NOAA Coastal Services Center 20000531 One Map Charleston, South Carolina, USA NOAA Coastal Services Center 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. NOAA Coastal Services Center 20000531 Charleston, South Carolina, USA NOAA Coastal Services Center <http://www3.csc.noaa.gov/dbapps/irtscapture/BouncePage.asp?Bounce2=ftp://www.csc.noaa.gov/pub/lcr/nyharbor/jb34bath.zip&product=227> The 1934 Bathymetry Grid of Jamaica 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, Inc. (ESRI) ArcView geographic information system (GIS) software for visualization. These data represent the oldest bathymetric information gathered through the National Ocean Service hydrographic survey from Jamaica Bay, NY and provide extensive coverage of the area. Depth changes caused by natural and anthropogenic sources can be assessed through comparisons of this historical dataset to more recent information. These data are critical for bathymetric change analysis in Jamaica 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. 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 the actual bathymetry of Jamaica Bay, NY in 1934. It is the user's responsibility to determine the appropriate application of this data layer. 1934 1934 ground condition Complete None planned -74.0156 -73.7384 40.6638 40.5350 ISO 19115 Topic Category Boundaries 003 GeoscientificInformation 008 ImageryBaseMapsEarthCover 010 Inland Waters 012 Location 013 Oceans 014 PlanningCadastre 015 None Bathymetry Bathymetric data Depth Geographic Information Systems GIS Grid None Jamaica Bay New York New York Harbor Northeast None It is the user's responsibility to determine the appropriate use of this data layer. NOAA Coastal Services Center Landscape Characterization and Restoration (LCR) Program Manager mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 USA 843-740-1200 843-740-1224 csc@csc.noaa.gov Monday-Friday, 8am-5pm, Eastern Standard Time ESRI Grid format r:\LCR\linda\ny_cd\gis\grids\jb34bath No formal tests were performed. The accuracy was tested by comparison of calculated depth values to knowledge of historical depths resulting from dredging activities. N/A These data are believed to be complete within the area of interest. All data available from 1934 surveys that occurred within Jamaica Bay, NY and extended westward past Rockaway Point were included in grid creation. 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. The data were referenced to mean lower low water (MLLW) at the time of collection. NOAA National Environmental Satellite, Data, and Information Service (NESDIS) 199312 Volume 1, Version 3.2 tabular digital data Boulder, Colorado NOAA National Geophysical Data Centers (NGDC), Marine Geology and Geophysics Division <http://www.ngdc.noaa.gov/mgg/> database 1934 1934 ground condition NGDC The GEODAS CD-ROM contained the data and retrieval software needed to create this data layer. The data were retrieved from the CD-ROM using the default HYD93 download and tabulated with header information. The table was saved as a DBF file and brought into ArcView as an event theme. It was then converted from NAD 27 to NAD 83 using the NADCON extension and saved as a shapefile. The shapefile was then projected into UTM Zone 18. Grid interpolation was then performed using the Spatial Analyst extension with a mask grid created from a polygon file of the water and shoreline. NGDC 19990517 NOAA Coastal Services Center Landscape Characterization and Restoration Program (LCR) Program Manager mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 USA 843-740-1200 843-740-1224 csc@csc.noaa.gov Monday-Friday, 8am-5pm, Eastern Standard Time Raster Grid Cell 560 931 Decimal Degrees North American Datum of 1983 Geodetic Reference System 80 6,378,137 298.257 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. NOAA Coastal Services Center Clearinghouse Manager mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 USA 843-740-1210 843-740-1224 csc@csc.noaa.gov Monday-Friday, 8am-5pm, Eastern Standard Time 1934 Bathymetry Grid of Jamaica Bay, NY 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. For information about obtaining these data, please visit the project home page at <http://www3.csc.noaa.gov/dbapps/irtscapture/BouncePage.asp?Bounce2=ftp://www.csc.noaa.gov/pub/lcr/nyharbor/jb34bath.zip&product=227> 20000412 20000522 NOAA Coastal Services Center Metadata Specialist Mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 USA 843-740-1200 843-740-1224 csc@csc.noaa.gov Monday-Friday, 8am-5pm, Eastern Standard Time FGDC CSDGM FGDC-STD-001-1998 Generated by mp version 2.2.4 on Mon May 22 14:35:01 2000