object

crs_projections

Coordinate reference systems and common transformations for 2D and 3D WGS84 geodetic coordinates, Web Mercator, World Mercator, ECEF, local ENU tangent-plane, Lambert azimuthal equal-area, and UTM coordinates.

Availability:

logtalk_load(crs_projections(loader))

Author: Paulo Moura

Version: 1:0:0

Date: 2026-05-10

Compilation flags:

static, context_switching_calls

Implements:

public crs_projections_protocol

Uses:

geospatial

Remarks:

• Geographic coordinates: WGS84 coordinates are represented as geographic(Latitude,Longitude) in degrees.

• 3D geodetic coordinates: WGS84 3D coordinates are represented as geographic(Latitude,Longitude,EllipsoidalHeight) using degrees for angular axes and meters for height.

• Projected coordinates: Web Mercator, World Mercator, and Lambert azimuthal equal-area coordinates are represented as meter-based projected(X,Y) pairs. UTM coordinates are represented as grid(Easting,Northing) pairs.

• Geocentric coordinates: ECEF coordinates are represented as ecef(X,Y,Z) triples in meters.

• Local tangent-plane coordinates: ENU coordinates are represented as enu(East,North,Up) triples in meters relative to an origin coordinate.

• UTM coverage: UTM helpers and transformations only succeed for latitudes in the [-80.0,84.0[ range.

Inherited public predicates:

 crs_dimensions/2  crs_epsg/2  crs_kind/2  crs_name/2  crs_units/2  epsg_crs/2  lambert_azimuthal_equal_area/3  lambert_azimuthal_equal_area_inverse/3  local_tangent_plane/3  local_tangent_plane_inverse/3  transform/4  utm_crs/2  utm_zone/2  valid_coordinate/2  valid_crs/1

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)

See also

crs_projections_protocol, geospatial