Check two valid geojson geometries for equality.
npm install geojson-equalityCheck two valid geojson geometries for equality.
``
npm install geojson-equality
javascript
var GeojsonEquality = require('geojson-equality');
var eq = new GeojsonEquality();
var g1 = { "type": "Polygon", "coordinates": [
[[30, 10], [40, 40], [20, 40], [10, 20], [30, 10]]
]};
var g2 = { "type": "Polygon", "coordinates": [
[[30, 10], [40, 40], [20, 40], [10, 20], [30, 10]]
]};eq.compare(g1,g2); // returns true
var g3 = { "type": "Polygon", "coordinates": [
[[300, 100], [400, 400], [200, 400], [100, 200], [300, 100]]
]};
eq.compare(g1,g3); // returns false
`
For including in browser, download file geojson-equality.min.js
html
`
This create a global variable 'GeojsonEquality'
GeojsonEquality class can be initiated with many options that are used to match the geojson.
* precision number as floating points precision required. Defualt is 17
javascript
var g1 = { "type": "Point", "coordinates": [30.2, 10] };
var g2 = { "type": "Point", "coordinates": [30.22233, 10] };
var eq = new GeojsonEquality({precision: 3});
eq.compare(g1,g2); // returns false
var eq = new GeojsonEquality({precision: 1});
eq.compare(g1,g2); // returns true
`
* direction true | false, direction of LineString or Polygon (orientation) is ignored if false. Default is false.
javascript
var g1 = { "type": "LineString", "coordinates":
[ [30, 10], [10, 30], [40, 40] ] };
var g2 = { "type": "LineString", "coordinates":
[ [40, 40], [10, 30], [30, 10] ] };
var eq = new GeojsonEquality({direction: false});
eq.compare(g1,g2); // returns true
var eq = new GeojsonEquality({direction: true});
eq.compare(g1,g2); // returns false
`* objectComparator function, custom function for use in comparing Feature properties. Default is a shallow comparison.
javascript
// using lodash isEqual to deep comparison
var isEqual = require('lodash/lang/isEqual')
var eq = new GeojsonEquality({objectComparator: isEqual});
`developing
Once you runnpm install`then for running test
npm run test`to create build
npm run build``