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Posted by: Meagan Snow
Andersonville Prison, arguably the most horrific Confederate prison for Union soldiers, was constructed in 1864 during the US Civil War and was located a little over a hundred miles south of Atlanta, Georgia. The prison was constructed as an open-air stockade with walls made of pine logs at least fifteen feet high. During its fourteen …
Posted in: 19th century cartography, American History
Posted by: Meagan Snow
Flow maps are characterized by representing direction and amount of movement between an origin and a destination – and Charles Joseph Minard is widely regarded as the first cartographer who mastered the art of the flow map. He is best known for his flow map of Napolean’s 1812 invasion of Russia titled “Carte figurative des …
Posted in: 19th century cartography, American History
Posted by: Meagan Snow
Have you ever wondered how historic maps can be used with today’s modern mapping technologies? One of the ways in which analog maps can be used with GIS (Geographic Information Systems) is through a process called georeferencing. Georeferencing is the process of adding digital spatial reference information to an otherwise non-spatial image. Adding spatial reference …
Posted in: Big Data and Visualization, Geographic Information Science
Posted by: Meagan Snow
Let’s journey back a hundred years in time to the downtown streets of Seattle, Washington. On a clear day, you can see the Olympic Mountains from the fish markets along Railroad Avenue. Eddie Carlson, who will one day bring the 1962 World’s Fair – and the Space Needle – to Seattle, is now just a …
Posted in: 20th century cartography
Posted by: Meagan Snow
Though much of the history of cartography involves map-makers striving to capture the world in increasingly accurate scientific detail, sometimes the domain of the map-maker is to capture the plane of imagined, metaphorical, allegorical, or even spiritual. Such is the journey you’ll take on the “Gospel Temperance Railroad,” a 1908 map creation by George E. …
Posted in: 20th century cartography, American History
Posted by: Meagan Snow
Today it’s easy to check the weather without even leaving the house: hourly predictions for rain, wind, temperature, and humidity are available to most of us through our phones at the touch of a button. Warnings for severe weather flash across our screens to help keep us safe – but how did we get here? …
Posted in: 19th century cartography, 20th century cartography, Geographic Information Science
Posted by: Meagan Snow
This is a guest post by Meagan Snow, Geospatial Data Visualization Librarian in the Geography and Map Division. Whether you’ve used an online map to check traffic conditions, a fitness app to track your jogging route, or found photos tagged by location on social media, many of us rely on geospatial data more and more …
Posted in: 21st century cartography, Geographic Information Science