tu-darmstadt-ros-pkg/hector_localization — pull request #3 by cottsay (2014-03-21 06:17:47+00:00)
Title: Use "Public Domain" license for world_magnetic_model

Please do not use an empty license tag.

See: https://github.com/ros-infrastructure/bloom/pull/250

WMM is public domain:
http://www.ngdc.noaa.gov/geomag/WMM/license.shtml

Thanks