Maptor

IRI.Maptor.Core.SpatialReferenceSystem

NuGet Target

Spatial reference systems, geodetic transformations, and map projections for the Maptor stack. Implements the horizontal coordinate systems of geodesy — terrestrial (conventional/instantaneous terrestrial, geodetic, local geodetic, local astronomic), celestial (apparent place, right ascension, horizontal angle), and orbital — together with the transformations between them and the common map projections.

Installation

dotnet add package IRI.Maptor.Core.SpatialReferenceSystem

Features

  • Map projections: Mercator, Web Mercator, Transverse Mercator, UTM, cylindrical equal-area, Lambert conformal conic (1- and 2-parallel), and Albers equal-area conic (function form in MapProjects)
  • Reference ellipsoids: predefined models (WGS84, GRS80, Clarke 1866/1880, Bessel 1841, International 1924, …) plus custom ellipsoids via semi-major/semi-minor axis parameters
  • Coordinate system transformations (Transformations): geodetic to geocentric Cartesian and back, datum change between ellipsoids (ChangeDatum), average/instantaneous terrestrial, local astronomic and local geodetic, horizontal angle, apparent place, and orbital conversions
  • Typed geodetic points (GeodeticPoint<TLinear, TAngular>) built on the unit types of IRI.Maptor.Core.Common
  • Ready-made SRS definitions (SrsBases: GeodeticWgs84, WebMercator, UTM zones, Lambert variants) and SRID helpers (SridHelper: 4326, 3857, 102100)

Usage

Convert a geodetic position to geocentric Cartesian coordinates:

using IRI.Maptor.Core.Common.Primitives;
using IRI.Maptor.Core.SpatialReferenceSystem;

var wgs84 = Ellipsoids.WGS84;

var geodetic = new Point(51.123456, 35.123456);   // longitude, latitude in degrees

var cartesian = Transformations.ToCartesian(geodetic, wgs84);

Project geodetic coordinates to Mercator:

using IRI.Maptor.Core.Common.Primitives;
using IRI.Maptor.Core.SpatialReferenceSystem;

var projected = MapProjects.GeodeticToMercator(new Point(51.4, 35.7));

Work with typed geodetic points:

using IRI.Maptor.Core.Common.Metrics;
using IRI.Maptor.Core.SpatialReferenceSystem;

var point = new GeodeticPoint<Meter, Degree>(
    Ellipsoids.WGS84,
    new Meter(0),
    new Degree(51.123456),
    new Degree(35.123456));

var cartesian = point.ToCartesian<Meter>();

See also

  • Coordinate systems — the geocentric/topocentric systems and how Transformations converts between them
  • Map projections — UTM, Web Mercator, and the other implemented projections
  • Models — reference ellipsoids and horizontal datums

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