JCOMM Technical Report No. 23
SIGRID-3 :a vector archive format for sea ice charts
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 for notes on earlier SIGRID formats and their application in SIGRID-3). For example, SIGRID variable identifiers such as “CT” for total concentration are used in SIGRID-3. While all SIGRID variable identifiers may be used in SIGRID-3, those that are commonly used are required, such as concentration, stage of development, and form. Users familiar with SIGRID encoding of ice chart information will therefore find that they are already familiar with how ice is described in SIGRID-3.
First edition: 2004