The mapped area was extended to the shoreline by generating a DEM using USACE NCMP lidar data collected in 2009 (USACE, unpub. data), with gaps filled by data from Barnard and Hoover (2010). These elevation data were then used to generate a shoreline at the NAVD88 +1.33 m contour, defined as the operational MHW shoreline by Weber and others (2005). The resulting boundary was transformed to WGS 84 UTM Zone 11 North in ArcGIS 10 using the NAD83 to WGS84 (ITRF00) transformation algorithm. This boundary was then used to extend and trim both onshore and offshore geology in the print and PDF product. The transformed boundary is contained within the WGS84 "contacts" feature class and identified as a shoreline in the associated representation rules.
Only data for offshore map units are released digitally in this publication. For onshore geology see Dibblee (1986a, 1986b, 1986c and 1986d), and Minor and others (2009).
References Cited:
Barnard, P.L., and Hoover, D., 2010, A seamless, high-resolution coastal digital elevation model (DEM) for southern California: U.S. Geological Survey Data Series 487, 8 p., and database (
http://pubs.usgs.gov/ds/487/).
Clahan, K.B., 2003, Geologic map of the Oxnard 7.5' quadrangle, Ventura County, California--A digital database:
California Geologic Survey Preliminary Geologic Map, accessed April 5, 2011, at
http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Dibblee, T.W., Jr., 1981a, Geologic map of the Tajiguas quadrangle, California: U.S. Geological Survey Open-File Report 81–371, scale 1:24,000.
Dibblee, T.W., Jr., 1981b, Geologic map of the Gaviota quadrangle, California: U.S. Geological Survey Open-File Report 81–374, scale 1:24,000.
Dibblee, T.W., Jr., 1981c, Geologic map of the Santa Ynez quadrangle, California: U.S. Geological Survey Open-File Report 81–373, scale 1:24,000.
Dibblee, T.W., Jr., 1981d, Geologic map of the Solvang quadrangle, California: U.S. Geological Survey Open-File Report 81–372, scale 1:24,000.
Minor, S.A., Kellogg, K.S., Stanley, R.G., Gurrola, L.D., Keller, E.A., and Brandt, T.R., 2009, Geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California: U.S. Geological Survey Scientific Investigations Map 3001, scale 1:25,000, 1 sheet, pamphlet 38 p., available at
http://pubs.usgs.gov/sim/3001/.
Weber, K.M., List, J.H., Morgan, K.L., 2005, An operational Mean High Water datum for determination of shoreline position from topographic lidar data: U.S. Geological Survey Open-File Report 2005-1027 (
http://pubs.usgs.gov/of/2005/1027/).