Tag Archives: geojson.io

Map Club — Cartogram Hexmaps with Tilegrams

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The latest session of Map Club took a data journalism bent: last Friday, we focused on creating cartogram hexmaps with Tilegrams, a generator by data visualization studio Pitch Interactive. The tool enables users to quickly create proportionate hex-based maps of the United States using custom or built-in data, and export generated maps to both SVG and topojson.

Tilegrams provides intricate functionality for tweaking state proportions to be statistically accurate, and is relatively versatile in its export capabilities. It did have a tendency to lose state labels and borders in its SVG output, providing a less-than-detailed file for download than the browser would reflect. Participants nonetheless created a range of interesting images, uploading Tilegrams topojson data to the geojson.io interface (a tool that Map Club explored in a session from earlier this semester), downloading and visualizing data from the U.S. Census (2010), and editing and rendering a custom CSV file in the data upload window.

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From top: population count Tilegrams topojson file imported into geojson.io by Ruoran Lin, urban populations by state (US Census 2010) by Daniel Chi Cook, population counts per state (working)

Next week, for its penultimate session, our meeting will be a guided workshop focused on a general introduction to the D3.js JavaScript library. Part II of the D3.js workshop, focused specifically on geovisualization, will take place after Thanksgiving. Hope to see you there!

Map Club has a mailing list! Sign up here if you would like to receive updates on future sessions. For this session’s resources and materials, visit the Map Club Github repository.

Map Club — Simple Maps with geojson.io

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Map Club spent last Friday’s session exploring geojson.io, a simple, open-source editor for map data. geojson.io seeks to be a quick tool for creating, viewing, and sharing maps. Compatible with a number of different data formats, the interface of the tool offers basic styling functionality, as well as enables Github users to turn any map into a shareable secret Gist for collaborative viewing and editing.

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From top: geojson.io interface, geojson.io Gist, Mapbox integration

geojson.io proved especially useful for converting data into a web-ready format for integration into an external library, such as Mapbox or Leaflet.js. Thank you to everyone who attended, and look forward to seeing you next Friday!

By the way, Map Club has a mailing list! Sign up here if you would like to receive updates on future sessions. For this session’s resources and materials, visit the Map Club Github repository.