Dots on a Map

Deploying an interactive point map:

a technical presentation.

Branden DuPont

Data Analyst

Medical College of Wisconsin

Institute for Health and Equity

PA Class of 2015

Who I am. What I Do.

  • Data Analyst
  • Law Clerk
  • Expertise: analytics in criminal/civil justice with a spatial emphasis
  • Relevant expertise for presentation: Data Viz
    • "Data visualization is broadly defined as a method of encoding quantitative, relational, or spatial information into images." - Jack Dougherty

Overview of FirstĀ  Presentation

  • Map your Data (in Tableau)
    • Basic spatial data types (point, polygon, line)
    • Advance examples
  • Zip Codes are Polygons
    • What are zip codes
    • Census data
  • Here be dragons
    • MOE
    • MAUP
    • Choosing a tool
    • Spreadsheet Considerations

Create a Point Map

  • Tidy data basics
  • Geocoding basics
  • Geocode Prep
  • Using a batch geocoder: Geocodio
  • Dots on a Map
  • Basemap from Mapbox
  • Design and Cartography Notes
  • Publish Map

Resources/Citations

  • https://www.datavizforall.org/introduction/what.html
  • https://www.gislounge.com/geodatabases-explored-vector-and-raster-data/
  • https://www.gislounge.com/gis-dictionary/
  • Bullet Three

Spatial Data Types

(vector)

  • Polygon - used to represent areas that have a boundary e.g. zip code, city boundary, park
  • Point - discrete point. Can be represented by latitude and longitude pair e.g. restaurant, residential home, incident of crime
  • Line - linear feature e.g. river, street,
  • Combination of the above
  • Vector vs raster

Polygon Map Example

Point Map Example

Line Map Example (MCTS)

Advance Examples

Searchable Lead Service Line Map

MHCP Safety Net Clinic Directory

Basic Example - Resident Contacts

Zip Codes are Polygons

  • Bullet One
  • Bullet Two
  • Bullet Three

Geographers Hate The Overuse Of Zip Codes As A Unit of Analysis

Margin of Error (MOE)

Seth Spielman - Assistant Professor of Geography, University of Colorado

Modifiable Areal Unit Problem (MAUP)- add gerrymader chart

MAUP Example

Choose a Tool

  • Bullet One
  • Bullet Two
  • Bullet Three

Spreadsheet Considerations

  • Bullet One
  • Bullet Two
  • Bullet Three

Additional Considerations

Create a Point Map

  • Bullet One
  • Bullet Two
  • Bullet Three
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