Bruce Jaffe 2007 tabular digital data Foxgrover, A., Jaffe, B., Hovis, G., Martin, C., Hubbard, J., Samant, M., and Sullivan, S. 2007 Open-File Report 2007-1163 Menlo Park, CA U.S. Geological Survey http://pubs.wr.usgs.gov/of/2007/1163 XYZ ASCII format data generated from the 2005 single beam acoustic bathymetric survey of South San Francisco Bay, CA. Z-values provided relative to the North American Vertical Datum of 1988 (NAVD88) and to Mean Lower Low Water (MLLW) of the 1983-2001 national tidal datum epoch where possible. Funding provided by the California Coastal Conservancy and survey collected by Sea Surveyor, Inc. of Benicia, CA. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with Geographic Information Systems (GIS) or other software to display bathymetry data of South San Francisco Bay, CA. >Bounding ccordinates for ivdividual zones are as follows. > >Zone 31 West: -122.24, East: -122.18, North: 37.70, South: 37.67 >Zone 33 West: -122.31, East: -122.24, North: 37.67, South: 37.62 >Zone 34 West: -122.25, East: -122.17, North: 37.69, South: 37.64 >Zone 35 West: -122.28, East: -122.16, North: 37.67, South: 37.61 >Zone 36 West: -122.33, East: -122.25, North: 37.64, South: 37.59 >Zone 37 West: -122.31, East: -122.15, North: 37.66, South: 37.57 >Zone 38 West: -122.26, East: -122.15, North: 37.62, South: 37.55 >Zone 39 West: -122.23, East: -122.14, North: 37.60, South: 37.53 >Zone 40 West: -122.20, East: -122.12, North: 37.57, South: 37.51 >Zone 42 West: -122.17, East: -122.11, North: 37.55, South: 37.49 >Zone 43 West: -122.13, East: -122.09, North: 37.52, South: 37.47 >Zone 44 West: -122.12, East: -122.05, North: 37.50, South: 37.45 >Zone 46 West: -122.06, East: -122.03, North: 37.46, South: 37.45 >Zone 47 West: -122.34, East: -122.92, North: 37.47, South: 37.46 >Zone 48 West: -122.01, East: -121.98, North: 37.47, South: 37.46 >Zone 49 West: -121.98, East: -121.96, North: 37.47, South: 37.47 >Zone 50 West: -121.98, East: -121.97, North: 37.46, South: 37.46 >Zone 51 West: -121.96, East: -121.95, North: 37.48, South: 37.47 >Zone 52 West: -121.97, East: -121.95, North: 37.47, South: 37.46 >Zone 53 West: -121.97, East: -121.96, North: 37.46, South: 37.45 >Zone 54 West: -121.97, East: -122.00, North: 37.45, South: 37.44 >Zone 55 West: -122.02, East: -122.01, North: 37.46, South: 37.45 >Zone 56 West: -122.00, East: -121.99, North: 37.45, South: 37.43 >Zone 57 West: -121.99, East: -121.98, North: 37.43, South: 37.42 >Zone Upper Mud West: -121.95, East: -121.93, North: 37.47, South: 37.45 >Zone Upper Coyote West: -121.95, East: -121.95, North: 37.48, South: 37.48 >Zone Upper Artesian West: -121.96, East: -121.96, North: 37.44, South: 37.44 >Zone QC Lines West: -122.31, East: -122.12, North: 37.69, South: 37.51 20050110 20050405 publication date Complete None planned -122.34 -121.92 37.70 37.42 None Marine Geology Bathymetry Hydrographic Survey Water Depth Bay Floor Topography elevation U.S. Geological Survey USGS Coastal and Marine Geology Program ISO 19115 Topic Category oceans and estuaries geoscientificinformation elevation Global Change Master Directory (GCMD) EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY EARTH SCIENCE > OCEANS > COASTAL PROCESSES INSTRUMENTS > EARTH REMOTE SENSING > ACTIVE REMOTE SENSING > PROFILERS/SOUNDERS > ACCOUSTIC SOUNDERS None South San Francisco Bay CA Northern California USA Geographic Names Information System (GNIS) San Francisco Bay California None Please recognize the U.S. Geological Survey (USGS) and the California Coastal Conservancy as the source of this information. USGS-authored or produced data and information are in the public domain. Bruce Jaffe U.S. Geological Survey, Coastal and Marine Geology Physical Oceanographer mailing and physical address

