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Map Projection Types

In the following sections, the available IDL projections are discussed in detail. The projections are grouped within three categories:

Each section includes characteristics of the projection type, and information on uses suited to the projection type.

The General Cartographic Transformation Package (GCTP) map projections are not described here. Documentation for the GCTP package is available from the US Geologic Survey at

In this text, the plane of the projection is referred to as the UV plane with horizontal axis u and vertical axis v.

  IDL Online Help (June 16, 2005)