Visit the BTAA Geoportal Use our search portal to find scanned maps, GIS data, aerial imagery, and other geospatial resources.

BTAA Geoportal Help pages

These guides provide help on using the BTAA Geoportal.

BTAA Geoportal search strategies Start here to learn how to search for resources in the BTAA Geoportal (text + screenshots)

BTAA Geoportal video tutorials Step-by-step examples that apply BTAA Geoportal search strategies to real datasets

Allmaps Plugin This page describes the Geoportal Allmaps Plugin and gives instructions for using this tool to create a georeferenced map overlay in the browser.

Citing geospatial data This guide discusses data citation options and how to use the Cite widget in the BTAA Geoportal.

Topical Guides

Our topical reference guides provide general finding aids for topical resources and our Help pages provide guidance on using the BTAA Geoportal.

U.S. Census Data Census data is available from many different sources, formats, and geographies. This guide describes the pros and cons of several sources as well as what types are available in the BTAA Geoportal.

Fire Insurance Maps Fire insurance maps, including Sanborn Maps, are among the most commonly sought after items in the BTAA Geoportal. This guide explains how to find these resources and how to interpret their symbology.

Public Land Survey System (PLSS) Plats There are thousands of PLSS plats in the BTAA Geoportal and this guide describes how to search for them and how to find their associated field notes.

Licensed data Most of the resources in the BTAA Geoportal are free and open, but we also include an index of licensed databases commonly accessed by researchers affiliated with a BTAA university. The Licensed Data research guide explains how to interpret those records and access the data.