wkt-curves

This library supports parsing WKT (well-known text) strings representing curves based on arcs of circles, and converts to and from GeoJSON.

It supports these types:

• CIRCULARSTRING (an arc of a circle, defined by three points that lie on the arc, including the start and end).
• COMPOUNDCURVE (a series of connected arcs, the first defined by three points, and each subsequent arc defined by two).
• CURVEPOLYGON (a closed shape defined by an outer COMPOUNDCURVE and optional inner COMPOUNDCURVE rings)

See the PostGIS documentation for more complete definitions of these types.

This library does not support MULTICURVE or MULTISURFACE.

Usage

import {
    arcFromPoints,
    curveToCoords,
    regularizeMidpoints,
    curveToGeoJSON,
    wktToCurve,
    curveToWkt,
} from 'wkt-curves'

const curveWkt = 'CURVEPOLYGON(COMPOUNDCURVE(CIRCULARSTRING(0 0,2 0, 2 1, 2 3, 4 3),(4 3, 4 5, 1 4, 0 0)), CIRCULARSTRING(1.7 1, 1.4 0.4, 1.6 0.4, 1.6 0.5, 1.7 1) )'

const curveGeoJSON = curveToGeoJSON(wktToCurve(curveWkt));

• wktToCurve parses a WKT string into an intermediate representation.
• curveToGeoJSON converts a parsed curve into GeoJSON.

Credits

This library was written by Steve Bennett.