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GIS Data Links

U.S. GIS Data Clearinghouses

GOS - Geospatial One Stop
Your One Stop for Finding and Using Geographic Data geodata.gov will help you: * Find Data or Map Services * Make a Map * Browse Community Information * Cooperate on Data Acquisitions
USGS - Seamless Data Distribution
The Seamless Data Distribution System (SDDS) is the ultimate location to explore and retrieve data. U.S. Geological Survey (USGS) and the EROS Data Center (EDC) are committed to providing access to geospatial data through The National Map. An approach is to provide free downloads of national base layers, as well as other geospatial data layers. These layers are divided into framework categories. * Places * Structures * Transportation * Boundaries * Hydrography * Orthoimagery * Land Cover * Elevation Along with providing access to the data, the site contains: * Tutorial to help with downloads * Information about the downloadable products * Frequently Asked Questions * Links to product homepages and information pages
USGS Geography: The National Map
The National Map is a consistent framework for geographic knowledge needed by the Nation. It provides public access to high-quality, geospatial data and information from multiple partners to help support decisionmaking by resource managers and the public. The National Map is the product of a consortium of Federal, State, and local partners who provide geospatial data to enhance America's ability to access, integrate, and apply geospatial data at global, national, and local scales. The U.S. Geological Survey (USGS) is committed to meeting the Nation's needs for current base geographic data and maps. Our vision is that, by working with partners, we will ensure that the Nation has access to current, accurate, and nationally consistent digital data and topographic maps derived from those data.
National Atlas - Mapping Professionals
You've already invested in your own desktop mapping or GIS software. You're a skilled user of software that lets you analyze geospatial information and make your own maps. You need documented, accurate, reliable, and integrated data. Take a look at the GIS files offered in the National Atlas. They cover the Nation, you can download them today, and they're free! GIS users and Web programmers may also want to check out our online map services.
Free GIS Data - GIS Data Depot

The name says it all. Free GIS Data.

Guide to Mostly On-line and Mostly Free U.S. Geospatial and Attribute Data. Data sources have been organized into two broad classifications: State and Local Aggregations and National Aggregations. If you don't find what you're looking for under one classification don't give up! Try looking under the other. Both contain local level data.
BTS | North American Transportation Atlas Data North American Transportation Atlas Data
Bureau of Transportation Statistics - North American Transportation Atlas Data
Earth Science data and services directory: Global Change Master Directory Web Site
Our goal is to enable users to locate and obtain access to Earth science data sets and services relevant to the global change and Earth science research. The GCMD database holds more than 16,000 descriptions of Earth science data sets and services covering all aspects of Earth and environmental sciences. One can use the search box or select from the available keywords to search for data and services. We encourage your participation in writing and maintaining the information in our databases and you will find authoring tools to assist you. Subscription services are available to notify you of new entries. The Interoperability Forum is available to discuss content and database issues.

