Before using the database, please familiarize yourself with the Data Policy and Use document.

Data Documentation – Summary information about the contents of the database.

Data Policy and Use – What you need to know about fair use and data management before accessing the database.

Variables and Calculations​ – Variables, calculations, and quality assessment information.

Quick Start Guide – A ‘how-to’ guide for understanding and interacting with the database. Read this first!

Intermediate Data Use Guide – A combination of details and examples. Read this second.

Advanced Data User Guide – A working document not recommended for the faint of heart. Read this if brave.