Maps Flashcards
1
Q
What are maps?
A
- visual representation showing relationships between and among objects and/or concepts
2
Q
Maps - Simple definition
A
Relationship between/ among places. Way of navigating concepts & places
3
Q
3D -> 2D Pros @ Cons
A
- Highlights and hides aspects of reality
- Maps hide a whole spatial dimension
4
Q
Mercator projection (1569)
A
- every line is constant direction
- lines of latitude and longitude stay orthogonal
5
Q
Sanson-Flamsteed sinusoidal projection
A
Continents proportional
More distorted (wide at equator)
6
Q
Mercator Pros
A
Sailing made it popular. Kept lines of longitude parallel
7
Q
Mercator Cons
A
Lines are parallel causing lots of distortion away from the equator
8
Q
Authograph Projection
A
- Most accurate
- Distortion in ocean (better as we live on land)
- Little distortion on land
9
Q
Map in 1700s
A
- simple and local
- track minerals and resources
- no symbols
10
Q
Connecting rock layers
A
- William Smith
- Steno’s lateral continuity and superposition
11
Q
Smith’s Map
A
- maps as a tool to organize
- organize fossils (strata) from bottom to top
- slanted land layers
12
Q
Geologic Map Purposes
A
- elevation/topography (lay of the land)
- geology at the surface (interpolated)
- subsurface geology (interpretation, extrapolation)
- time/ history (substituting space for time
- connects areas together
13
Q
Features of Present Geological Maps
A
- 3D structures on 2D surface (strata, fault planes, folds, intrusions, foliation)
- Topography (contour lines)
- Rock types (colours)
- Stratigraphic sequence (rock descriptions in legends)
- Structure ( sequence of events constructing the story of the area)
14
Q
Dip
A
The slope of a dipping bed (inscriptions)
15
Q
Strike
A
Line perpendicular to slope and parallel to bedding surface (inscriptions
