# Hammer-Aitoff

## Description

The Hammer–Aitoff projection is a modification of the Lambert azimuthal equal area projection.

Learn more about the Lambert azimuthal equal area projection

## Projection method

Modified azimuthal. The central meridian is a straight line half as long as the equator. The other meridians are complex curves, concave toward the central meridian and unequally spaced along the equator. The equator is a straight line; all other parallels are complex curves, concave toward the nearest pole and unequally spaced along the central meridian.

## Point of tangency

Central meridian at the equator.

## Linear graticules

The equator and central meridian are the only straight lines.

## Properties

### Shape

Distortion increases away from the origin.

### Area

Equal area.

### Direction

Local angles are true only at the center.

### Distance

Scale decreases along the equator and central meridian as distance from the origin increases.

## Limitations

Useful only as a world map.

## Uses and applications

Thematic maps of the whole world.

## Parameters

### Desktop

- False Easting
- False Northing
- Central Meridian

Supported on spheres only.

### Workstation

- Longitude of Central Meridian

Supported on spheres only.