The web developer’s guide to cartography
summary
Maps show Romanian May 2019 European Parliament results at municipality level by converting 3,180 administrative polygons into points, cutting a 200 MB GeoJSON to a 345 KB CSV and loading it as a CSV layer. Uses ArcGIS API for JavaScript, Esri world hillshade raster tiles and vector tiles for borders, applies opacity to show percentage and circle size to show absolute votes, finds 92% Hungarian-minority support in some areas, and reports about 20 hours total work (≈10h data wrangling, minutes to style).
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chapters (11)
- 0:00Introduction to web mapping
- 3:06Choosing the story and data
- 6:56Understanding geographic data
- 8:09Working with raster data
- 11:15Vector data fundamentals
- 14:58Processing and cleaning data
- 17:16Converting data formats
- 19:08Thematic maps explained
- 21:22Color and visual variables
- 23:57Rendering the election map
- 26:08Q&A and closing
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