This is a 12.9MB shapefile! If your browser supports streaming fetch, it will start being displayed even before it has finished downloading. Streaming in-browser parsing is new in shapefile 0.5.
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December 5, 2023 16:36
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Streaming Shapefile
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| license: gpl-3.0 | |
| height: 600 | |
| redirect: https://observablehq.com/@mbostock/streaming-shapefiles |
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| <!DOCTYPE html> | |
| <canvas width="960" height="600"></canvas> | |
| <script src="https://unpkg.com/d3-array@1"></script> | |
| <script src="https://unpkg.com/d3-geo@1"></script> | |
| <script src="https://unpkg.com/d3-geo-projection@2"></script> | |
| <script src="https://unpkg.com/[email protected]"></script> | |
| <script> | |
| var canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"); | |
| var path = d3.geoPath() | |
| .context(context) | |
| .projection(d3.geoAlbersUsa() | |
| .scale(1285) | |
| .translate([canvas.width / 2, canvas.height / 2])); | |
| context.lineWidth = 0.5; | |
| shapefile.open("https://cdn.rawgit.com/matplotlib/basemap/v1.1.0/lib/mpl_toolkits/basemap/data/UScounties.shp", null) | |
| .then(function(source) { | |
| return source.read().then(function next(result) { | |
| if (result.done) return; | |
| context.beginPath(); | |
| path(result.value); | |
| context.stroke(); | |
| return source.read().then(next); | |
| }); | |
| }) | |
| .catch(function(error) { | |
| console.error(error.stack); | |
| }); | |
| </script> |
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I used to think shapefiles are always zipped together with at least dbf and shx files. How do you join them to a single one?