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@bettercorp/svg-to-geojson

v1.0.1

Published

Convert SVG to GeoJson

Downloads

140

Readme

INFO

This package stems from https://github.com/davecranwell/svg-to-geojson We've just moved over to using path-data-polyfill over an install script.

SVG to GeoJson

Converts shapes from an SVG file present in the DOM, into a javascript GeoJSON Object.

Reference

svgtogeojson.svgToGeoJson(ArrayOfBounds, SVGNode, CurveComplexity)

ArrayOfBounds: An Array containing two items, each as Arrays of Lat/Lng points corresponding to North East and South West Lat/Lng points over which you want your SVG to be placed on a map. For example, [[51.60351870425863, 0.207366943359375], [51.342623007528246, -0.46829223632812494]] would be the (rough) bounds for projecting an SVG over Greater London. See on map

SVGNode: A DOM object for an SVG. This could be found somewhere on the page, or loaded via an async request, or raw SVG code e.g jQuery('<svg></svg>')[0]

CurveComplexity: An Integer corresponding to the number of straight-light segments a curve will be broken into. GeoJSON has no support for true circles, so svgToGeoJson converts curves into polygons with N straight sides. How many sides is controlled by CurveComplexity. Providing the value 3 would mean a curve is broken into 3 sections. Note that SVG Circles are defined as 4 joined curves, so a CurveComplexity of 3 would result in a circle that was in fact comprised of 12 facets.

Note that providing ArrayOfBounds with values that would change the native height/width of the SVG will result in the resulting GeoJSON points being stretched.

Usage

  1. Link svg-to-geojson.min.js as a <script> tag in your HTML
  2. Find the NE/SW points of your insertion area using a tool such as geojson.io
  3. Add an SVG from the DOM, or generate/insert one
  4. Run the following
var geoJson = svgtogeojson.svgToGeoJson(
  [[51.60351870425863, 0.207366943359375], [51.342623007528246, -0.46829223632812494]]
  document.getElementById('mysvg'),
  3
);