contour line

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https://github.com/benfred/contour_plot

d3-contour released 4/7!
https://github.com/d3/d3-contour

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• d3.js contour plot https://bl.ocks.org/mbostock/4241134

• plotly.js https://plot.ly/javascript/contour-plots/

• d3.js contour with tooltips http://www.benfrederickson.com/numerical-optimization/

• leaflet contour https://github.com/frogcat/leaflet-gsi-contour

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Convert matplotlib contour plots to geojson
https://github.com/bartromgens/geojsoncontour

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adding label
http://geoexamples.com/d3-raster-tools-docs/plot/isolines.html
http://geoexamples.com/d3-raster-tools-docs/code_samples/isolines-page.html

[tattii]

bilinear interpolation とずれる