May 2019
Beginner to intermediate
650 pages
14h 50m
English
Content preview from Learn D3.js
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Measuring distances
The length of objects can be measured with three functions/methods:
- geoPath.measure(object), returns a measure in pixels
- d3.geoLength(object) returns a measure in radians (which can be used to calculate the actual distance in kilometers or miles)
- d3.geoDistaince(a,b) is equivalent to d3.geoLength() but takes two position arrays instead of a GeoJSON object
If the object is a LineString, these functions return its length, as expected. If the object is a MultiLineString, the value returned is the sum of the lengths of all the segments. If it's a Polygon or MultiPolygon, the sum of the perimeters of all linear rings will be returned (including the perimeter of the holes, if any). The object can also be a GeoJSON Feature ...
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