Abstract
Georectification and Interpretation of Historical Maps on California Coast
Track: Cartography and Map Production
Author(s): Kristen Cayce
Knowledge of historical landscapes is a key component in modern day habitat restoration, resource planning and management efforts. Digital data of historical ecosystems are limited though many sources exist as paper maps, images and documents. Beginning in the mid-1800’s, the US Coast Survey produced some of the first accurately drawn topographic maps (Tsheets) using the most sophisticated geographic techniques of the time. These documents provide insight into the past, but also prove to be a challenge in interpretation and georectification. Georectification into a modern coordinate system and interpretation of non-standard symbology are accomplished though innovative techniques and complimentary resources. This presentation will discuss the georectification process by which the Tsheets were given modern spatial coordinates, the overall accuracy of the original mapping, and the Tsheet symbology interpretation.
Kristen Cayce
San Francisco Estuary Institute
7770 Pardee Lane
2nd floor
Oakland , California 94621
United States
Phone: 510-746-7342
E-mail: kristen@sfei.org