Maps, Projections, and Geographic Data Collection Notes

Understanding Maps and Projections

  • Distortion in Maps

    • When examining maps, remember that they are distorted representations of the globe.
    • Distortion affects direction, shape, area, or distance due to projecting a 3D object onto a 2D surface.

  • Types of Map Projections

    • Many map projections exist, each with specific characteristics and uses in geography.
Key Map Projections

  • Mercator Projection

    • A conformal projection excellent for displaying accurate directions.
    • Significant size and location distortion of landmasses (e.g., Greenland appears larger than Africa, even though Africa is over 14 times its size).

  • Good Hobbesian Projection

    • An equal area pseudo cylindrical projection that preserves true landmass sizes and shapes but distorts distances at map edges.
    • Note: Interrupted maps remove parts of the globe to minimize distortion, while uninterrupted maps keep everything intact, causing more distortion in some areas.

  • Robinson Projection

    • A projection that attempts to minimize distortion across the entire map but can introduce more distortion near the poles.

  • Gall Peters Projection

    • One of the more accurate depictions of landmass sizes but can significantly distort shapes and direction.

Types of Maps

  • Reference Maps

    • Informational maps showing boundaries, toponyms, and geographic features (e.g., topographic maps that use contour lines to indicate terrain elevation).
    • Closer contour lines indicate steeper terrain; wider lines indicate a gradual slope.

  • Thematic Maps

    • Display specific data topics and spatial patterns.
Common Thematic Maps

  • Choropleth Maps

    • Use varying colors or shades to indicate different data quantities.

  • Dot Density Maps

    • Show data by placing points on a map to visualize spatial distribution (can appear clustered or dispersed).

  • Graduated Symbol Maps

    • Utilize symbols to indicate quantities in specific locations (may lead to overlapping confusion).

  • Isoline Maps

    • Use lines to connect areas of equal value (e.g., temperature maps).

  • Cartograms

    • Represent data dynamically, with areas adjusted according to value (e.g., depicting populations).

  • Flowline Maps

    • Illustrate the movement of goods, people, or ideas between locations.

Geographic Data Collection

  • Remote Sensing

    • Collects data about the Earth via satellites, aiding in understanding spatial change over time.

  • Geographic Information Systems (GIS)

    • Software that collects, analyzes, and displays geographic data, enabling layered map creation for spatial pattern analysis.

  • Global Positioning System (GPS)

    • Allows for precise location tracking and navigation.

  • Field Observations

    • Involves real-world visits for firsthand data collection (can be costly, but often accurate).

  • Personal Interviews

    • Collects personal insights and experiences regarding specific locations.

  • Media Reports

    • Offers insights through newspapers and articles regarding locations' conditions.

  • Government Documents

    • Provides cultural and legislative insights influencing a location.

  • Travel Narratives

    • Personal experiences recounting observations and insights into places.

  • Landscape and Photo Analysis

    • Studies images to observe environmental changes and human impacts.

Data Types

  • Qualitative Data

    • Information in word form, subjective, based on interpretation (e.g., perceptions of school lunch).

  • Quantitative Data

    • Numerical, objective data (e.g., census statistics, population pyramids), not open to interpretation.

  • Practice Techniques

    • For more information on qualitative and quantitative data, resources are available for study in the review packet.