New Hampshire State Wide Clearinghouse.
New Hampshire County Registries of Deeds
Example: Franquelin’s map of Louisiana
Free USGS 7.5 Minute Topographic Quadrangles
National Geographic is allowing everyone to easily download any USGS 7.5 minute topo map in the continental U.S. as a multi-page PDF that can be printed on letter size paper on any printer. These are the same topographic maps that were published by the U.S. Geological Survey for decades, with nice additional features from their much-loved, but discontinued TOPO! software product, including:
NOTE: Since the USGS stopped updating their printed topos decades ago, some of these maps do not accurately reflect the current landscape. For the most detailed and up-to-date maps of popular outdoors recreation areas, we recommend their Trails Illustrated maps
Managed by the largest commercial GIS organization in the world. Over 70,000 data sets from 4,100 organizations.
The ArcGIS Living Atlas is a collection of geographic information from around the globe. It includes maps, apps, and data layers. Login required for subscriber and premium content.
OpenStreetMap is built by a community of mappers that contribute and maintain data about roads, trails, cafés, railway stations, and much more, all over the world.
You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors. If you alter or build upon our data, you may distribute the result only under the same licence. The full legal code explains your rights and responsibilities.
NASA’s Socioeconomic Data and Applications Center (SEDAC)
Retrieve global socioeconomic data from 15 different themes
The mission of the OpenTopography Facility is to:
Find geographic data and products such as the TIGER/Line Shapefiles, KMLs, TIGERweb, cartographic boundary files, geographic relationship files, and reference and thematic maps
UNEP Environmental Data Explorer
Spatial and Non-Spatial Data
NEO provides climate and environmental changes as they occur on our home planet. You can browse and download imagery of satellite data from NASA’s constellation of Earth Observing System satellites. Over 50 different global datasets are represented with daily, weekly, and monthly snapshots, and images are available in a variety of formats including JPEG, PNG, Google Earth, and GeoTIFF.
The European Space Agency’s Sentinel satellite is now the highest spatial resolution available to the public for free.
IPUMS Terra currently focuses on five kinds of data:
All five data types have an important temporal dimension; most of the data span multiple decades, and some sources reach back to the nineteenth century or earlier. By integrating the most comprehensive global data collections on land use and climate change with the major global collections of population data, IPUMS Terra constitutes a unique international reference collection for investigating transformative changes in the human-environment system.
GeoNetwork opensource has been developed to connect spatial information communities and their data using a modern architecture, which is at the same time powerful and low cost, based on the principles of Free and Open Source Software (FOSS) and International and Open Standards for services and protocols (a.o. from ISO/TC211 and OGC).
