Topobathymetric Model of Mobile Bay, Alabama

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Publication_Date: Unpublished Material
Title: Topobathymetric Model of Mobile Bay, Alabama
Edition: first
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: USGS Data Series
Issue_Identification: XXXX
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: USGS Coastal and Marine
Description:
Abstract:
This 1/9 arc-second (approximately 3 meter) resolution dataset is a hybrid elevation model created from U.S. Geological Survey (USGS) topography data, including the National Elevation Dataset (NED), the Experimental Advanced Airborne Research Lidar (EAARL) data, the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) lidar data from the U.S. Army Corps of Engineers (USACE), and the National Oceanic and Atmospheric Administration's (NOAA) bathymetry data.
 
Purpose:
Topobathymetric data are a merged rendering of both topography (land elevation) and bathymetry (water depth) to provide a seamless elevation product useful for inundation mapping, as well as other earth science applications, such as the development of sediment-transport, sea level rise, and storm surge models. The main goal of this task is to support the creation of 1/9 arc-second (approximately 3 meter) Coastal National Elevation Dataset (CoNED)/ topobathymetric data. The central mission of the Coastal NED work is to systematically integrate the construction of topobathymetric elevation models into the formal NED structure at selected sites of high scientific interest and/or hazard vulnerability.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.685864
East_Bounding_Coordinate: -87.512037
North_Bounding_Coordinate: 30.845154
South_Bounding_Coordinate: 30.164969
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: DEM
Theme_Keyword: NED
Theme_Keyword: EAARL
Theme_Keyword: topography
Theme_Keyword: bathymetry
Theme_Keyword: topobathy
Theme_Keyword: seafloor
Theme_Keyword: water depth
Theme_Keyword: elevation
Theme_Keyword: coastal relief
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: inlandWaters
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Mobile
Place_Keyword: Mobile Bay
Place_Keyword: Alabama
Place_Keyword: Gulf of Mexico
Place_Keyword: Mobile County
Place_Keyword: Baldwin County
Place_Keyword: Southern Alabama
Access_Constraints: NOT TO BE USED FOR NAVIGATION.
Use_Constraints: NOT TO BE USED FOR NAVIGATION
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS EROS Center
Contact_Person: Jeffrey J. Danielson
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: USGS EROS, 47914 252nd Street
City: Sioux Falls
State_or_Province: SD
Postal_Code: 57198
Country: UNITED STATES
Contact_Voice_Telephone: 605-594-6148
Contact_Electronic_Mail_Address: daniels@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Map_ID-thumb.jpg
Browse_Graphic_File_Description: Small, color graphic of datset.
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Data_Set_Credit:
This topobathy model is a joint effort between the USGS Coastal and Marine Geology Program (CMGP), the USGS National Geospatial Program (NGP), and the USGS Earth Reources Observation & Science (EROS) Center.
Danielson, J.J., Brock, J.C., Howard, D.M., Gesch, D.B., Bonisteel-Cormier, J.M., Travers, L.J. 2012, Topobathymetric Data for Mobile Bay, Alabama: U.S. Geological Survey Data Series XXXX, 6 map sheets, scale 1:55,000 [<https://pubs.usgs.gov/DS/XXXX/]> <https://pubs.usgs.gov/DS/XXXX/]> .
Security_Information:
Security_Classification: Unclassified
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.4.4000
Time_Period_of_Content:
Currentness_Reference: publication date
Data_Quality_Information:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal accuracy of bathymetric and topographic features in the DEM is dependent upon DEM cell size and the accuracy of input datasets used to determine corresponding cell values. Positional accuracy of input bathymetric datasets limits accuracy of corresponding cell values in DEM.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The absolute vertical accuracy of the merged model ranges between +/- 6 to 20 centimeters for the topographic surface. Quality checks are built into the data-processing software.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2005 Post Hurricane Katrina-Topographic Infrared Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 6 cm RMSE.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2010 Baldwin County - Topographic Infrared Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 12.9 cm RMSE
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2002 Mobile County - Topographic Infrared Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 13.9 cm RMSE
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2011 Baldwin County - Topographic Infrared Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 15 cm RMSE
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2001 Baldwin County - Topographic Infrared Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 15 cm RMSE
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2007 EAARL - Bathymetric Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 15 cm RMSE
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2005 CHARTS - Bathymetric Lidar
Vertical_Positional_Accuracy_Explanation: Absolute Vertical Accuracy: 20 cm RMSE
Lineage:
Process_Step:
Process_Description:
Topobathymetric data are a merged rendering of both topography (land elevation) and bathymetry (water depth) to provide a seamless elevation product useful for inundation mapping, as well as other earth science applications, such as the development of sediment-transport, sea level rise, and storm surge models. Topo/Bathy Creation Steps: a.) Constructed a high-resolution shoreline for each pilot study area based upon the associated topographic lidar, bathymetry, and aerial photography data. The shoreline was aligned to the North American Vertical Datum of 1988 (NAVD 88) vertical reference frame.
