geosquare / geojson-equality Goto Github PK
View Code? Open in Web Editor NEWCheck two valid geojson geometries for equality.
License: MIT License
Check two valid geojson geometries for equality.
License: MIT License
The way GeojsonEquality
check handles precision can result in incorrect results. The following example illustrates the problem:
const point1 = {"type": "Point", "coordinates": [100.55719328, 23.0365925]}
const point2 = {"type": "Point", "coordinates": [100.55719327926636, 23.03659249995325]}
const eq1 = new GeojsonEquality({ precision: 7});
const eq2 = new GeojsonEquality({ precision: 6});
eq1.compare(point1, point2) // returns true
eq2.compare(point1, point2) // returns false !
This is incorrect. If two points are equal to a precision of 7, then by definition they must be equal to a precision of 6 as well. The problem here arises from the use of toFixed to round the coordinates. The problem is that this introduces rounding errors that then cause the equality check to fail.
I think a better way to check that values are within the required precision is something like:
Math.abs(a - b) < (10**-6) // returns true, as expected
Math.abs(a - b) < (10**-7) // returns true, as expected
Very happy to make a PR if you agree that this is a preferable approach.
Any chance to support esm and not commonjs?
Add support for bbox comparison in geojson for type "Feature".
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