Name: Volume above 1 m elevation per meter alongshore
Display Field: site
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: Volume of sediment in the beach and dune system above 1 meter of elevation per meter alongshore calculated from 2019 lidar digital elevation model.
Description: Shorelines are the dynamic boundary between land and water. The Bureau maintains a digital database that contains numerous shoreline positions for the Gulf of Mexico coastline and select Texas Bays that are used to calculate rates of shoreline change. These shorelines come from numerous sources including photography, GPS, and lidar.
Description: Vegetation line positions mapped by Ball High School students using hand-held GPS units. Data is collected during field trips for the Texas High School Coastal Monitoring Program.
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Description: Shoreline positions mapped by Ball High School students using hand-held GPS units. Data is collected during field trips for the Texas High School Coastal Monitoring Program.
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Description: Digitized maps detailing active processes, physical properties, environmental geology, and environments & biologic assemblages from the Bureau’s Environmental Geologic Atlas of the Texas Coastal Zone series for the Galveston-Houston area. (Fisher and others, 1972).
Description: Outlines the major physical processes that are critical for determining land use. Main map features in GISP include areas inundated by Hurricanes Carla (1961) and Beulah (1967) and the active shoreline zones.
Description: <p>This layer groups geologic, biologic, active processes, and man-made map units into groups that have common physical features and properties. </p><dl><dt>Group II</dt><dd>Geologic units include beach, foredunes, barrier vegetated flats. Dominantly sand, high to very high permeability, low water-holding capacity, low compressibility, low shrink-swell potential, good drainage, low ridge and depressed relief, high shear strength, low plasticity. </dd><dt>Group VI</dt><dd>Geologic units include tidal flat and salt marsh. Permanently high water table, very low permeability, high water-holding capacity, very poor drainage, very poor load-bearing strength, subject to frequent tidal inundations.</dd></dl>
Description: Map delineating environmental geologic units found in GISP. The depositional units represented within the park are formed during the Modern-Holocene period (last 10,000 years) in a barrier-strandplain or offshore setting.
Description: <p>This layer characterizes bottom-living plants and animals in Galveston Bay and principal plant communities within the park. </p><dl><dt>Grassflats</dt><dd>Shallow bay margin with dense grasses, moderately diverse mollusk assemblage, depth <5 feet.</dd><dt>Bay with Reef</dt><dd>Enclosed bay with reef, away from tidal or river influence, mottled mud, high species diversity, infauna, mollusks, scattered clumps of oyster reefs, depth 3 to 8 feet.</dd><dt>Fresh to brackish-water bodies</dt><dd>Land-locked ponds and lakes, variable substrates, coastal bodies temporarily brackish or saline</dd><dt>Beach</dt><dd>Low tide to 5 feet above sea level, beach, swash zone, high energy, sand, shell debris infauna, back-beach sea-oats and halophytes, dunes, ghost crab. </dd><dt>Barrier flat and dune</dt><dd>vegetated barrier flat, foredune ridge, beach ridge, and vegetated flat, relief 5 to 15 feet, salt-tolerant grasses, rare mesquite and live oak-trees, ghost crab, small rodents, snakes, fowl.</dd><dt>Tidal flats</dt><dd>Sandflats, a few inches above mean sea level, undulatory sand surface with blue-green algal mats, thin halite film, marsh plants rare</dd><dt>Salt-water marsh</dt><dd>Salt-water marsh, frequently inundated by tides, sand, muddy sand to mud, cordgrass, glasswort, seepweed, sea-oxeye, mammals, fowl.</dd></dl>
Description: This layer depicts the surficial geologic units found in GISP mapped from field investigations, digital elevation models, and 2022 aerial photography. All units within the park are late Holocene in age (<5,000 years) and represent bay-margin marsh, beach, and tidal flat and Gulf-margin beach, barrier flat, dune, ridge and swale.
Description: <p>Wetland and aquatic habitats are essential components of inland and barrier island environments along the Texas coast. These layers contain coastal wetland habitat from 1956, 1979, 2002, and 2022 interpreted from historical and recent aerial photographs. Wetlands are classified by system (marine, estuarine, riverine, palustrine, lacustrine), subsystem (reflective of hydrologic conditions), and class (descriptive of vegetation and substrate). Maps for 1979 and the 2000’s were additionally classified by subclass (subdivisions of vegetated classes only), water regime, and special modifiers. </p><p>Data in the 1956, 1979, and 2002 layers were mapped through the Bureau’s status and trends of wetlands and aquatic habitats studies (<a href="https://www.beg.utexas.edu/research/programs/coastal/wetlands/galveston-island-and-bolivar-peninsula" target="_blank">https://www.beg.utexas.edu/research/programs/coastal/wetlands/galveston-island-and-bolivar-peninsula</a>).</p>
Description: A digital elevation model (elevation of the ground surface) constructed from airborne lidar data collected for the Texas Strategic Mapping (StratMap) program in 2018 (<a href="https://tnris.org/stratmap/elevation-lidar.html" target="_blank">https://tnris.org/stratmap/elevation-lidar.html</a>).