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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
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.
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 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.
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
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.
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