east to west
11
Q
When to use an azimuthal projection
A
maps that have equal extent in all directions
