(7) + (8) + (9) Maps Flashcards
1
Q
Types of maps
A
- Planimetric
- Topographic
- Thematic
2
Q
Planimetric
A
2D view of the earth from above
3
Q
Topographic
A
- 3D shape of earth’s surface from above
- Use contour lines (equal elevation) to show topology
- May also include planimetric map features
4
Q
Thematic
A
- Highlights some particular information
- Geologic maps (Distribution of rocks units, Soil types, Natural hazards, Groundwater information)
5
Q
All maps have a ___ to compare size on earth to the size on the map
A
Scale
6
Q
Scale Types
A
- Fractional Scale
- Graphic Scale
- Verbal Scale
7
Q
Fractional Scale
A
- Ratio
- Actual distance on the ground on the map between any two points
- Common scales (1:50 000) (1:20 000) (1:100 000) (1:250 000)
8
Q
Graphic Scale
A
- Line or bar indicated the relationship between the distance on the map and actual distance on the ground
9
Q
Verbal Scale
A
- Words express relationship
o 1 inch = 24 000 inches
10
Q
Directional Indicator
A
- North arrows
- Government topological maps: N is parallel to L and R sides of map
- But not the blue grid!
11
Q
Earth’s magnetic Pole
A
- Compasses point to it
- Earth’s magnetic pole is constantly changing in position
- Magnetic declination
o Angle (degrees, minutes, sec) between true N and magnetic N
o Adjust compass manually to account for magnetic declination
o Correction shown on government maps
12
Q
Finding Directions
A
- Indicate direction from one point to another
- Measuring in degrees
- Use protractor to measure from a map
- Use a compass to measure on the ground
- Express as azimuth or quadrant bearing
13
Q
Azimuth
A
- Number of degrees clockwise from north
- 000deg to 360deg
- Three-digit number
14
Q
Quadrant Bearing
A
- Four quadrants NE, NW, SE, SW
- Angle from North or South to East or West
- Acute angle
15
Q
Must know how to express Latitude and longitude, UTM, and public land survey co-ordinates
A
:)
