Identification_Information: Citation: Citation_Information: Originator: United States Geological Survey (USGS), Coastal and Marine Geology (CMG), Chief Scientist (James V. Gardner) Publication_Date: 2002 Title: Multibeam Mapping of the Mid and Outer Shelf, Head of De Soto Canyon, Northeastern Gulf of Mexico Geospatial_Data_Presentation_Form: ArcInfo GRID Description: Abstract: ArcInfo GRID format data generated from the 2002 multibeam sonar survey, field activity M-1-02-GM, of the head of De Soto Canyon, Northeastern Gulf of Mexico. The data include high-resolution bathymetry and calibrated acoustic backscatter. 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) or other software to display bathymetry and backscatter data of the head of De Soto Canyon, Northeastern Gulf of Mexico. Supplemental_Information: Information about USGS Coastal and Marine Geology field activity M-1-02-GM are online at Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20020617 Ending_Date: 20020709 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -87.58 East_Bounding_Coordinate: -86.50 North_Bounding_Coordinate: 30.16 South_Bounding_Coordinate: 29.50 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Marine Geology Theme_Keyword: Multibeam Theme_Keyword: Bathymetry Theme_Keyword: Backscatter Theme_Keyword: Water Depth Theme_Keyword: Ocean Floor Topography Theme_Keyword: Deep-water Reefs Place: Place_Keyword_Thesaurus: None Place_Keyword: Northeastern Gulf of Mexico Place_Keyword: FL Place_Keyword: Florida Place_Keyword: De Soto Canyon Place_Keyword: Gulf of Mexico Place_Keyword: USA Access_Constraints:None Use_Constraints: Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: James V. Gardner Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Position: Geologist 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) 329-5469 Contact_Facsimile_Telephone: (650) 329-5411 Contact_Electronic_Mail_Address: jvgardner@usgs.gov Cross_Reference: Citation_Information: Originator: United States Geological Survey (USGS), Coastal and Marine Geology (CMG) Publication_Date: 20020917 Title: USGS CMG M-1-02-GM Metadata Online_Linkage: http://walrus.wr.usgs.gov/infobank/m/m102gm/html/m-1-02-gm.meta.html Larger_Work_Citation: Citation_Information: Originator: United States Geological Survey (USGS), Coastal and Marine Geology (CMG) Publication_Date: 20020917 Title: USGS CMG InfoBank Online_Linkage: http://walrus.wr.usgs.gov/infobank/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Not applicable for raster data. Logical_Consistency_Report: Unspecified Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 50 centimeters Vertical_Positional_Accuracy Vertical_Positional_Accuracy_Report: Not applicable Lineage: Process_Step: Process_Description: The bathymetry and backscatter data were collected along a continuous swath perpendicular to the direction of the ship using Kongsberg Simrad EM1000 and EM3000D multibeam sonar systems. The data are cleaned of bad navigation and depth readings. Backscatter readings were converted from dB (decibels) to DN (digital number) using the convertion, ABSOLUTE VALUE(2DN/dB), where DN: 0-255 and dB: 0 - -127. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command. Process_Date: 20020830 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: James V. Gardner Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Position: Geologist 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) 329-5469 Contact_Facsimile_Telephone: (650) 329-5411 Contact_Electronic_Mail_Address: jvgardner@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -87.00000 Latitude_of_Projection_Origin: 0.00000 False_Easting: 0.00 False_Northing: 0.00 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 8.0 Ordinate_Resolution: 8.0 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: WGS84 Ellipsoid_Name: WGS84 Semi-major_Axis: 6378137.00 meters Denominator_of_Flattening_Ratio: 0.003352811 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: Mean lower low water Depth_Resolution: 0.5% of the water depth (Simrad EM1000). 5 centimeters (Simrad EM3000). Depth_Distance_Units: meters Depth_Encoding_Method: Implicit coordinate Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: NTHBATHG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 2848 Number of Columns = 3155 BOUNDARY Xmin = 514471.079 Xmax = 539711.079 Ymin = 3311737.928 Ymax = 3334521.928 STATISTICS Minimum Value = -107.178 Maximum Value = -39.811 Mean = -73.520 Standard Deviation = 16.604 NTHMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 2370 Number of Columns = 3163 BOUNDARY Xmin = 514447.343 Xmax = 539751.343 Ymin = 3315561.286 Ymax = 3334521.286 STATISTICS Minimum Value = 27.000 Maximum Value = 224.344 Mean = 188.365 Standard Deviation = 7.004 CENBATHG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5391 Number of Columns = 5804 BOUNDARY Xmin = 471227.542 Xmax = 517659.542 Ymin = 3291574.324 Ymax = 3334702.324 STATISTICS Minimum Value = -146.640 Maximum Value = -38.600 Mean = -80.610 Standard Deviation = 22.121 CENMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5410 Number of Columns = 5804 BOUNDARY Xmin = 471227.215 Xmax = 517659.215 Ymin = 3291447.342 Ymax = 3334727.342 STATISTICS Minimum Value = 18.000 Maximum Value = 235.553 Mean = 193.388 Standard Deviation = 8.921 STHBATHG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5628 Number of Columns = 3926 BOUNDARY Xmin = 445545.785 Xmax = 476953.785 Ymin = 3264439.695 Ymax = 3309463.695 STATISTICS Minimum Value = -245.510 Maximum Value = -35.610 Mean = -80.211 Standard Deviation = 33.998 STHMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5628 Number of Columns = 3990 BOUNDARY Xmin = 445038.094 Xmax = 476958.094 Ymin = 3264439.640 Ymax = 3309463.640 STATISTICS Minimum Value = 19.001 Maximum Value = 241.236 Mean = 196.344 Standard Deviation = 6.142 Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: United States Geological Survey (USGS) Information Services Contact_Address: Address_Type: mailing and physical address Address: Box 25286 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (888)ASK-USGS Resource_Description: U.S. Geological Survey Open-file Report 02-XXX Distribution_Liability These data not intended for navigational purposes. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, 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 data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ArcInfo GRID Format_Version_Number: 8.0.2 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: None Metadata_Reference_Information: Metadata_Date: 20020827 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Pete Dartnell Contact_Organization: United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Contact_Position: Physical Scientist 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) 329-5460 Contact_Facsimile_Telephone: (650) 329-5411 Contact_Electronic_Mail_Address: pdartnell@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: universal time