An example of d3-contour. See the same dataset reprojected to Natural Earth.
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January 16, 2020 12:46
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GeoTIFF Contours
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| license: gpl-3.0 | |
| height: 481 | |
| redirect: https://observablehq.com/@d3/geotiff-contours |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <svg width="960" height="481"></svg> | |
| <script src="https://unpkg.com/d3-array@1"></script> | |
| <script src="https://unpkg.com/d3-contour@1"></script> | |
| <script src="https://unpkg.com/d3-collection@1"></script> | |
| <script src="https://unpkg.com/d3-color@1"></script> | |
| <script src="https://unpkg.com/d3-dispatch@1"></script> | |
| <script src="https://unpkg.com/d3-geo@1"></script> | |
| <script src="https://unpkg.com/d3-interpolate@1"></script> | |
| <script src="https://unpkg.com/d3-request@1"></script> | |
| <script src="https://unpkg.com/d3-selection@1"></script> | |
| <script src="https://unpkg.com/d3-scale@1"></script> | |
| <script src="https://unpkg.com/geotiff@0.4/dist/geotiff.browserify.min.js"></script> | |
| <script> | |
| d3.request("sfctmp.tiff").responseType("arraybuffer").get(function(error, request) { | |
| if (error) throw error; | |
| var tiff = GeoTIFF.parse(request.response), | |
| image = tiff.getImage(), | |
| values = image.readRasters()[0], | |
| m = image.getHeight(), | |
| n = image.getWidth(); | |
| var color = d3.scaleSequential(d3.interpolateMagma) | |
| .domain(d3.extent(values)); | |
| var contours = d3.contours() | |
| .size([n, m]) | |
| .smooth(false) | |
| .thresholds(20); | |
| d3.select("svg") | |
| .attr("viewBox", [0, 0, n, m]) | |
| .selectAll("path") | |
| .data(contours(values)) | |
| .enter().append("path") | |
| .attr("d", d3.geoPath()) | |
| .attr("fill", function(d) { return color(d.value); }); | |
| }); | |
| </script> |
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dang, impressive!