James Syvitski a geology professor at the University of Colorado created this 200-year compilation of dams built in the USA.
He used it to illustrated his talk on the age of the human-shaped Earth at the Geological Society of London meeting on the Anthropocene, May 11, 2011.
Nile River Delta at Night from NASA’s EOS image of the day. They write:
The Nile River and its delta look like a brilliant, long-stemmed flower in this astronaut photograph of the southeastern Mediterranean Sea, as seen from the International Space Station. The Cairo metropolitan area forms a particularly bright base of the flower. The smaller cities and towns within the Nile Delta tend to be hard to see amidst the dense agricultural vegetation during the day. However, these settled areas and the connecting roads between them become clearly visible at night. Likewise, urbanized regions and infrastructure along the Nile River becomes apparent.
Bernhard Lehner my geography colleague from Burnside Hall at McGill has recently released HydroSHEDS a new global map of the worlds rivers. Maps based upon this data were featured in the March issue of National Geographic.
HydroSHEDS is:
a new hydrographic mapping product that provides river and watershed information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced data sets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on high-resolution elevation data obtained during a Space Shuttle flight for NASA’s Shuttle Radar Topography Mission (SRTM).
It can be downloaded from USGS at HydroSHEDS Data.
