POTO_AREA: ESRI Format Binary Grid of the Merged Bathymetry and Elevation Data from the Potomac River/Chesapeake Bay Area For Use With USGS Cruise 06018

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Publication_Date: 2010
Title:
POTO_AREA: ESRI Format Binary Grid of the Merged Bathymetry and Elevation Data from the Potomac River/Chesapeake Bay Area For Use With USGS Cruise 06018
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1151
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<https://pubs.usgs.gov/of/2009/1151/data/basemap/elevation/poto_area.zip>
Online_Linkage: <https://pubs.usgs.gov/of/2009/1151/html/catalog.html>
Larger_Work_Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Originator: David S. Foster
Originator: John F. Bratton
Publication_Date: 2010
Title:
Continuous Resistivity Profiling and Seismic-Reflection Data Collected in 2006 from the Potomac River Estuary, Virginia and Maryland
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1151
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <https://pubs.usgs.gov/of/2009/1151/>
Description:
Abstract:
In order to test hypotheses about groundwater flow under and into Chesapeake Bay, geophysical surveys were conducted by U.S. Geological Survey (USGS) scientists on Chesapeake Bay and the Potomac River Estuary in September 2006. Chesapeake Bay resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge, which are contributing to eutrophication. The USGS has performed many related studies in recent years to provide managers with information necessary to make informed decisions about this issue. The research carried out as part of the study described here was designed to help refine nutrient budgets for Chesapeake Bay by characterizing submarine groundwater flow and discharge of groundwater beneath part of the mainstem and a major tributary, the Potomac River Estuary.
Purpose:
The purpose of this dataset is to provide a seamless elevation/bathymetry grid as a basemap layer for the work in the Potomac River area.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 1998
Single_Date/Time:
Calendar_Date: 1999
Currentness_Reference: Publication data of the original source datasets
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.387222
East_Bounding_Coordinate: -75.604370
North_Bounding_Coordinate: 38.729651
South_Bounding_Coordinate: 37.706801
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Info Bank ID K-1-06-CH
Theme_Keyword: bathymetry
Theme_Keyword: NOAA's Ocean Service, Special Projects
Theme_Keyword: hydrographic survey
Theme_Keyword: estuary
Theme_Keyword: estuarine bathymetry
Theme_Keyword: elevation
Theme_Keyword: digital elevation model
Theme_Keyword: DEM
Theme_Keyword: raster
Theme_Keyword: National Elevation Dataset
Theme_Keyword: NED
Theme_Keyword: ESRI binary grid
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Theme_Keyword: oceans
Theme_Keyword: oceans and estuaries
Theme_Keyword: oceans and coastal
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: North America
Place_Keyword: North Atlantic
Place_Keyword: United States
Place_Keyword: Virginia
Place_Keyword: Potomac River Estuary
Place_Keyword: Chesapeake Bay
Place_Keyword: Maryland
Access_Constraints: None.
Use_Constraints:
The public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey and the National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS) as the originators of the individual datasets. These data are not to be used for navigation.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: Woods Hole Coastal and Marine Science Center
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<https://pubs.usgs.gov/of/2009/1151/data/basemap/elevation/poto_area.gif>
Browse_Graphic_File_Description:
Thumbnail image of the color coded relief in the Potomac River Estuary area.
Browse_Graphic_File_Type: GIF
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500
Cross_Reference:
Citation_Information:
Originator:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP)
Publication_Date: 1998
Title:
Chesapeake Bay, VA/MD (M130) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: NOAA's Ocean Service, Special Projects (SP)
Online_Linkage: <http://estuarinebathymetry.noaa.gov/>
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey (USGS), EROS Data Center
Publication_Date: 1999
Title: National Elevation Dataset
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: U.S. Geological Survey
Online_Linkage: <http://ned.usgs.gov/>
Online_Linkage: <http://seamless.usgs.gov/>
Data_Quality_Information:
Completeness_Report:
This dataset represent complete elevation information for the area of interest.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
