[Proj] Confused about geos projection documentation

Frank Willett fyw at wwwtools.com
Wed Apr 25 10:56:55 EST 2012

Hi All,

In the new documentation for the geos projection at:

I'm confused because it contains the following two statements:

sweep: the sweep angle axis of the viewing instrument. Can be x or y
(x is the default). (new in 4.8.0)


The sweep argument is used to tell proj.4 which on which axis the
outer-gimbal is rotating. The possible values are x or y, y being the

Which of these statements is correct?

Thanks for your input :-)

Frank Willett

More information about the Proj mailing list