Conture-Density code
d3.contours() draws contour plots from 2D point data with height values. d3.contourDensity() estimates point density first, then plots contours.
d3.contours() draws contour plots from 2D point data with height values. d3.contourDensity() estimates point density first, then plots contours.
https://cuc.yingshinet.com/V7/CH11/d3CVolcano.htm https://cuc.yingshinet.com/V7/CH11/IrisDensity.htm
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