US 12,474,178 B2
Transforming and navigating historical map images
Ivan Augusto Sanchez-Rosito, Spanish Fork, UT (US); Syed Zahid Khadri, Mountain View, CA (US); Marisa Brooke Jensen, Lehi, UT (US); Monica Niehaus, San Francisco, CA (US); Brett Johnson, Saratoga Springs, UT (US); and Kaleb Benjamin White, Herriman, UT (US)
Assigned to Ancestry.com Operations Inc., Lehi, UT (US)
Filed by Ancestry.com Operations Inc., Lehi, UT (US)
Filed on Feb. 23, 2023, as Appl. No. 18/113,427.
Claims priority of provisional application 63/321,412, filed on Mar. 18, 2022.
Prior Publication US 2023/0296398 A1, Sep. 21, 2023
Int. Cl. G01C 21/00 (2006.01)
CPC G01C 21/3807 (2020.08) [G01C 21/005 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A computer-implemented method, comprising:
loading a digital map;
loading an index comprising historical map metadata, wherein the historical map metadata comprise boundary coordinates of historical maps and identifiers of historical map images, the historical map images being digitalized images of physical maps;
receiving a user input interacting with the digital map;
determining, based on the user input, a view area of the digital map, the view area corresponding to a geographical area and a zoom level on the digital map;
looking up the index to determine one or more particular historical maps that fall within the view area of the digital map, looking up the index comprising examining whether the boundary coordinates of the historical maps fall within the geographical area corresponding to the view area at the zoom level;
retrieving, from a data source and based on the identifiers of historical map images stored in the index, one or more historical map images corresponding to the one or more particular historical maps that fall within the view area of the digital map; overlaying the one or more historical map images onto the digital map; and
loading a georeferenced shape polygon file, wherein the georeferenced shape polygon file comprises coordinates of polygons that correspond to districts in the historical maps, wherein the georeferenced shape polygon file comprises a plurality of polygons, and wherein each of the polygons is associated with a historical map district identifier and a historical map identifier from where the polygon is derived.