T-Sheets Historical Habitats

Aug 3, 2016 (Last modified Jul 12, 2019)
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Description:
This historical dataset is derived from historical U.S. Coast Survey T-sheets. It was used to assess the extent and variety of historical wetlands and streams along the southern California coast.

Under the direction of some of the leading American scientists of the 19th century, the United States Coast Survey (USCS) created exceptionally accurate and detailed maps of the country's coastline. These surveys (commonly referred to as "T-sheets") are the single most important data source for understanding the physical and ecological characteristics of the US shoreline prior to substantial Euro-American modification. Their depictions of coastal wetlands and estuaries prior to major development are valuable tools for coastal zone planning and estuary management and form an important foundation for more detailed investigations of historical extent and condition of coastal wetlands.
Please visit http://www.caltsheets.org for more information, including links to the associated reports: Wetlands of the Southern California Coast: Historical Extent and Change over Time (Stein et al. 2014), and Historical Wetlands of the Southern California Coast: An Atlas of U.S. Coast Survey T-Sheets, 1851-1889 (T-Sheet Atlas) (Grossinger et al. 2011).
This dataset was created based on expert interpretation of georeferenced T-sheets spanning the entire coastline of Southern California. Mapping methodology is described in detail in Stein et al. 2014. This dataset (phase 2) updates and replaces earlier GIS datasets created for, and distributed concurrently with the 2011 T-sheet Atlas (phase 1).


Data Provided By:
T-sheets were originally surveyed in the 1800s by the U.S. Coast Survey and are provided courtesy of the National Oceanic and Atmospheric Administration.

The project was implemented by the The Southern California Coastal Water Research Project (SCCWRP), the San Francisco Estuary Institute (SFEI) and the Center for Geographic Studies at California State University, Northridge (CSUN).

Content date:
not specified
Citation:
San Francisco Estuary Institute (SFEI), Southern California Coastal Water Research Project (SCCWRP) and the Center for Geographic Studies at California State University, Northridge (CSUN). 2014. "Southern California T-Sheets GIS Data." Accessed [date retrieved]. http://www.caltsheets.org/socal/. [Georeferenced T-sheets should be cited using the original surveyors, date, and title]. U.S. Coast and Geodetic Survey (USCGS). Courtesy of National Oceanic and Atmospheric Administration (NOAA).]Su - See more at: http://www.sfei.org/content/historical-wetlands-southern-california-coast-gis-data#sthash.PTSGCcnU.nW0XyRUo.dpuf
Contact Organization:
http://www.caltsheets.org/
Contact Person(s):
not specified
Use Constraints:
As with any map or GIS layer, confidence or certainty varies geographically due to differences in source data or methods. This geodatabase provides direct information about the certainty level of different areas and features to allow the user to intelligently assess the applicability of the data for the chosen technical question. In no event shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use (or the inability to use it). These data are not legal documents or of survey quality and are not intended to be used as such. Although extensive effort has been made to produce error-free and complete data, all geographic information has limitations due to the scale, resolution, date and interpretation of the original source materials. Users should consult available data documentation (metadata) for these particular data to determine limitations and the precision to which the data depict distance, direction, location or other geographic characteristics. Data may be subject to change without prior notification. If this data is modified, changes should be documented in a metadata record that should accompany all redistributed data. If data is transmitted or provided in any form to another user, the data must be accompanied by a copy of this disclaimer and all documentation provided with the original data set, including the full metadata record. We request that the use of these data in any map, publication, or report should cite the data source(s) used and give proper attribution and credit to the originators of the data.
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Tags:
topographic, coast, tsheet, topography, wetland, coast survey, historical, channel, t-sheet, california, habitat
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Conservation Biology Institute

The Conservation Biology Institute (CBI) provides scientific expertise to support the conservation and recovery of biological diversity in its natural state through applied research, education, planning, and community service.