Query and order satellite images, aerial photographs, and cartographic products through the U.S. Geological Survey.
Economic Research Service ERS/USDA Data
Masthead for USDA Economic Research Service - The economics of food, farming, ...
Geography Network
The Geography Network is a global network of geographic information users and providers. It provides the infrastructure needed to support the sharing of geographic information among data providers, service providers, and users around the world. Through the Geography Network, you can access many types of geographic content including dynamic maps, downloadable data, and more advanced Web services.
The FreeGIS Project provides * software overview on Free Geographic Information Systems (our web site) * communication on developments, plans, infos on Free GIS Software and Free Geo-Data (our mailing list)
Federal Geographic Data Committee
The Federal Geographic Data Committee (FGDC) is an interagency committee that promotes the coordinated development, use, sharing, and dissemination of geospatial data on a national basis. This nationwide data publishing effort is known as the National Spatial Data Infrastructure (NSDI). The NSDI is a physical, organizational, and virtual network designed to enable the development and sharing of this nation's digital geographic information resources. FGDC activities are administered through the FGDC Secretariat, hosted by the National Geospatial Programs Office (NGPO) of the U.S. Geological Survey. The NGPO oversees other geospatial programs of national importance including The National Map and the Geospatial One-Stop activity.
FedStats Home Page
The gateway to statistics from over 100 U.S. Federal agencies
National Atlas home page
Any national atlas should provide a larger context within which to describe a nation's people, places, and resources. To date, the National Atlas of the United States has focused on providing you with information about America. But in recent years we have partnered with atlas programs in Mexico and Canada to compile authoritative and reliable geographic information that covers North America. We have begun by collaboratively building "frameworks," the essential map layers that provide a foundation for all other maps. These basic layers, including small-scale harmonized information on North American roads, water, boundaries and the like, are being offered here for the first time. Like all other raw data and documentation offered here on nationalatlas.gov, these frameworks can be downloaded at no cost and used freely without copyright concerns or license restrictions. Revised elevation data and a new watersheds map layer will be our next North American frameworks releases.
National Geospatial-Intelligence Agency
We provide Geospatial Intelligence in all its forms, and from whatever source--imagery, imagery intelligence, and geospatial data and information--to ensure the knowledge foundation for planning, decision, and action.
Geospatial Metadata Validation Service
This service checks your FGDC-compatible geospatial metadata record using mp (metadata parser). Provide a metadata record that is formatted as indented text, XML, or SGML. Results will show discrepancies between the structure of your metadata record and the expectation of the FGDC metadata standard (FGDC-STD-001-1998) and will show several potentially useful re-expressions of the metadata record itself.
USDA Economics and Statistics System
The USDA Economics, Statistics and Market Information System (ESMIS) is a collaborative project between Albert R. Mann Library at Cornell University and several agencies of the U.S. Department of Agriculture. The system contains nearly 2500 reports and datasets. These materials cover U.S. and international agriculture and related topics. Available titles include both current and historical data. Many of the current titles are available via email subscription.
USDA NRCSGeospatial Data Gateway
The Geospatial Data Gateway or Geo-Data Gateway provides easy and consistent access to natural resource data. You can search for available data by geographic area such as county or state, use our point and click map tool to find your area of interest; using a gazetteer, or by entering latitude and longitude coordinates. You can also search for data by theme, such as digital ortho imagery, digital elevation models (DEMs), or soils. You can then view a thumbnail, or sample of the data you've chosen to know if you want a copy of the data. If you do, you can either download the data directly onto your machine, pick it up via our ftp site, or order it on media such as CD.

U.S. States & Regions

EPA: Where You Live: State Environmental Agencies

EPA Website are one of the single best initial sources of high quality GIS data.
State GIS Data Sites
Click on a state to see the links for that state or scroll down below the map to view the entire list of state GIS data clearinghouse sites.
GISuser.com State GIS Data
In order to provide the GISuser with one-click access to various State GIS and geospatial data repositories and clearinghouses, please consult this current listing of official State GIS Data Clearinghouses and data repositories. All links have been verified and/or updated accordingly in an effort to provide the most up-to-date catalog of data repositories & clearinghouses.


Appraisal Vision Assessor's Database

The Assessor's database for New Haven, CT requires that you register as a user. Registration is free and will only take a few moments. Your information is used strictly for internal statistical analysis and will not be shared with any third party organizations.


CT - Environmental and Geographic Information Center - Geographic Information Systems Home Page
Geographic Information Systems at DEP plays an important role in the DEP's mission of protecting and preserving the environment for present and future generations. DEP develops and maintains a statewide automated geographic storage and retrieval system that can rapidly integrate and analyze large amounts of spatial map and file data over any selected geographic area.
DataHaven is an interactive data resource providing easy access to data and context information for over 400 indicators of community well-being in Greater New Haven and Lower Naugatuck Valley area (click on the map to see a list of the towns).
Map And Geographic Information Center, UConn's Map Library
The Map and Geographic Information Center (MAGIC), the University of Connecticut's Map Library, collects maps, atlases, gazetteers, aerial photographs, and digital geospatial data, as well as resources on the history and current state of cartography.
New Haven and the problem of change in the American city.
This interactive teaching tool contains a growing collection of images, interactive maps and data sets related to the City of New Haven.
City of New Haven City Plan Department

The City of New Haven's portal for spatial information. Not really a source of GIS data, but a good indication of what exists, if you are willing to wrangle it out of the city's GIS department.