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Santa Cruz CA 95060-5792 USA (831) 427-4742 (831) 427-4748 bjaffe@usgs.gov http://walrus.wr.usgs.gov/infobank/b/b105sf/html/b-1-05-sf.nav.html Image showing location and extent of B-1-05-SF data. GIF U.S. Geological Survey, Coastal and Marine Geology Program 2007 http://walrus.wr.usgs.gov/infobank/b/b105sf/html/b-1-05-sf.meta.html To make the soundings comparable to historical data, water depths were measured and corrected for tide using the same methods as used during the more recent of the historical surveys of South San Francisco Bay. Soundings were collected using a single-beam, survey-grade depthfinder having the same frequency and beam-width as used during the more recent of the historical surveys. Soundings were corrected to the MLLW vertical datum using tide data measured at the same location and reduced by the same organization (NOAA) as historical surveys. Soundings from the hydrographic survey are in meters referenced to two separate vertical datum, including MLLW and NAVD-88. USGS will compare soundings referenced to MLLW to historical NOS surveys of South San Francisco Bay, and merge soundings referenced to NAVD-88 with the May 2004 LIDAR topographic data to create a terrain model of existing land surface elevation and bay bathymetry. Soundings were collected during periods of high tide in order to optimize Òbank-to-bankÓ coverage of South Bay tidal flats, and provide maximum overlap with the aerial topographic LIDAR data collected months earlier during periods of low tide. Soundings were collected across South San Francisco Bay along tracklines spaced at nominal 100m intervals and oriented in a southwest-northeast direction (perpendicular to the general bathymetric contour of the seafloor). Survey tracklines were divided into tide zones defined by NOAA (2006), with 100m overlap into adjacent zones. Dividing the tracklines into tide zone simplified processing the soundings and provided a QC check in the overlap area around tide zone boundaries. Unless obstructions were encountered, soundings near the shoreline extend to elevation +0.3m MLLW or higher. When practical, soundings were collected around obstructions to complete sounding lines. Overlap between survey areas and cross-lines (tielines) are provided for quality-control assessment of the soundings. Soundings were collected during all stages of the tide, provided that sufficient water depth was available for safe navigation. Areas shallower than Ð1m MLLW were surveyed during periods of extreme high tides when the water surface elevation is +1.75m MLLW or higher. Areas deeper than Ð3m MLLW were surveyed during all stages of the tide (high and low), but always during periods of ÒneapÓ tides when the water surface elevation changes less than 1.25m between high and low tides. Survey lines terminated early because of shallow water during low or moderate tides were re-surveyed during extreme high tides in order to collect soundings as far upland as possible. For QC purposes, survey lines terminated early at low tide are re-surveyed at high tide with a minimum 100m overlap. +/- 3 meters in the bay, +/- 6 cm; in the sloughs and creeks, +/- 15 cm. Depths reduced to MLLW vertical datum. The single beam bathymetric data was collected using an INNERSPACE Model 455 survey-grade depthfinder with 3-degree, 200kHz transducer. The depthfinder collects 20 soundings/second typically resulting in a nominal spacing of 0.15m along trackline. Tracklines are oriented perpendicularly to the slope of the bay floor and spaced 100 m apart. The data were reduced to the Mean Lower Low Water (MLLW) datum of the 1983 to 2001 epoch using a tidal reduction scheme created by NOAA consisting of specific time and range corrections for discrete zones within South SF Bay. After reducing the soundings to a common vertical datum, they were thinned to 1 m spacing along tracklines. (Reduction methodologies for soundings collected in Coyote Creek and the adjacent sloughs varied, please see details contained in the body of OF-1163). NOAA also calculated offset values for the difference between the tidal datum of MLLW and the geodetic datum of NAVD88. This offset was calculated for all zones except 51-54. All soundings except those in zones 51-54 are available relative to MLLW and soundings for the entire survey are available relative to NAVD88. Seperate X,Y,Z ASCII files for each vertical datum are provided. 20070504 Bruce Jaffe U.S. Geological Survey, Coastal and Marine Geology Physical Oceanographer mailing and physical address

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Santa Cruz CA 95060-5792 USA (831) 427-4742 (831) 427-4748 bjaffe@usgs.gov Point Universal Transverse Mercator 10 0.999600 -123.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters NAD83 GRS80 6378137.000000 298.257222 >Sample of Bathymetry XYZ ASCII file >X(UTM, m), Y(UTM, m), Depth(m, MLLW) > >571247.445, 4172178.538, -0.213 >571246.972, 4172179.416, -0.213 >571246.452, 4172180.270, -0.274 >571245.662, 4172180.879, -0.305 >571244.849, 4172181.458, -0.335 >571243.978, 4172181.944, -0.335 >571243.130, 4172182.460, -0.396 >571242.222, 4172182.875, -0.427 >571241.337, 4172183.342, -0.457 >571240.447, 4172183.797, -0.518 none U.S. Geological Survey, Coastal and Marine Geology Bruce Jaffe mailing and physical address

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Santa Cruz CA 95060-5792 USA (831) 427-4742 These data not intended for navigational purposes. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, US DOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. 20070504 Amy Foxgrover U.S. Geological Survey, Coastal and Marine Geology Geographer mailing and physical address

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Santa Cruz CA 95060-5792 USA (831) 427-4743 (831) 427-4748 afoxgrover@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998