This grid is a combination of two dataset that provide the best-available data for the land elevations and the bathymetry of Chesapeake Bay. The 7.5-minute elevation data for the conterminous United States are the primary initial source data for the land elevation and were acquired from the National Elevation Dataset (NED). The bathymetry dataset was acquired from the NOAA estuarine bathymetry website. This dataset was derived from two hundred ninety-seven surveys dating from 1850 to 1993. The NED website does not specify any value for horizontal accuracy. According to the metadata accompanying the bathymetry dataset, the horizontal accuracy is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based upon horizontal accuracy tests of the source soundings used to generate the DEM. As a first approximation the locational accuracy of the source soundings are 0.0015 m at source "Smooth Sheet" scale (120 m @ 1:80,000 to 15 m @ 1:10,000). Smooth Sheets are maps generated as a principle product of each (historic) hydrographic survey with fully corrected soundings plotted on them. In both cases the user needs to refer to the original datasets to establish the details of the data and their estimates of accuracy.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The metadata accompanying the NED dataset does not specify a vertical accuracy. However, the website indicates the vertical accuracy of the National Elevation Dataset (NED) varies spatially because of the variable quality of the source digital elevation models (DEMs). As such, the NED inherits the accuracy of the source DEMs. The most recently published figure of overall absolute vertical accuracy expressed as the root mean square error (RMSE) is 2.44 meters. The estuarine bathymetry metadata indicates the vertical RMSE statistic is used to describe the vertical accuracy of a DEM. It encompasses both random and systematic errors introduced during production of the data. The RMSE is encoded in element number 5 of record C of the DEM. This accuracy estimate includes components related to quantization of the source soundings (1.3 to 0.15 m), the systematic editing of the source data (1percentor 0.10m), un-sampled bathymetric features (estimated at less than 5percentof depth), time related changes (erosion, deposition, and seismic shifts), and dredging operations (cut and fill). It is estimated that the accuracy of the Bathymetric DEMs is 2 percent of depth or 1 meter for depths grater than 20 meters and 2 percentof depth or 0.20 meters for depths shallower than 20 meters. THESE DEMs SHOULD NOT BE USED FOR NAVIGATION. The two datasets used to create this merged product are referenced to different vertical datums. The NED data use a vertical datum of NAVD88 while the estuarine data simply specifies the vertical datum as referenced to the local tidal datum at the time of the hydrographic survey. No adjustment was made to the individual datasets to attempt to eliminate this discrepancy. The user needs to refer to the original datasets to establish the details of the data and their estimates of accuracy.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey (USGS), EROS Data Center
Publication_Date: 1999
Title: National Elevation Dataset
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: U.S. Geological Survey
Online_Linkage: <http://ned.usgs.gov/>
Online_Linkage: <http://seamless.usgs.gov/>
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NED
Source_Contribution: Land elevation values.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP)
Publication_Date: 1998
Title:
Chesapeake Bay, VA/MD (M130) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: NOAA's Ocean Service, Special Projects (SP)
Online_Linkage: <http://estuarinebathymetry.noaa.gov/>
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: EstuaryBathy
Source_Contribution: Bathymetry values.
Process_Step:
Process_Description:
In generating a grid for the area of interest, this required four files to be downloaded from the National Elevation Dataset (NED) site (<http://ned.usgs.gov/> or <http://seamless.usgs.gov/>). The downloaded files were each accompanied by metadata that indicates the publication date of the data as 1999. These original grids are in a geographic coordinate system, NAD83, with a vertical datum of NAVD88. The cell size of these grids is 0.000278 decimal degrees. These files cover the land portion of the area of interest. The cell values where water occurs is usually set to 0 - not true elevation (bathymetry) values. This process step, as well as all subsequent process steps were performed by the same individual - VeeAnn A. Cross.
Process_Date: 2006
Source_Produced_Citation_Abbreviation: ned_47818044
Source_Produced_Citation_Abbreviation: ned_52341366
Source_Produced_Citation_Abbreviation: ned_77859792
Source_Produced_Citation_Abbreviation: ned_84386099
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: Woods Hole Coastal and Marine Science Center
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Using ArcMap 9.0, Spatial Analyst - Spatial Analyst Toolbar - Raster Calculator I merged all four of these grids together. The raster calculator command was: merge([ned_47818044], [ned_52341366], [ned_77859792], [ned_84386099]). This adds a temporary grid to the ArcMap table of contents. Right mouse click on the layer - Data - Make Permanent to convert the temporary grid to a permanent grid - merge4.
Source_Used_Citation_Abbreviation: ned_47818044
Source_Used_Citation_Abbreviation: ned_52341366
Source_Used_Citation_Abbreviation: ned_77859792
Source_Used_Citation_Abbreviation: ned_84386099
Process_Date: 2006
Source_Produced_Citation_Abbreviation: merge4
Process_Step:
Process_Description:
ArcMap 9.0 - ArcToolbox - Data Management Tools - Projections and Transformations - Raster - Project Raster to project the original geographic grid to UTM, Zone 18, NAD83 using the bilinear interpolation. Because both the input and output grids are NAD83, no datum transformation was necessary. All other parameters were left to their default.