The mission of the Center for Land Use Education and Research (CLEAR) is to provide information, education and assistance to land use decision makers, in support of balancing growth and natural resource protection. To achieve this goal, CLEAR conducts remote sensing research, develops landscape analysis tools and training, and conducts outreach education programs. CLEAR is a partnership between the Department of Natural Resources Management and Engineering (NRME) and the Cooperative Extension System (CES), two units of the College of Agriculture and Natural Resources (CANR). For more than 10 years, educators and researchers from these two CANR departments have collaborated on a number of award-winning projects focused on the relationship of natural resource protection to land use planning and management. The common foundation of these efforts is the use of remote sensing and geographic information systems (GIS) technologies to create cutting-edge information on our changing landscape, and the use of this information to develop innovative and effective outreach programs for land use decision makers. CLEAR builds upon this successful track record, underscoring CANR�s capabilities in the area of land use research and education, and providing a more cohesive institutional framework from which projects and staff can interact with existing and potential clients, colleagues, and partners. CLEAR was also created to facilitate collaboration among the Land Grant, Sea Grant, and Space Grant College Programs.
New Haven and the problem of change in the American city.
This interactive teaching tool contains a growing collection of images, interactive maps and data sets related to the City of New Haven.
Historic USGS Maps of New England & New York
The University of New Hampshire's Library's Government Documents Department holds a working collection of over 55,000 paper USGS maps. This online collection of over 1500 USGS topographic maps includes complete geographical coverage of New England and New York from the 1890s to 1950s.

New York

NYS GIS Clearinghouse
The Clearinghouse, operated by the New York State Office of Cyber Security & Critical Infrastructure Coordination, was established to disseminate information about New York's Statewide GIS Coordination Program and to provide access to the New York State GIS Data and Metadata Repository.
NYS Interactive Mapping Gateway
The Interactive Mapping Gateway is New York State's doorway to convenient access to digital orthoimagery of New York State. Through this application visitors can view and download imagery. In addition, there are links to metadata, direct download options and more.
ComCarto Data
A commercial clearinghouse for NYC GIS data
Landmark Maps: GIS Data
Geographic Information Systems (GIS) Data The GIS data is available for download as ESRITM shape (.shp) files. The data has been drawn to the City's basemap (NYCMap) and the following data sets are available: * Boundaries of the Historic Districts (Polygons) * Locations of Individual Landmarks (Points) * Locations of Interior Landmarks (Points) * Boundaries of Scenic Landmarks (Polygons)
NYC Dept of Information Technology & Telecommunication - GIS - Downloads

As a service to the public, Citywide GIS has made some data available for download. This data can be imported into a variety of commercially available products including the free GIS data viewers from both ESRI (Arc Explorer) and MapInfo (Pro Viewer).

CUGIR - Cornell University Geospatial Information Repository

CUGIR is an active online repository in the National Spatial Data Clearinghouse program. CUGIR provides geospatial data and metadata for New York State, with special emphasis on those natural features relevant to agriculture, ecology, natural resources, and human-environment interactions. In order to provide the best possible access to geospatial data for New York State, CUGIR coordinates its activities with those of the New York State GIS Clearinghouse.
BYTES of the BIG APPLE - New York City Department of City Planning

BYTES of the BIG APPLE is a family of software, data and geographic base map files for the City of New York. The Department of City Planning offers these products for free download or by a license agreement.


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