Class: Cartesian_ReferenceFrame

latlon-ellipsoidal-referenceframe~Cartesian_ReferenceFrame(x, y, z, referenceFrameopt, epochopt)

Augments Cartesian with reference frame and observation epoch the cooordinate is based on, and methods to convert between reference frames (using Helmert 14-parameter transforms) and to convert cartesian to geodetic latitude/longitude point.

Constructor

new Cartesian_ReferenceFrame(x, y, z, referenceFrameopt, epochopt)

Creates cartesian coordinate representing ECEF (earth-centric earth-fixed) point, on a given reference frame. The reference frame will identify the primary meridian (for the x-coordinate), and is also useful in transforming to/from geodetic (lat/lon) coordinates.
Parameters:
Name Type Attributes Default Description
x number X coordinate in metres (=> 0°N,0°E).
y number Y coordinate in metres (=> 0°N,90°E).
z number Z coordinate in metres (=> 90°N).
referenceFrame LatLon.referenceFrames <optional>
 Reference frame this coordinate is defined within.
epoch number <optional>
 referenceFrame.epoch date of observation of coordinate (decimal year).
Source:
Throws:
Unrecognised reference frame, Invalid epoch.
Type
TypeError
Example
import { Cartesian } from '/js/geodesy/latlon-ellipsoidal-referenceframe.js';
  const coord = new Cartesian(3980581.210, -111.159, 4966824.522);

Extends

  • Cartesian

Members

epoch

Point’s observed epoch.
Source:

referenceFrame

Reference frame this point is defined within.
Source:

Methods

convertReferenceFrame(toReferenceFrame) → {Cartesian}

Converts ‘this’ cartesian coordinate to new reference frame using Helmert 14-parameter transformation. The observation epoch is unchanged. Note that different conversions have different tolerences; refer to the literature if tolerances are significant.
Parameters:
Name Type Description
toReferenceFrame LatLon.referenceFrames Reference frame this coordinate is to be converted to.
Source:
Throws:
Undefined reference frame.
Type
Error
Returns:
This point converted to new reference frame.
Type
Cartesian
Example
const c = new Cartesian(3980574.247, -102.127, 4966830.065, LatLon.referenceFrames.ITRF2000);
  c.convertReferenceFrame(LatLon.referenceFrames.ETRF2000); // [3980574.395,-102.214,4966829.941](ETRF2000@1997.0)

toLatLon() → {LatLon}

Converts ‘this’ (geocentric) cartesian (x/y/z) coordinate to (geodetic) latitude/longitude point (based on the same reference frame). Shadow of Cartesian.toLatLon(), returning LatLon augmented with LatLonEllipsoidal_ReferenceFrame methods convertReferenceFrame, toCartesian, etc.
Source:
Throws:
No reference frame defined.
Type
Error
Returns:
Latitude/longitude point defined by cartesian coordinates, in given reference frame.
Type
LatLon
Example
const c = new Cartesian(4027893.924, 307041.993, 4919474.294, LatLon.referenceFrames.ITRF2000);
  const p = c.toLatLon(); // 50.7978°N, 004.3592°E

toString(dpopt) → {string}

Returns a string representation of ‘this’ cartesian point. TRF is shown if set, and observation epoch if different from reference epoch.
Parameters:
Name Type Attributes Default Description
dp number <optional>
 0 Number of decimal places to use.
Source:
Returns:
Comma-separated latitude/longitude.
Type
string