Dean B Gesch

One Meter Topobathymetric Digital Elevation Model for Majuro Atoll, Republic of the Marshall Islands, 1944 to 2016

Located in the northern tropical Pacific Ocean, Majuro is the capital of the Republic of the Marshall Islands. Majuro Atoll consists of a large, narrow landmass and a set of smaller perimeter islands surrounding a lagoon that is over 100 square miles in size. The waters surrounding the Majuro Atoll land areas are relatively shallow with poorly mapped bathymetry. However, the Pacific Ocean on the exterior of the coral atoll and the lagoon within its interior consist of deep bathymetry with steep slopes. The highest elevation of the Majuro Atoll is estimated at only 3-meters above sea level, which is the island community of Laura located on the western part of the atoll. At the eastern edge of the atoll lies the capital...

Categories: Data; Tags: 3D Elevation Program, 3DEP, American Society of Photogrammetry and Remote Sensing, Base Maps, Bathymetric, All tags... Bathymetry, Calalin, Calalin Channel, CoNED, Coastal National Elevation Database, Coastal Zone, DEM, DTM, Digital Elevation Model, Digital Terrain Model, Djarrit, Earth Cover, Geography, Geomorphology, Hydrologic, Hydrologic Modeling, Information Sciences, Laura, Lidar Bathymetry, Light Detection and Ranging, Majuro, Majuro, Majuro Atoll, Majuro Atoll, Majuro Atoll, Majuro Atoll, Multi-beam Sonar, National Standards for Spatial Digital Accuracy, Pacific Islands, Pacific Ocean, RMI, Remote Sensing, Republic of the Marshall Islands, Republic of the Marshall Islands, Republic of the Marshall Islands, Republic of the Marshall Islands, Rita, SDB, Satellite-derived bathymetry, SfM, Single-beam Sonar, Structure from Motion, TBDEM, Topobathy, Topobathymetric, Topobathymetric Digital Elevation Model, Topobathymetric Lidar, U.S., U.S. Geological Survey, USA, USGS, USGS Science Data Catalog (SDC), United States, Water Resources, Western Pacific, Western Pacific Islands, lidar, Fewer tags

Inundation Exposure Assessment for Majuro Atoll, Republic of the Marshall Islands

Low-lying island environments, such as the Majuro Atoll in the Republic of the Marshall Islands, are particularly vulnerable to inundation (coastal flooding) whether the increased water levels are from episodic events (storm surge, wave run-up, king tides) or from chronic conditions (long term sea-level rise). Land elevation is the primary geophysical variable that determines exposure to inundation in coastal settings. Accordingly, coastal elevation data are a critical input for assessments of inundation exposure and vulnerability. Previous research has demonstrated that the quality of data used for elevation-based assessments must be well understood and applied to properly model potential impacts. The vertical...

Categories: Data; Tags: Atoll, Calalin Channel, Central Pacific, Coastal Flooding, Djarrit, All tags... Episodic Events, Geography, Inundation Vulnerability, King Tides, Laura, Majuro, Majuro Atoll, Pacific Islands, Pacific Ocean, Remote Sensing, Republic of the Marshall Islands, Sea Level Rise, Topobathymetric Digital Elevation Model (TBDEM), USGS Science Data Catalog (SDC), Vertical Uncertainty, boundaries, elevation, geoscientificInformation, Fewer tags

The Intergovernmental Panel on Climate Change reports that low-lying atolls (ring-shaped islands or island chains made of coral) in the Pacific Ocean are extremely vulnerable to high tide events (“king tides”), storm surge, tsunamis, and sea-level rise. The Republic of the Marshall Islands (RMI) spreads over 29 atolls and has a population of over 50,000 people with homes and communities that may be threatened by these climate change-related events. Policy makers, planners, and others within RMI are faced with decisions about how to prepare for the future and need scientific data and information about the vulnerability of Pacific Islands to potential climate change impacts like sea-level rise. Topographic and bathymetric...

Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 2016, CASC, Completed, Data Visualization & Tools, Data Visualization & Tools, All tags... Drought, Fire and Extreme Weather, Drought, Fire and Extreme Weather, Extreme Weather, Extreme Weather, Landscapes, Landscapes, Other Landscapes, Other Landscapes, Pacific Islands, Pacific Islands CASC, Projects by Region, Science Tools for Managers, Science Tools for Managers, Sea-Level Rise and Coasts, Sea-Level Rise and Coasts, Water, Coasts and Ice, Water, Coasts and Ice, Fewer tags

Chesapeake Bay Region Virginia River Bluff and Wetland Extent Mapping - 2020 Field Survey Data

U.S. Geological Survey (USGS) and Virginia Institute of Marine Science (VIMS) scientists conducted field data collection efforts during June 11th - 16th, 2020, using a combination of remote sensing technologies to map riverbank and wetland topography and vegetation at five sites in the Chesapeake Bay Region of Virginia. The five sites are located along the James, Severn, and York Rivers. The work was initiated to evaluate the utility of different remote sensing technologies in mapping river bluff and wetland topography and vegetation for change detection and sediment transport modeling. The USGS team collected Global Navigation Satellite System (GNSS), total station, and ground based lidar (GBL) data while the VIMS...

Tags: Bathymetry, Captain Sinclair's Recreational Area, Carter's Grove, Chesapeake Bay, Chippokes Plantation State Park, All tags... CoNED, Coastal National Elevation Database Applications Project, EROS, Earth Resources Observation and Science Center, Elevation, GBL, GNSS, Global Navigation Satellite System, Gloucester Point, Glouster County, Ground Based Lidar, James City County, James River, King and Queen County, Lands End, Lidar, Light Detection and Ranging, Mobjack Bay, Mount Folly, River Bluffs, SDB, Satellite Derived Bathymetry, Severn River, SfM, State of Virginia, Structure from Motion, Surry County, TLS, Terrestrial Laser Scanning, Topography, Total Station, UAS, UAV, VIMS CCRM, Virginia Institute of Marine Science, Virginia Institute of Marine Science Center for Coastal Resources Management, Wetlands, York County, York River, York River State Park, elevation, Fewer tags

With an average elevation of just seven feet above sea level, the Republic of the Marshall Islands is acutely vulnerable to inundation from both episodic events such as storm surge and chronic conditions such as sea-level rise. Some projections estimate that future sea-level rise could exceed the average elevation of these islands by 2100. Already, residents are facing extreme high tides and 16 foot swells that flood the islands with saltwater, damaging homes and infrastructure and contaminating the freshwater supply. Land elevation is the primary factor that determines the vulnerability of coastal areas to inundation. This project builds on previous work in which a 1-meter resolution digital elevation model (DEM)...

Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 2017, CASC, Completed, Data Visualization & Tools, Data Visualization & Tools, All tags... Drought, Fire and Extreme Weather, Drought, Fire and Extreme Weather, Extreme Weather, Extreme Weather, Landscapes, Landscapes, Other Landscapes, Other Landscapes, Pacific Islands, Pacific Islands CASC, Projects by Region, Science Tools for Managers, Science Tools for Managers, Sea-Level Rise and Coasts, Sea-Level Rise and Coasts, Water, Coasts and Ice, Water, Coasts and Ice, Fewer tags