# Hammer & Eckert-Greifendorff¶

proj-string: +proj=hammer

## Parameters¶

Note

All parameters are optional for the projection.

+W=<value>

Set to 0.5 for the Hammer projection and 0.25 for the Eckert-Greifendorff projection. +W has to be larger than zero.

Defaults to 0.5.

+M=<value>

+M has to be larger than zero.

Defaults to 1.0.

+lon_0=<value>

Longitude of projection center.

Defaults to 0.0.

+R=<value>

Radius of the sphere given in meters. If used in conjunction with +ellps +R takes precedence.

+x_0=<value>

False easting.

Defaults to 0.0.

+y_0=<value>

False northing.

Defaults to 0.0.