This page will offer you resources for accessing open data and data sets. Data can be useful for a variety of environmental science purposes, but especially for GIS. The page below is organized by the source of the data. Use this page as a starting point for accessing various types of data or see the Library's Data & Statistics Research Guide.
Reminder: Visit the Intellectual Property page of this guide to learn more about open licenses and usage rights for data. Make sure your data is open before use.
A great place to start if looking for subject-specific data. Provides links to open data repositories sorted by subject area.
Large open data repositories that contain data from all subject disciplines. Both more heavily used than the subject-specific repositories and may provide results.