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Incorporating Charts into Map Apps

Learn how to enhance your map applications by incorporating charts for better data visualization. Explore various charting libraries and use cases to summarize and compare data effectively.

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Incorporating Charts into Map Apps

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  1. Incorporating Charts into Map Apps Brandon Flessner GIS Developer OKI Regional Council of Governments Ohio GIS Conference September 24 – 26, 2018 Hyatt Regency Columbus Columbus, Ohio

  2. Why Charts?

  3. Why Charts? July 2018 Unemployment Rate Source: Bureau of Labor Statistics

  4. Why Charts? Source: Bureau of Labor Statistics

  5. Why Charts? • Summarize data in ways maps cannot • Provide additional context • Add interactivity • Tell a better story

  6. Use Cases • Summarize map data • Category comparisons (bar chart) • Change over time (area/line chart) • Frequency (histogram) • Correlations (scatter plot) • Popups – give more info on a specific feature • Filtering/Highlighting

  7. Getting Started • COTS vs. Custom • Charting Libraries • Querying and Performance

  8. COTS vs. Custom COTS • Cheaper • Very quick deployment • Support • May not be customizable • Unneeded additional features • Custom • Full control over application • Larger time and financial investment • Need for in house support/staff

  9. Charting Libraries • D3.js • Google Charts • ChartJS • Many more https://github.com/d3/d3/wiki/Gallery

  10. ESRI Cedar • https://esri.github.io/cedar/ • Plugs into your ArcGIS Map/Feature Service • Handles querying the service and structuring the data for chart consumption

  11. Querying and Performance • How best to get data from server to client? • Load all data up front? • As needed? • Hybrid approach • How is you map already loading data? • Feature layer vs. map image layer • How best to structure the query? • outStatistics • groupByFieldsForStatistics • orderByFields

  12. Do Don’t Keep it simple Use map colors (chart as legend?) Order bar charts (by frequency descending or time) 3d charts Pie chart with 10+ categories (all others category?)

  13. Questions?See more at oki.org/mapsapps Brandon Flessner bflessner@oki.org

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