Equidistant Conic projection

The Equidistant Conic projection is one of the simplest of all projections. Based on a cone, it is typically found in atlases of small countries and is used for portrayals of areas near to, but not overlapping, the equator. The equidistant conic projection has equally spaced straight meridians and equally spaced circular parallels, making scale is the same along all meridians. Commonly one or two parallels are chosen to have the same scale and have no distortion.

Neither equal-area, nor conformal (but an acceptable compromise for most temperate countries), this projection is defined arbitrarily instead of by a perspective process. It is the general case of both azimuthal equidistant and equidistant cylindrical projections..



More Information

 * Conic Projections
 * The Nomenclature and Classification of Map Projections Empire Survey Review No. 51, Vol VII January 1944 Pages 190-200 ; L.P. Lee, Lands Survey Department, Wellington, N.Z.
 * Matching the Map Projection to the Need
 * List of ESRI-supported map projections
 * Weisstein, Eric W. Map Projections. From MathWorld--A Wolfram Web Resource.
 * Map Projections''. Atlas of Canada.
 * Cartographical Map Projections'', Carlos A. Furuti website, www.progonos.com.
 * Elements of Map Projection. (26 MB download) U.S. Coast and Geodetic Survey, Special Publication 68 (1938).
 * Map Projections. USGS Publications. December 2000.
 * What are map projections? ArcGIS 10 Online Help
 * University of Colorado at Boulder - Map Projection Overview with Illustrations
 * Data Projections. GeoCommunity Web site.
 * Wiki.GIS.com - Types of Projections