# Urmaev Flat-Polar Sinusoidal¶

## Parameters¶

Note

All parameters are optional for the projection.

+n=<value>

Set the $$n$$ constant. Value between 0 and 1.

+lon_0=<value>

Longitude of projection center.

Defaults to 0.0.

Note

The default convention is to interpret this value as decimal degrees. To specify radians instead, follow the value with the “r” character.

Example: +lon_0=1.5708r

+R=<value>

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