Resources for Using and Locating GIS Data
Government agencies, higher education institutions, research organizations, NGOs (Non-Government Organizations), and private data vendors are the major GIS data providers. These data may be acquired over the Internet or with a request to the data providers, at no cost or with a fee. Several GIS datasets for Carleton College campus created by the ENTS GIS Lab are available for download from the Carleton College Campus GIS Web page (log on with a Carleton user account required).
Often you will need to modify the acquired data to fit the needs of your project. Contact Wei-Hsin Fu (x5733, email@example.com) if you need help in acquiring or editing your GIS data.
Can I use that GIS data or map? by Nicholas Duggan, 2014
In the article a simple guide to legal pitfalls in using GIS data and map: