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 End-User Documentation

Geographical Projections

This document explains why map projections are important, lists their supported types, and details how to create various projections in the map control.

Expanded Overview

There are numerous ways of depicting the Earth's surface on a map. Depending on the usage, the surface can be drawn as a circle, a rectangle, an oval, etc.

Map projections provide numerous methods of representing a spherical surface, or any other three-dimensional body, on a plane. Each map projection distorts the surface in some manner. For instance, the distortion of the Mercator projection increases away from the Equator, and is extreme in the polar regions. Thus, it is difficult to say which projection is the best. The best solution is to choose a projection that meets your specific requirements.

For more information, see Map projection.

Expanded Map Projections

Expanded Customization

There are two ways to customize a map projection used in an application: create a custom ProjectionBase class descendant, that specifying a custom map projection, or configure the width/height ratio for the one of the predefined map projections.

  • To learn more on how to create your own specific map projection, refer to the How to: Implement a Custom Map Projection example.

  • To specify the width/height ratio for a map projection, do the following:

    For instance, you can find the Width/height aspect ratio values for the cylindrical equal-area projection on the following link: Cylindrical equal-area projection.

    The table below shows specializations of the cylindrical equal-area projection.

    Projection Name (Width/Height Ratio)

    Projection Preview

    Lambert (3.14)
    Behrmann (2.36)
    Trystan Edwards (2)
    Gall-Peters (1.57)
    Balthasart (1.3)

Expanded Example

The following example demonstrates how to use predefined projections, create custom map projections and customize the width/height ratio of projections.

Expanded See Also

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