Albany 1948 125k Topo
This map is kind of interesting as it shows how people used to get around Albany before the modern interstate highway system. Look carefully at this map and you'll see how many lanes the various arterial where in 1948.
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This map is kind of interesting as it shows how people used to get around Albany before the modern interstate highway system. Look carefully at this map and you'll see how many lanes the various arterial where in 1948.
Looks like a mid-day pass, relatively free of clouds.
Afternoon satellite imagery, showing the march of green heading north.
In the late 19th century, surveyors created topographic maps in the field. They measured a series of points in the field, using tape and compass traverses with elevations determined with an aneroid barometer and used in a process known as field sketching to draw a terrain representation using contours. The introduction of the plane table and alidade, which could measure vertical angles, point positions, and elevations much more rapidly, greatly increased the accuracy of data shown on topographic maps but still required the surveyor to field sketch the contours after control points had been identified. The aid of a visual three-dimensional model in the office to construct the surface representation awaited the development of photogrammetry.
During this time, USGS maps were created at scales of 1:250,000 for 1-degree areas and 1:125,000 for 30-minute areas. The scales were increased with time, and by 1894, most of the maps were created for 15-minute areas and produced at a scale of 1:62,500. Features shown on the maps included civil divisions of state, county, township, and city or village; public works, including railroads, tunnels, wagon roads, trails, bridges, ferries, fords, dams, canals, and acequias; hypsography with contours and floodplain representations; and miscellaneous features of forest, sand, and sand dunes.
The reproduction of maps from the original field sketches used a lithographic printing process based on copper plates. The image of the topographic features was engraved on the copper plates. A three-color process was used with civil divisions and public works in black, hydrography in blue, and hypsography and miscellaneous features in brown.
June is Dairy Month. This interactive map shows the total milk sales per county for all the counties that have multiple dairy farms. It is based on 2012 USDA Ag Census.
Data Source: USDA/NASS Quick Stats. https://quickstats.nass.usda.gov/