IRI.Maptor.Sta.SpatialReferenceSystem 2.8.8

🌐 IRI.Maptor.Sta.SpatialReferenceSystem

A .NET library for advanced spatial reference systems (SRS), geodetic transformations, and map projections

This library provides implementations of horizontal spatial reference systems as defined in geodesy, supporting three primary categories:

• Terrestrial Coordinate Systems
  • Conventional Terrestrial (CT or AT)
  • Instantaneous Terrestrial (IT)
  • Geodetic (G)
  • Local Geodetic (LG)
  • Local Astronomic
• Celestial Coordinate Systems
  • Apparent Places (AP)
  • Right Ascension (RA)
  • Horizontal Angle (HA)
• Orbital Coordinate Systems
  • Orbital (OR)

Fig. 1: Relationship between geocentric, topocentric, and 2D coordinate systems

✨ Features

1. Supported Map Projections & Horizontal Datums

This library implements standard map projections and geodetic datums, including:

• Projections:
  • Transverse Mercator (TM)
  • Universal Transverse Mercator (UTM)
  • Web Mercator (Auxiliary Sphere)
  • Cylindrical Equal-Area
  • Albers Equal-Area Conic (1- and 2-parallel variants)
  • Lambert Conformal Conic (1- and 2-parallel variants)
• Horizontal Datums:
  • 30+ predefined ellipsoids (WGS84, GRS80, Clarke 1866, etc.)
  • Custom ellipsoid support via semi-major/minor axis parameters

2. Coordinate System Transformations

Transformation between different spatial reference systems are available including:

• CT ↔ IT
• CT ↔ G
• G1 ↔ G2 (transform Geodetic system with different ellipsoids)
• CT ↔ LA
• G ↔ LG
• LA ↔ LG
• LA ↔ HA
• HA ↔ AP
• IT ↔ AP
• OR ↔ AP

🚀 Getting Started

Basic Usage

Convert WGS84 to AT:

// Arrange
var wgs84Ellipsoid = Ellipsoids.WGS84;
double latitudeInDegrees = 35.123456;
double longitudeInDegrees = 51.123456;
    
var originalGeodeticPoint = new IRI.Maptor.Sta.Common.Primitives.Point(longitudeInDegrees, latitudeInDegrees);

// Act - Test geodetic to Cartesian conversion
var cartesianFromTransform = Transformations.ToCartesian(originalGeodeticPoint, wgs84Ellipsoid);

var cartesianFromGeodeticPoint = new GeodeticPoint<Meter, Degree>(
    wgs84Ellipsoid, 
    new Meter(0),
    new Degree(longitudeInDegrees),
    new Degree(latitudeInDegrees))
    .ToCartesian<Meter>();

// Assert - Both Cartesian conversion methods should produce same result
Assert.Equal(cartesianFromGeodeticPoint.X.Value, cartesianFromTransform.X, 9);
Assert.Equal(cartesianFromGeodeticPoint.Y.Value, cartesianFromTransform.Y, 9);
Assert.Equal(cartesianFromGeodeticPoint.Z.Value, cartesianFromTransform.Z, 9);

📦 NuGet: IRI.Maptor.Sta.Spatial

🐞 Report Issues: GitHub Issues