Identification_Information: Citation: Citation_Information: Originator: NOAA Coastal Services Center Publication_Date: 20000531 Title: Bathymetric Change Grid of Lower Bay, New York Edition: One Geospatial_Data_Presentation_Form: Map Publication_Information: Publication_Place: Charleston, South Carolina, USA Publisher: NOAA Coastal Services Center Other_Citation_Details: This data layer was created from the Geophysical Data System (GEODAS)data sets compiled by the National Geophysical Data Center (NGDC) from NOAA hydrographic surveys. Larger_Work_Citation: Citation_Information: Originator: NOAA Coastal Services Center Publication_Date: 20000531 Title: Sediment Profile Imaging for New York/New Jersey Harbor for October 1994 to October 1995 Publication_Information: Publication_Place: Charleston, South Carolina, USA Publisher: NOAA Coastal Services Center Online_Linkage: Description: Abstract: The Bathymetric Change Grid of Lower Bay, New York was created for use in the Sediment Profile Imaging for New York/New Jersey Harbor for October 1994 to October 1995 project. Hydrographic survey data were brought into Environmental Systems Research Institute (ESRI), Inc. ArcView geographic information system (GIS) software for visualization. Depth changes were calculated from bathymetric data gathered through the National Ocean Service hydrographic survey from Lower Bay, NY. Changes caused by natural and anthropogenic sources can be assessed through comparisons of historical and more recent information. Purpose: These data are critical for bathymetric change analysis in Lower Bay, NY. The data layer created from this dataset was used for spatial analysis in the Benthic Habitats of New York/New Jersey Harbor project to estimate changes in bathymetry as a result of natural processes as well as human-induced changes, such as dredging. Supplemental_Information: Grid creation involved mathematical interpolation of values for some cells in the data layer. These cell values were calculated from the measured values of the twelve nearest-neighbor cells. Therefore, this data layer represents an estimate of bathymetric change in Lower Bay, NY. It is the user's responsibility to determine the appropriate application of this data layer. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1934 Ending_Date: 1982 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -74.287050 East_Bounding_Coordinate: -73.880364 North_Bounding_Coordinate: 40.613228 South_Bounding_Coordinate: 40.391903 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: Boundaries Theme_Keyword: 003 Theme_Keyword: GeoscientificInformation Theme_Keyword: 008 Theme_Keyword: ImageryBaseMapsEarthCover Theme_Keyword: 010 Theme_Keyword: Inland Waters Theme_Keyword: 012 Theme_Keyword: Location Theme_Keyword: 013 Theme_Keyword: Oceans Theme_Keyword: 014 Theme_Keyword: PlanningCadastre Theme_Keyword: 015 Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Bathymetry Theme_Keyword: Bathymetric data Theme_Keyword: Depth Theme_Keyword: Geographic Information Systems Theme_Keyword: GIS Theme_Keyword: Grid Place: Place_Keyword_Thesaurus: None Place_Keyword: Lower Bay Place_Keyword: Raritan Bay Place_Keyword: Sandy Hook Bay Place_Keyword: New York Place_Keyword: New Jersey Place_Keyword: New York Harbor Place_Keyword: Northeast Access_Constraints: None Use_Constraints: It is the user's responsibility to determine the appropriate use of this data layer. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Position: Landscape Characterization and Restoration (LCR) Program Manager Contact_Address: Address_Type: mailing and physical address Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405 Country: USA Contact_Voice_Telephone: 843-740-1200 Contact_Facsimile_Telephone: 843-740-1224 Contact_Electronic_Mail_Address: csc@csc.noaa.gov Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time Native_Data_Set_Environment: ESRI Grid format r:\LCR\linda\ny_cd\gis\grids\changelb Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal tests were performed. The accuracy was tested by comparison of calculated depth values to knowledge of historical depths resulting from dredging activities. Logical_Consistency_Report: N/A Completeness_Report: These data are believed to be complete within the area of interest. All data available from 1934, 1979 and 1982 surveys that occurred within Lower Bay, NY were included in grid creation. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The data were retrieved from the GEODAS database with latitude/longitude coordinates in decimal degrees referenced to the North American Datum of 1927 (NAD 27). These data were then converted into North American Datum of 1983 (NAD 83) using ArcView's NADCON extension and projected into Universal Transverse Mercator (UTM) Zone 18 prior to grid creation. