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@mbostock

mbostock/.block

Last active January 16, 2020 12:46
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GeoTIFF Contours
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.block
license: gpl-3.0
height: 481
redirect: https://observablehq.com/@d3/geotiff-contours
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README.md
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index.html
<!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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sfctmp.tiff
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@timelyportfolio
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dang, impressive!

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