McBryde-Thomas Flat-Polar Quartic
Release 9.2 Last modified August 3, 2007	Print all topics in : "Supported map projections"

Description

This equal-area projection is primarily used for world maps.

Projection method

A pseudo cylindrical equal-area projection in which all parallels are straight lines and all meridians, except the straight central meridian, are equally spaced, fourth-order (quartic) curves.

Linear graticules

All parallels are unequally spaced straight lines that are closer together at the poles. The poles are straight lines one-third as long as the equator. The central meridian is a straight line 0.45 times as long as the equator.

Properties

Shape

Shapes are stretched north–south along the equator, relative to the east–west dimension. This stretching decreases to zero at 33°45' N and S at the central meridian. Nearer the poles, features are compressed in the north–south direction.

Area

Equal area.

Direction

Distorted except at the intersection of 33°45' N and S and the central meridian.

Distance

Scale is distorted everywhere except along 33°45' N and S.

Limitations

Useful only as a world map.

Uses and applications

Thematic maps of the world.

Parameters

Desktop

• False Easting
  
• False Northing
  
• Central Meridian
  
• Supported on spheres only
  

Workstation

• Longitude of projection's center
  
• Supported on spheres only
  

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