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The data were referenced to mean low water (MLW) or mean lower low water (MLLW) at the time of collection, depending on the survey. Therefore, there is a vertical offset on the order of one meter which should be considered by the user of these data. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: NOAA National Environmental Satellite, Data, and Information Service (NESDIS) Publication_Date: 199312 Title: Geophysical Data System (GEODAS) for Hydrographic Survey Data Edition: Volume 1, Version 3.2 Geospatial_Data_Presentation_Form: tabular digital data Publication_Information: Publication_Place: Boulder, Colorado Publisher: NOAA National Geophysical Data Centers (NGDC), Marine Geology and Geophysics Division Online_Linkage: Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1934 Ending_Date: 1934 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: NGDC Source_Contribution: The GEODAS CD-ROM contained the data and retrieval software needed to create this data layer. Process_Step: Process_Description: The data were retrieved from the CD-ROM using the default HYD93 download and tabulated with header information for the oldest and newest bathymetric data with the most comprehensive coverage of the area of interest. The tables were saved as DBF files and brought into ArcView as event themes. They were then converted from NAD 27 to NAD 83 using the NADCON extension and saved as shapefiles. The shapefiles were then projected into UTM Zone 18. Grid interpolation was performed using the Spatial Analyst extension and a mask grid, created from a polygon file of the water and shoreline, was used to produce grids of the oldest and newest bathymetry. This data layer was then created by subtracting the older depth values for each cell from the newer values using the Spatial Analyst extension. Source_Used_Citation_Abbreviation: NGDC Process_Date: 19990517 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Position: Landscape Characterization and Restoration Program (LCR) Program Manager Contact_Address: Address_Type: mailing and physical address Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405 Country: USA Contact_Voice_Telephone: 843-740-1200 Contact_Facsimile_Telephone: 843-740-1224 Contact_Electronic_Mail_Address: csc@csc.noaa.gov Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 477 Column_Count: 572 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: Longitude_Resolution: Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6,378,137 Denominator_of_Flattening_Ratio: 298.257 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ArcView Grid Entity_Type_Definition: raster grid produced by ArcView Spatial Analyst Entity_Type_Definition_Source: ESRI Overview_Description: Entity_and_Attribute_Overview: This data layer is a floating point grid, and therefore it does not have an attribute table or set of attributes. The cell value ranges are based on calculated depths in meters, and negative values represent elevation while positive values represent depth. Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Position: Clearinghouse Manager Contact_Address: Address_Type: mailing and physical address Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405 Country: USA Contact_Voice_Telephone: 843-740-1210 Contact_Facsimile_Telephone: 843-740-1224 Contact_Electronic_Mail_Address: csc@csc.noaa.gov Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time Resource_Description: Bathymetric Change Grid of Lower Bay, NY Distribution_Liability: While every effort has been made to ensure that these data are accurate and reliable within limits of the state of the art, NOAA will not assume any liability for damages caused by any inaccuracies in these data, or failure in their use. Custom_Order_Process: For information about obtaining these data, please visit the project home page at Metadata_Reference_Information: Metadata_Date: 20000412 Metadata_Review_Date: 20000522 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Position: Metadata Specialist Contact_Address: Address_Type: Mailing and physical address Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405 Country: USA Contact_Voice_Telephone: 843-740-1200 Contact_Facsimile_Telephone: 843-740-1224 Contact_Electronic_Mail_Address: csc@csc.noaa.gov Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: FGDC-STD-001-1998 Generated by mp version 2.2.4 on Mon May 22 14:35:00 2000