It looks like the prevailing direction of the wind and perhaps the temperature during various times of the year. Just a guess. Louise Louise Ratliff Social Sciences and Map Catalog Librarian UCLA Library Cataloging & Metadata Center 2400 Life Sciences Building Box 957230 Los Angeles, CA 90095-7230 (310)206-5853 From: Maps-L: Map Librarians, etc. <[log in to unmask]> On Behalf Of Kathy Stroud Sent: Thursday, January 3, 2019 12:39 PM To: [log in to unmask] Subject: Trivia Question - What is this a map of??? I know I've seen this map before, but I don't recall what it represents. Obviously I have something taken out of context. https://tinyurl.com/y7qr8erk Kathy Stroud David and Nancy Petrone Map/GIS Librarian Knight Library 1299 University of Oregon Eugene, OR 97403-1299 541-346-3051 "A map is not just a picture-it's also the data behind the map, the methodology used to collect and parse that data, the people doing that work, the choices made in terms of visualization and the software used to make them."