This document describes the SIGRID-3 format so that it may be understood by a variety of users and implemented by chart-producing ice centers or services. SIGRID-3 evolved from earlier SIGRID formats and incorporates much of their content (see Appendix 1
Intergovernmental Oceanographic Commission,World Meteorological Organization,International Ice Charting Working Group's Ad Hoc Format Team for the WMO Global Digital Sea Ice Data Bank Project. SIGRID-3 :a vector archive format for sea ice charts. 2010-01-01.