National Geographic's Maps page contains many wonderful interactive resources, in addition to those beautiful wall maps (and base maps for your ArcGIS applications). You will need to create a free account, but what a wonderful resource!
The Census Bureau has developed the Data Visualization Gallery, "a weekly exploration of Census data" in a more visual format (h/t to Dave T.). They also provide a page of Interactive Internet Data Tools.
You might not be all that interested in the NYC mayoral election, but the NYC Election Atlas is an intriguing example of the power of visualizing demographic data via mapping.
When you get tired of Google Maps, you can scoot over to Open Street Map, a crowd-sourced world map with beautiful cartographic detail. Includes cycle and transport layers and looks great on your phone, too!
Well neat! We don't usually feature commercial sites, but where else can you buy fishing maps? or the now-famous Atlas of True Names? Just in time for vacation, get every map you'll ever need at Omnimap.com.
The Atlas of Urban Expansion provides the geographic and quantitative dimensions of urban expansion and its key attributes in cities the world over. Map sections include urban land cover and historical samples, plus data for downloading.
Some tools get better all the time, such as the recently-updated Census Bureau website, which includes quick facts, American Fact Finder, interactive map viewers, and extensive searching of data for downloading. Even easier to find your answers!
Along with other map-related multimedia, have fun exploring the Mapping America: Every City, Every Block tool hosted by the New York Times. This maps local data from the Census Bureau's American Community Survey for the entire country in several categories.
GIS professionals and amateurs assist with disaster response and recovery efforts, as seen in the wake of Hurricane Sandy at ESRI, Google, Crisis Commons, and other NYC resources. The New York Times' coverage included Hurricane Sandy and Coastal Flooding maps.
To demonstrate how maps can inform, educate and inspire, ESRI features samples of "story maps" at Storytelling with Maps. There is also a tutorial on using ArcGISOnline for creating story maps at the ArcGIS Resources communities page (which includes another gallery of maps).
NOAA has an entire web site devoted to climate change, including an interesting series of images and videos documenting changes over time, many of which feature mapped data. A nice example of the immediacy of the visual representation of data.
The USGS is in the process of digitizing its entire collection of historical topographic maps. Wow! This is just one aspect of what's available at The National Map, which features professional-level tools at the National Atlas or with the National Map Viewer.
Our "back to school" edition features our own pages of resources related to spatial thinking and mapping exercises. Newly-revamped pages include: online map collections; map-related teaching resources; sample student mapping projects; and spatial thinking and analysis.
The hot summer brings Climate Data Online, a nifty interactive map tool from NOAA to help you understand the current drought and other climate issues. You can search by geographic regions, climate themes and various observational data.
An amazing collection of over 700 maps, the Language and Location - Map Accessibility Project "is a digital mapping project that integrates language data and information from the physical and social sciences." In addition, you can create maps from your own data.
Just in time for the primaries, we have Redistricting and You, developed by the CUNY Center for Urban Research (the same outfit who brought you OASIS). These maps allow you to compare the major proposals with existing districts and with each other. Check out the slider bar for comparing current and proposed districts!
For Earth Day you can examine the EPA's new Greenhouse Gas Emissions map, which can be searched by location or facility and filtered by gas or emission range. The Earth Day 2012 Event Finder will help you find something to do for Earth Day (or create your own event).
Just released by JISC, we have Old Maps Online, which will "act as a central repository to a vast collection of maps held by institutions across the globe." And when you access the site, it initializes to your location. Cool!
Many institutions are producing web sites featuring a geo-referenced map serving as an interface through which one can explore a database of information. One fascinating example is the Nolli Map Engine from the University of Oregon, featuring a 1748 map of Rome.
Do you like "going up north"? The Adirondack Park Agency is one of many New York State agencies that produce maps and data layers free to the public. Don't forget to look for "maps," "GIS" or "data layers" whenever you browse a state agency website.
The CUNY Center for Urban Research recently released Demographic Change in Metropolitan America, which uses census data to map neighborhood changes between 2000 and 2010 for Manhattan and 15 other metropolitan areas. These maps feature slider bars to help visualize change between one time period and the next. Beautiful work!
If it's November, it must be GIS Day! Sponsored by the National Geographic Society and many other organizations, GIS Day provides an international forum for users of geographic information systems (GIS) technology to demonstrate real-world applications that are making a difference in our society.
The blog Strange Maps might appear to be just an amusing demonstration of how to represent different themes on a map; but the examples will get you thinking about how information can be displayed spatially. For a similar mental exercise, check out the visual information sites at the bottom of our Spatial Thinking page.
OASISNYC is a wonderful example of community mapping -- in this case, for New York City. OASIS strives to help the public develop a better understanding of their environment with interactive maps of open spaces, property information, transportation networks, and more (check out the timeline series of lower Manhattan development).
Time to start thinking about how to incorporate spatial thinking and mapping exercises into your fall courses! Get those innovative juices flowing at our GIS in the Liberal Arts page, a widely-varied collection of classroom examples put together by Sean Connin (formerly of NITLE).
Penn State has produced the Geospatial Revolution Project, which is an integrated public service media and outreach initiative about the world of digital mapping and how it is changing the way we think, behave, and interact.
The NYS DEC Mapping Gateway is a nice example of state government online mapping resources. Take a look at the page of interactive mapping tools -- neat!
Google Earth -- not because you can zoom to your house, but for everything else: the Showcase; the Gallery; the Community; the Tutorials; the extensive Help; the blogs (and more blogs). And a special community just for Educators! And did I mention all the layers of data?
ESRI's ArcGIS Online offers both the easy-to-use My Map Viewer and the more fully-featured ArcExplorer Online, both connected to ESRI's extensive resources of free map layers. ArcExplorer includes a wonderful gallery of maps made and shared by others, so get inspired!
The New York Public Library's Maps Division developed the Map Warper, an online tool that allows the easy alignment of historical (mostly fire insurance) and digital maps. Sign up and rectify a map yourself!
Stanford University hosts a multi-faceted Spatial History Project, which is "a place for a collaborative community of scholars to engage in creative visual analysis to further research in the field of history."
The new American FactFinder, hosted by the Census Bureau, is "your source for population, housing, economic, and geographic data." Beautifully redone and very easy to use!