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Digital elevation model of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015 This USGS data release presents data collected from bathymetric and topographic surveys and the resulting digital elevation model for Little Holland Tract in the Sacramento-San Joaquin River Delta, California. During May and June of 2015, a team of scientists from the USGS Pacific Coastal and Marine Science Center (PCMSC) conducted multiple surveys (USGS Field Activity 2015-642-FA) to collect topographic and bathymetric data in Little Holland Tract, located in the Sacramento-San Joaquin River Delta between Liberty Island and the Sacramento Deep Water Ship Channel. Topographic data were collected by survey personnel on foot, and bathymetric measurements were collected using two personal watercraft (PWC). Positioning... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Geophysics, PCMSC, Sacramento-San Joaquin Delta, bathymetry measurement, data release, All tags... digital elevation models, Fewer tags