ArcInfo GRID format of the 2004 Multibeam Bathymetry Data in the Northeastern Channel Islands Region, Southern California [bathy.zip]

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?
   Dartnell, Peter, Cochrane, Guy, and Dunaway, Mary Elaine, 2005, ArcInfo GRID format of the 2004 Multibeam Bathymetry Data in the Northeastern Channel Islands Region, Southern California [bathy.zip]: U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA.

   Online Links:

   • http://pubs.usgs.gov/of/2005/1153/ci-data.html
   • http://pubs.usgs.gov/of/2005/1153/data/bathy.zip

   This is part of the following larger work.
   Dartnell, Peter, Cochrane, Guy, and Dunaway, Mary Elaine, 2005, Multibeam Bathymetry and Backscatter Data: Northeastern Channel Islands Region, Southern California: Open-File Report 2005-1153, U.S. Geological Survey, Reston, VA.

   Online Links:

   • http://pubs.usgs.gov/of/2005/1153/ci-index.html

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -119.72

   East_Bounding_Coordinate: -119.03

   North_Bounding_Coordinate: 34.33

   South_Bounding_Coordinate: 33.88

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 06-Aug-2004

   Ending_Date: 15-Aug-2004

   Currentness_Reference: ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: ArcInfo GRID

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions, type Grid Cell

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 11

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -117.00000

      Latitude_of_Projection_Origin: 0.00000

      False_Easting: 0.00

      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 15.0
      Ordinates (y-coordinates) are specified to the nearest 15.0
      Planar coordinates are specified in Meters

      The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/0.003352811.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   BATHYG is an ArcInfo GRID with the following attributes: Cell Size = 15.000 Data Type: Floating Point Number of Rows = 3170 Number of Columns = 3947
   BOUNDARY Xmin = 251265.440 Xmax = 310470.440 Ymin = 3753230.050 Ymax = 3800780.050
   STATISTICS Minimum Value = -1246.183 Maximum Value = -25.657 Mean = -328.334 Standard Deviation = 233.866 Depths corrected for tides to mean lower low water using a predictive tide model.
   
   
   

   Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Peter Dartnell
   • Guy Cochrane
   • Mary Elaine Dunaway

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   Peter Dartnell

   U.S. Geological Survey, Coastal and Marine Geology Program

   Physical Scientist

   USGS, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7415 (voice)

   (831) 427-4748 (FAX)

   pdartnell@usgs.gov

Why was the data set created?

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 data of the Northeastern Channel Islands, CA Region.

How was the data set created?

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   Date: 30-Nov-2004 (process 1 of 1)

   The multibeam bathymetry and acoustic backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam sonar system. The data are cleaned of bad navigation and depth readings and corrected for tides to mean lower low water datum using a predictive tide model. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command.
   

   Person who carried out this activity:
   

   Peter Dartnell

   U.S. Geological Survey, Coastal and Marine Geology Program

   Physical Scientist

   USGS, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7415 (voice)

   (831) 427-4748 (FAX)

   pdartnell@usgs.gov

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

   Not applicable for raster data.

2. How accurate are the geographic locations?

   0.5 meters

3. How accurate are the heights or depths?

   0.05 percent of the water depth. Depths corrected to mean lower low water datum.

4. Where are the gaps in the data? What is missing?

   Complete

5. How consistent are the relationships among the observations, including topology?

   Unspecified

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

This information is not intended for navigational purposes.

Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.

Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.

This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

1. Who distributes the data set? (Distributor 1 of 1)
   U.S. Geological Survey, Coastal and Marine Geology Program

   Attn: Peter Dartnell

   >

   USGS, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7415 (voice)
2. What's the catalog number I need to order this data set?

   USGS Open-File Report 2005-1153 Bathymetry Data ESRI ArcInfo GRID [bathy.zip]

3. What legal disclaimers am I supposed to read?

   
   This information is not intended for navigational purposes.
   
   This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
   
   Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
   
   
   

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	ArcInfo GRID (version 8.0.2) Size: 16.0
     Network links:	http://pubs.usgs.gov/of/2005/1153/data/bathy.zip

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 12-Sep-2014

Metadata author:

Peter Dartnell

U.S. Geological Survey, Coastal and Marine Geology Program

Physical Scientist

USGS, 400 Natural Bridges Drive

Santa Cruz, CA

USA

(831) 460-7415 (voice)

(831) 427-4748 (FAX)

pdartnell@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)