Archive: January 2023 (2 Posts)

Refined by: (Author) Julie Stoner; (Year) 2023; (Month) January

A close up of a topographic map of Pittsburgh Pennsylvania. Map is shades of orange and red with a river through the middle and buildings shown with black rectangles.

Digital Image Processing: It’s All About the Numbers

January 26, 2023

This is a guest post by Rachel Trent, Digital Collections and Automation Coordinator in the Geography and Map Division. Every time you look at an online image of a historical map, what you’re viewing is really just a spreadsheet of numbers. Or more likely, three spreadsheets, one each for red, green, and blue (the technical way to …

Posted in: 20th century cartography, 21st century cartography

A Year in Review: Newly Scanned Maps of 2022

January 5, 2023

Posted by: Julie Stoner

On the Geography and Map Division home page, we keep a list of maps newly placed online. As has become tradition (see previous Year in Review posts), to celebrate the end of a year and to ring in the new, I take a look back at the digitized maps that are now available online from …

Posted in: 19th century cartography, 20th century cartography, Series: A Year in Review

Refined by: (Author) Julie Stoner; (Year) 2023; (Month) January