maplayr/io.attractions.maplayr.model.coordinate.projection/MapProjection

MapProjection

abstract class MapProjection

Abstract base class for map coordinate projection systems.

A map projection defines how geographic coordinates (latitude/longitude) are transformed to and from 2D map coordinates. This class provides the core transformation methods and utilities for different projection types.

Implementations must provide the forward and inverse projection transformations, as well as the derivative function for scale calculations.

Since

0.0.86

Inheritors

Constructors

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constructor()

Types

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object WebMercator : MapProjection

An implementation of MapProjection for the Web Mercator projection

Functions

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abstract fun geographicToMapPoint(geographicCoordinate: GeographicCoordinate): MapPoint

Converts a GeographicCoordinate to a MapPoint.

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abstract fun mapPointToGeographic(mapPoint: MapPoint): GeographicCoordinate

Converts a MapPoint back to a GeographicCoordinate.

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fun scaleAt(geographicCoordinate: GeographicCoordinate): Double

This function computes a map vector where each dimension is the length of a metre at the map point the given coordinates project into. The average of the magnitude in the x & y direction of the resulting vector is computed which is returned as the scale.