Source_Used_Citation_Abbreviation: merge4
Process_Date: 2006
Source_Produced_Citation_Abbreviation: merge4_utm
Process_Step:
Process_Description:
For the bathymetry portion of the area of interest, the Estuarine Bathymetry project of NOAA provided the data - <http://estuarinebathymetry.noaa.gov/>. To cover the whole Chesapeake Bay area, three data files were downloaded: M130_37076C5_BIG1.dem, M130_38076D4_BIG2.dem, and M130_39076C2_BIG3.dem. These files were accompanied by metadata indicating the publication date for these data as 1998. In addition, a complete explanation of their processing history is included. The original projection of the data is UTM, zone 18, NAD27 with a cell size of 30 meters. The vertical datum for the bathymetry is referenced to local tidal datum at the time of the hydrographic surveys that make up the dataset. The vertical unit is meters.
Process_Date: 2006
Source_Produced_Citation_Abbreviation: M130_37076C5_BIG1.dem
Source_Produced_Citation_Abbreviation: M130_38076D4_BIG2.dem
Source_Produced_Citation_Abbreviation: M130_39076C2_BIG3.dem
Process_Step:
Process_Description:
The Digital Elevation Model (DEM) estuarine files needed to be converted from the USGS DEM format to ESRI grid format. To do that, ArcMap 9.0 - ArcToolbox - Conversion Tools - To Raster - DEM to Raster. The output data type is float, with the Z-factor left to the default value of 1.
Source_Used_Citation_Abbreviation: M130_37076C5_BIG1.dem
Source_Used_Citation_Abbreviation: M130_38076D4_BIG2.dem
Source_Used_Citation_Abbreviation: M130_39076C2_BIG3.dem
Process_Date: 2006
Source_Produced_Citation_Abbreviation: big1
Source_Produced_Citation_Abbreviation: big2
Source_Produced_Citation_Abbreviation: big3
Process_Step:
Process_Description:
These grids then needed to be projected to UTM, Zone 18, NAD83 - basically just a datum transformation. To do this, ArcMap 9.0 - Data Management Tools - Projections and Transformations - Raster - Project Raster. The geographic transformation used was NAD_1927_to NAD_1980_NADCON. The resampling method was bilinear.
Source_Used_Citation_Abbreviation: big1
Source_Used_Citation_Abbreviation: big2
Source_Used_Citation_Abbreviation: big3
Process_Date: 2006
Source_Produced_Citation_Abbreviation: big1_nad83
Source_Produced_Citation_Abbreviation: big2_nad83
Source_Produced_Citation_Abbreviation: big3_nad83
Process_Step:
Process_Description:
To combine the land and the bathymetry used ArcMap 9.0 - Spatial Analyst Toolbar - Raster Calculator. Using the Merge command within raster calculator: merge(big1_nad83, big2_nad83, big3_nad83, merge4_utm). The order of the file inputs is important, as the last raster listed has the lowest priority. In this case, the land grid (merge4_utm) needed to be last so that the true bathymetry values overwrote the zero values of the water areas in the land grid. The result of this merge command generated a temporary grid in the ArcMap table of contents.
Source_Used_Citation_Abbreviation: big1_nad83
Source_Used_Citation_Abbreviation: big2_nad83
Source_Used_Citation_Abbreviation: big3_nad83
Source_Used_Citation_Abbreviation: merge4_utm
Process_Date: 2006
Source_Produced_Citation_Abbreviation: temporary grid
Process_Step:
Process_Description:
A graphic polygon was drawn indicating the area of interest. VACExtras 1.95 (a Woods Hole extension to ArcMap) was then used to clip the temporary merged grid with the polygon graphic using Clip Grid with Graphic. This in turn created a temporary grid that was then converted to a permanent file by right-clicking on the layer in the table of contents - Data - Make Permanent.
Source_Used_Citation_Abbreviation: temporary grid
Process_Date: 2006
Source_Produced_Citation_Abbreviation: poto_area
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 3702
Column_Count: 5144
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 30.000000
Ordinate_Resolution: 30.000000
Planar_Distance_Units: meters
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
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Depth_System_Definition:
Depth_Datum_Name:
referenced to local tidal datum at the time of the hydrographic survey
Depth_Resolution: 1
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: Woods Hole Coastal and Marine Science Center
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
Neither the U.S. government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: WinZip
Format_Version_Number: 9.0
Format_Information_Content:
This WinZip file contains the ESRI binary grid and an ESRI lyr file that can be used to display the data in ArcMap. In addition, the WinZip file has the associated metadata files.
Transfer_Size: 60.7 MB
Digital_Transfer_Option:
Offline_Option:
Offline_Media: DVD
Recording_Capacity:
Recording_Density: 4.75
Recording_Density_Units: GBytes
Recording_Format: UDF
Fees: None.
Technical_Prerequisites:
This WinZip file contains data available in ESRI binary grid format. The user must have software capable of uncompressing the WinZip file and reading/displaying the raster data.
Metadata_Reference_Information:
Metadata_Date: 20100325
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: Woods Hole Coastal and Marine Science Center
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.6 on Thu Mar 25 13:04:17 2010