[Editor's note: Two great maps from this month's edition of National Geographic Magazine by Martin Gamache.]
Republished from National Geographic.
Click on each to view larger.
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[Editor's note: A free, sans-API key solution from the web mapping giant for showing elevation (point or along custom path) for Google Maps Mashups either in the v3 API directly or separately as a stand-alone web service. And it returns JSON Thanks @lagerratrobe!]
Republished from Google.
The Google Elevation web service provides you a simple interface to query locations on the earth for elevation data. Additionally, you may request sampled elevation data along paths, allowing you to calculate elevation changes along routes.
The Elevation service provides elevation data for all locations on the surface of the earth, including depth locations on the ocean floor (which return negative values). In those cases where Google does not possess exact elevation measurements at the precise location you request, the service will interpolate and return an averaged value using the four nearest locations.
With the Elevation service, you can develop hiking and biking applications, mobile positioning applications, or low resolution surveying applications.
[Editor's note: Shows relative elevations, average depths, maximum depths, and volumes of the North American Great Lakes. Applies business intelligence charting to natural world summarizing a large table.]
Republished from Wikipedia.
(Reprinted from Google’s Lat Long Blog, link)
Last summer, I (Editor, the original author’s name is Iliya Kalai) used the contour lines on a topographic map to find my way around the Adirondacks. When I joined Google Seattle as an intern in the fall, I was hoping to do something that would impact everyday users. I was given the same responsibility and freedom that a full-timer enjoys, and armed with this, I set out to add contour lines to Terrain Maps — not just in the Adirondacks, but across the globe! Now when you view Terrain Maps, you’ll see contour lines, making it easier to determine the slope of the land.
Contour lines depict elevation change by connecting points of equal elevation. Where contour lines are close together, you can expect a steep slope; where they are spread out, you can expect flatter terrain. They help highlight the elevation of areas like cities or plains where shading alone doesn’t capture gradual changes in elevation.
Now, at a glance you can see the height of the world’s peaks, or plan your next camping trip. Contour lines can even help you find a flatter bike route for your daily commute, which is key if you live in a city like Seattle. And with this release just in time for my next internship this summer, I’m looking forward to hiking Mt. Rainier.
This map is a visualization derived from more than 22,000 abstracts submitted to the Annual Meetings of the Association of American Geographers during a ten-year period from 1993 to 2002. The methodology is centered around the representation of each document as an n-dimensional vector of terms. These vectors are used to construct a neural network model of the geographic knowledge domain using a Self-Organizing Map (SOM). The neural network model is then transformed into two types of information: (1) a landscape in which elevation indicates the degree to which a single, focused topic is addressed; and (2) multilevel text labels associated with regions in the visualization. The final rendering was executed in standard geographic information systems (GIS) software.