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Groninger gemeenten

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FFrieseWoudloper
Last edited May 17, 2019
Created on May 17, 2019

This map shows the municipalities of the northern Netherlands, with each municipality rendered as an SVG path using D3 v4 and TopoJSON data. The map uses a Mercator projection fitted to the viewport. Hovering over a municipality triggers a tooltip that displays the municipality’s name, creating an interactive way to explore the region. The visualization is built with D3.js and TopoJSON, with the geographic data processed in Mapshaper.

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This is a TopoJSON file of municipalities in the north of The Netherlands visualized with D3.js. The TopoJSON file was created using Mapshaper.org.

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Groninger gemeenten

This example visualizes the municipalities of the Dutch province of Groningen using D3.js. The map is generated from multiple TopoJSON files (with and without bounding boxes, and with different quantization parameters) that were created with FME Desktop 2019. Due to mixed winding orders of the polygons, the initial rendering shows a rectangle instead of the correct municipality boundaries. The visualization demonstrates the impact of winding order and TopoJSON preprocessing on geographic data rendering. By comparing the different file versions, viewers can observe how the bounding box and the right-hand rule (Orientator transformer) affect the final output. The map displays the municipalities in the northern Netherlands, with the D3 code provided in index.html. A key challenge highlighted is the need for consistent polygon winding order to ensure correct D3.js visualization.**Title:** Groninger gemeenten **Description:** This visualization demonstrates a common pitfall in geographic data processing: winding order in polygon coordinates. The map displays the municipalities in the northern Netherlands, but due to mixed winding orders in the polygon definitions, D3.js renders a solid rectangle instead of the expected municipal boundaries. The author created four TopoJSON variants using FME Desktop 2019—with and without bounding boxes, and with different quantization parameters—to isolate the winding order issue. The accompanying `index.html` file contains the D3.js code used to visualize the files and reproduce the problem. This example is particularly useful for developers working with TopoJSON and D3.js, illustrating how winding order can affect rendering and how data preprocessing choices influence the final output. Source: [gist by FrieseWoudloper](https://gist.github.com/FrieseWoudloper)

FFrieseWoudloper
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