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS EROS
Contact_Person: Jeffrey Danielson
Contact_Position: Geographer
Contact_Address:
Address_Type: unknown
City: Sioux Falls
State_or_Province: SD
Postal_Code: 57198
Country: US
Contact_Voice_Telephone: 605-594-6148
Hours_of_Service: M-F 9:00-4:00
Process_Step:
Process_Description:
b.) Converted tidally-referenced bathymetric data sources into the NAVD 88 vertical reference frame using VDatum. VDatum (<http://vdatum.noaa.gov>) is a tool developed by the National Geodetic Survey (NGS) that performs transformations among tidal, ellipsoid-based, geoid-based, and orthometric datums using calibrated hydrodynamic models. Utilized VDatum and other tools to perform any necessary standardization processing on bathymetric source data to confirm proper vertical and horizontal properties are applied. The National Ocean Service (NOS) (<http://oceanservice.noaa.gov/>) hydrographic, multibeam, and trackline surveys were transformed from MLLW and MLLWS to NAVD 88 using VDatum.
Process_Step:
Process_Description:
c.) Performed a quality assurance (Q/A) assessment on the input bathymetry data to review the points for data consistency and spurious anomalies. Prioritized and spatially sorted the bathymetry based on temporal frequency, spatial distribution, accuracy, and point density to eliminate any outdated or erroneous points and to minimize interpolation artifacts.
Process_Step:
Process_Description:
d.) Spatially interpolated bathymetric single beam, multibeam, and hydrographic survey source data using an adjustable tension continuous curvature surface gridding algorithm. This algorithm works similarly to that of a thin-plate spline algorithm. For the gridded bathymetry, a smoothing filter (FocalMean) was employed to minimize noise effects and to improve visual characteristics of the data.
Process_Step:
Process_Description:
e.) Performed a quality assurance (Q/A) assessment on the input lidar data to review the point cloud for spurious anomalies and to ensure that the point cloud has been post-processed to bare-earth. Checked the quality of the bare-earth processing to make sure urban built-up and vegetation areas are properly flattened. If the point cloud contains no classification then the lidar data must be processed to bare earth.
Process_Step:
Process_Description:
f.) Used triangulated irregular networks (TINs) to grid the input lidar source data using breaklines and associated terrain-based features at a 1/9 arc-second spatial resolution using linear interpolation. Extracted from the National Elevation Dataset (NED), all available 1/9 arc-second topographic datasets for the pilot area.
Process_Step:
Process_Description:
g.) Developed an integrated shoreline transition zone from the best available topographic and bathymetric data to blend the topographic and bathymetric elevation sources. Using the high-resolution shoreline, created a buffer to logically mask input topography/bathymetry data. Then, through the use of TINs and breaklines, interpolated the selected topographic and bathymetric points to gap-fill nearshore holes in the bathymetric coverage. Topobathymetric lidar data sources such as the Experimental Advanced Airborne Research Lidar (EAARL) or Compact Hydrographic Airborne Rapid Total Survey (CHARTS) systems provide up-to-date, high-resolution data along the critical land/water interface within intertidal zone.
Process_Step:
Process_Description:
h.) Spatially mosaicked the gridded lidar, bathymetric, and integrated shoreline transition zone raster data sources to create a seamless topobathymetric composite at a 1/9 arc-second resolution using a combination of methods such as, "blend" (spatial weighting) and "last input" in the overlapping regions of the mosaic.
Process_Step:
Process_Description:
i.) Generated spatially referenced metadata for each unique data source. The spatially reference metadata consists of a group of geospatial polygons that represent the spatial footprint of each data source used in the generation of the topobathymetric dataset. Each polygon was populated with attributes that describe the source data, such as, acquisition date and source name.
Logical_Consistency_Report:
Datasets were visually compared internally and externally (with other overlapping datasets and satellite images and maps) in ESRI ArcGIS for identification of anomalous elevations or data inconsistencies. Where elevation inconsistencies occurred, the most recent or highest resolution dataset was selected for use
Completeness_Report:
All available recent digital topographic and bathymetric datasets in the region were used in building the DEM.
Attribute_Accuracy:
Attribute_Accuracy_Report:
Accuracy of bathymetric and topographic features in the DEM are dependent upon the accuracy of the input datasets used to determine corresponding cell values.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 22038
Column_Count: 38032
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: unknown
Address: 47914 252nd Street
City: Sioux Falls
State_or_Province: SD
Postal_Code: 57198
Country: UNITED STATES
Contact_Voice_Telephone: 605-594-6148
Contact_Electronic_Mail_Address: daniels@usgs.gov
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any conclusions drawn from the analysis of this information are not the responsibility of the U.S. Geological Survey nor any of the partners.
Metadata_Reference_Information:
Metadata_Date: 20120615
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Metadata Specialist
Contact_Address:
Address_Type: unknown
Address: 600 4th Street S
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: US
Contact_Voice_Telephone: 727-803-8747
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Security_Information:
Metadata_Security_Classification: Unclassified
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Geographic:
Latitude_Resolution: 3.08641975308642e-4
Longitude_Resolution: 3.08641975308642e-4
Geographic_Coordinate_Units: Decimal degrees
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.000031
Ordinate_Resolution: 0.000031
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 1.00
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Depth_System_Definition:
Depth_Datum_Name: Land survey datum
Depth_Resolution: 1.00
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
Generated by mp version 2.9.6 on Thu Sep 13 09:04:43 2012