- Map Scale
- What is it?
- ratio
- "reduction/expansion factor"
- refers to horizontal distance (not slope)
- large scale vs small scale
- Generalization
- loss of detail
- need to maintain critical features & character
- reason: smaller scale, "simpler purpose"
-
- selection/ elimination (omit unimportant)
- combination/ aggregation (merge adjacent features)
- simplification (reduce detail, maintain shape)
- displacement (locational shift)
- exaggeration or reduction (symbology)
- smoothing (digital maps)
- 3 Ways to Express
- Representative Fraction
- Word Statement
- Scale Bar
- Units
- Metric
- mm, cm, m km
- Imperial
- in, ft, yd, mi
- Conversions
- 2.54 cm = 1 in
- 63,360 in = 1 mi
- Example Questions
- scale given, solve for unknown distance
- 1:50,000 3.2cm on map ...
- 1:20,000 500m ground ...
- curved line?
- map & ground distances given, solve for scale
- 5 inches = 6,600 feet ...
- 2 maps, one with unknown scale
- map A 1:10,000
- map B unknown scale
- 2cm on map A = 0.4cm on map B
- scale of map B ...
- map A 1:50,000 map B 1:250,000
- will a river have the same length on both maps?
