Metadata: Identification_Information: Citation: Citation_Information Originator: Florence L. Wong Originator: A.J. Stevenson Originator: Peter Dartnell Publication_Date: 2002 Title: BATHYGRD -- 5-m bathymetric grid of Glacier Bay Edition: Version 2.0, January 14, 2003 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: USGS Open-File Report Issue_Identification: 03-391 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Online_Linkage: Description: Abstract: This data set consists of bathymetric data of Glacier Bay, Alaska. The data are published as ESRI GRID format where interpolations have been calculated across nodata gaps that were no more than 30 meters wide. Data were collected during May 29 - June 6, 2001, by contract with Thales Geosolutions (http://www.thales-geopacific.com/) aboard the R/V Davidson as part of a cooperative survey conducted by the U.S. National Park Service and the U.S. Geological Survey (Biological Resources and Coastal and Marine Geology). The instrument was a Reson 8111 multibeam echosounder (http://reson.com/sb8111.htm). The raw data were reduced by Thales. Purpose: These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information. Supplemental_Information: Additional information about the field activities from which this data set was derived are available online at http://walrus.wr.usgs.gov/infobank/d/d101gb/html/d-1-01-gb.meta.html Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Specifications for the Reson SeaBat 8111 Multibeam Echosounder (http://www.reson.com/sb8111.htm) > Operating frequency: 100 kHz > Number of beams: 101 > Beamwidth across track: 1.5 degrees > Beamwidth along track: 1.5 degrees > Center-to-center beam separation: 1.5 degrees > Pulse length: Variable, operator selectable > Depth range: 3 - 1000 meters > Transducer depth rating: 100 meters > Max. update rate: 35 swaths per second > Max. vessel Speed: 20 knots > Stabilization: Pitch stabilization within 10 degrees > Projector beam control: External pitch sensor > Hydrophone size (Dia./arc/length): 640mm, 220 degrees, 200mm > Processor Dimensions (HWD): 177 x 483 x 434 mm > Tranceiver Dimensions (HWD): 267 x 450 x 427 mm > Weight: (with 15m cable): > Hydrophone Dry: 42 kg Wet: 36 kg > Projector Dry: 30 kg Wet: 23 kg > Transceiver weight: 13.6 kg > Processor weight: 20 kg Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Currentness_Reference: Ground Condition Status: Progress: In work Maintenance_and_Update_Frequency: As Needed. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -136.40302985 East_Bounding_Coordinate: -135.91123967 North_Bounding_Coordinate: 58.75738012 South_Bounding_Coordinate: 58.3490942 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: bathymetry Theme_Keyword: multibeam Theme_Keyword: echosounder Place: Place_Keyword_Thesaurus: None Place_Keyword: Glacier Bay Place_Keyword: Alaska Access_Constraints: None Use_Constraints: Data not to be used for navigational purposes. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Florence L. Wong Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Position: Geologist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5327 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: fwong@usgs.gov Native_Data_Set_Environment: SunOS, 5.7, sun4u UNIX ArcInfo version 8.0.2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Not applicable. Logical_Consistency_Report: Not applicable for raster data. Completeness_Report: Data values are missing in and around shallow or emergent features (islands) and where adjoining trackline coverage was not overlapping. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Navigation was multiple DGPS [differential global positioning systems] coupled up with 2 very precise DR [dead-reckoning] 3-axis accelerometers, all integrated in WinFrog (proprietary software from Thales Geosolutions http://www.thales-geopacific.com/offshore/index.html). The best functional test we did was crossties, which suggested that average navigational errors were on the order of 1 meter, with (rare) maximum errors being about 3 meters. (A.J. Stevenson, written communtication, October 2001) Lineage: Process_Step: Process_Description: Raw data processed by contractor Thales Geosolutions and provided as 10-m and 5-m xyz values in UTM 8 coordinate system. Process_Date: 2001 Process_Step: Process_Description: F.L. Wong converted xyz to ArcInfo grids. Data were processed in 50,000-point blocks. Each block of points was used to GENERATE a point coverage. Point coverages were converted to grids with the POINTGRID function and and merged into one continuous grid for GLACIER10MG and GLACIER05MG. For the interpolated grid GLACIER05MIG, the point coverage for each block was merged with adjoining blocks, the grid IDW function was applied with default options, and the resulting grid clipped to the boundary of the block. All the interpolated grids were merged into a continuous grid GLACIER05MIG that was corrected by a mask that omitted data in holes that exceede 30 meters in width. The masking grid was constructed as follows: a unit grid (data cells = 1, all others = nodata) was copied from GLACIER05MG. The unit grid was converted to a polygon coverage from which polygons with areas of less than 1000 square meters were removed in bulk. The remaining interior polygons were inspected in Arcedit and removed if the width were about 30 meters or less. This polygon coverage was converted back to a grid to be applied as a mask to the merged grids described in the previous paragraph. Process_Date: 2001 Process_Step: Process_Description: First draft of metadata created by curator using FGDCMETA.AML ver. 1.35 08/02/2000 on ArcInfo data set /arcdata/bathymetry/glacier10mg Process_Date: 20011018 Process_Step: Process_Description: Peter Dartnell copied the interpolated grid GLACIER05MIG and added the southernmost part of the data to a new grid named BATHYGRD for publication in U.S. Geological Survey Open-File Report OF02-391. Process_Date: 20030105 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 8995 Column_Count: 5566 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator UTM_Zone_Number: 8 Transverse_Mercator Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -135.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 5.0 Ordinate_Resolution: 5.0 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: GRS1980 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Values of the grids are elevation in meters. > MIN MAX MEAN STDV >bathygrd -412.997 -10.196 -131.044 85.165 Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Person: Florence L. Wong Contact_Position: Geologist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5327 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: fwong@usgs.gov Distribution_Liability: Please recognize the U.S. Geological Survey (USGS) as the source of this information. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Metadata_Reference_Information: Metadata_Date: 20030114 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Person: Florence L. Wong Contact_Position: Geologist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5327 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: fwong@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none