projection.EPSG9807

projection.EPSG9807 is a Transverse Mercator projection object whose source lives in Projection.EPSG9807.ts; its projection code is 'EPSG:9807' with the alias 'Traverse_Mercator'. It mixes in projection.Common and measurer.WGS84Sphere, creating parameterized projection instances through the create factory. It is an object mixin with no standalone constructor and is accessed at runtime as projection.EPSG9807.

import { projection } from "maptalks";

const proj = projection.EPSG9807.create({
  centralMeridian: 114,
  scaleFactor: 1,
  falseEasting: 500000
});

Properties / Static Methods

• code: string — The projection code, 'EPSG:9807'.
• aliases: string[] — Alias list, ['Traverse_Mercator'].
• centralMeridian: number — Central meridian, default 0.
• create(params): projection — Static factory that creates a Transverse Mercator projection instance from parameters:
  • falseEasting — False easting, default 500000.
  • falseNorthing — False northing, default 0.
  • scaleFactor — Scale factor, default 0.9996.
  • centralMeridian — Central meridian (degrees).
  • latitudeOfOrigin — Latitude of origin (degrees).
  • startLongtitude / startLatitude — Starting longitude / latitude.

Methods

• project(p, out?): Coordinate — Project lng/lat into Transverse Mercator coordinates (meters).
• unproject(p, out?): Coordinate — Unproject Transverse Mercator coordinates back to lng/lat.
• Additionally inherits projection / batch / sphere methods from projection.Common.