A new unified geologic map of the Moon, based on digital renovations that updated 1970s-era geologic maps to match more recent topographic and image data gathered by lunar orbiters, was released by the USGS last month. The map is “a seamless, globally consistent, 1:5,000,000-scale geologic map”; the paper version (25 MB JPEG) provides azimuthal projections beyond the 55th parallels and an equirectangular projection between the 57th parallels. [Geography Realm]
This is a map of the United States without insets. Published in 1975 by the U.S. Geological Survey, it shows Alaska, Hawaii and the lower 48 states in the same, continuous view—though Hawaii’s Leeward Islands are cut off (as are the various territories). Can’t have everything, I guess. It’s available from the USGS as a free downloadable PDF; the paper version costs $9. [MapPorn]
Cartographers in the Field: “This Depression-era oil painting was created by USGS field man Hal Shelton in 1940. The painting depicts mapping techniques used in the early days of cartography, including an alidade and stadia rod for determining distances and elevations and a plane-table for sketching contour lines. A USGS benchmark is visible near the top. The straight white lines represent survey transects. Note the ‘US’ marking on the canteen: many of the USGS field supplies were obtained from Army surplus.” [Osher Map Library]
Quite the dramatic animation from the USGS’s Office of Water Information: it shows not only Hurricane Irma’s path through Florida, but also the total accumulated rainfall and stream gauge height. As the path of the hurricane moves across the U.S. mainland, the map erupts in the blue that shows total rainfall.
“For the past number of years, I have been collecting the U.S.G.S.’s maps, treating them as eminently affordable pieces of American art,” writes Tom Vanderbilt in the New York Times Magazine. “The beauty intrinsic to these maps is the byproduct of an entirely different mode of production, the last gasp of an antiquated way of representing the world.” [Gretchen Peterson]
The Michigan State University Map Library now has on display three copper plates used to make the 1912 USGS topographic map of the Lansing, Michigan area. “From the 1880s to the 1950s, the U.S. Geological Survey used engraved copper plates in the process of printing topographic and geographic quadrangle maps. Copper alloy engraving plates were inscribed with a mirror image of the points, contour lines, symbols, and text that constitute a topographic map. Each plate was inscribed with details for a single color of ink.” [via]
A new geologic map of Alaska has been published by the U.S. Geological Survey. From the USGS release: “This map is a completely new compilation, carrying the distinction of being the first 100 percent digital statewide geologic map of Alaska. It reflects the changes in our modern understanding of geology as it builds on the past. More than 750 references were used in creating the map, some as old as 1908 and others as new as 2015. As a digital map, it has multiple associated databases that allow creation of a variety of derivative maps and other products.” The map is available traditionally in two PDF sheets, as well as in geodatabase, Shapefile and other database formats.