NAGEL86 - dredge samples from Ascension Canyon, central California

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?

Title:

NAGEL86 - dredge samples from Ascension Canyon, central California

Abstract:

NAGEL86 is a collection of sample dredge lines accompanied by descriptions of the rocks that were collected from Ascension Canyon near Monterey Bay, California.

This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program "Monterey Bay National Marine Sanctuary Project" <http://walrus.wr.usgs.gov/mbms>. The data were collected and analyzed between 1994 and 2000.

1. How should this data set be cited?

   Nagel, D.K., Mullins, H.T., Greene, H.G., Wong, Florence L. , and Lee, Wilson C. , 2001, NAGEL86 - dredge samples from Ascension Canyon, central California:.

   Online Links:

   • <http://geopubs.wr.usgs.gov/open-file/of01-179>

   This is part of the following larger work.

   Wong, F.L., and Eittreim, S.E., 2001, Continental Shelf GIS for the Monterey Bay National Marine Sanctuary: U.S. Geological Survey Open-File Report 01-179, U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • <http://geopubs.wr.usgs.gov/open-file/of01-179/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -122.47302831

   East_Bounding_Coordinate: -122.16662612

   North_Bounding_Coordinate: 36.99196534

   South_Bounding_Coordinate: 36.79842807

3. What does it look like?

   <http://geopubs.wr.usgs.gov/open-file/of01-179/images/splprev.gif> (GIF)

   location map of nagel86

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

   Calendar_Date: 1986

   Currentness_Reference: Ground Condition

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

   Geospatial_Data_Presentation_Form: map

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (19)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 10

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -123.00000

      Latitude_of_Projection_Origin: 0.00000

      False_Easting: 500000.00

      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 2.715008307171
      Ordinates (y-coordinates) are specified to the nearest 2.715008307171
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The items from arc attribute table NAGEL86.AAT are described below.

   DEPTH1_M     dredge start depth
   DEPTH2_M     dredge end depth
   LITHOLOGY1   lithology, age, formation/group of rock 1
   AGE1
   FORMATNGRP1
   LITHOLOGY2   lithology, age, formation/group of rock 2
   AGE2
   FORMATNGRP2
   LITHOLOGY3   lithology, age, formation/group of rock 3
   AGE3
   FORMATNGRP3
   F-LONG       longitude of start of dredge track
   F-LAT        latitude of start of dredge track
   T-LONG       longitude of end of dredge track
   T-LAT        latitude of end of dredge track
   ID           dredge id
   
   
   

   Entity_and_Attribute_Detail_Citation: none

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Nagel, D.K.
   • Mullins, H.T.
   • Greene, H.G.
   • Florence L. Wong
   • Wilson C. Lee

2. Who also contributed to the data set?

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

   Florence L. Wong
   United States Geological Survey (USGS)
   Geologist, GIS Coordinator
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5327 (voice)
   (650) 329-5190 (FAX)
   fwong@usgs.gov
   

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 about the shallower areas of the Monterey Bay National Marine Sanctuary.

1. From what previous works were the data drawn?

   Nagel and others (1986) (source 1 of 1)

   Nagel, D.K., Mullins, H.T., and Greene, H.G., 1986, Ascension Submarine Canyon, California--Evolution of a multi-head canyon system along a strike-slip continental margin: Marine Geology 73, 285-310.

   Type_of_Source_Media: paper

   Source_Contribution: dredge tracks from fig. 3; lithology from tbl. 1

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

   Date: 1999 (process 1 of 2)

   Wilson Lee scanned dredge tracks and built ArcInfo line coverage from Nagel and others (1986). Sample descriptions from same source transcribed into ASCII text file. Florence Wong added sample descriptions as attributes to line coverage.

   Date: 03-Apr-2001 (process 2 of 2)

   First draft of metadata created by F.L. Wong using a modified version of FGDCMETA.AML on ARC/INFO data set NAGEL86

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

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?

   Only shallower-water samples from the Nagel and others (1986) data set were digitized.

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

   Chain-node topology present.

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

Access_Constraints:

None

Use_Constraints:

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.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

1. Who distributes the data set? (Distributor 1 of 1)

   United States Geological Survey (USGS)
   c/o Florence L. Wong
   Geologist, GIS Coordinator
   USGS, MailStop 999, 345 Middlefield Road
   Menlo Park, CA 94025-3561
   USA
   

   (650) 329-5327 (voice)
   (650) 329-5190 (FAX)
   fwong@usgs.gov
   

2. What's the catalog number I need to order this data set?

   USGS Open-File Report 01-179

3. What legal disclaimers am I supposed to read?

   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.

   Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

   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.

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

     Data format:	dredge samples with attributes in format ArcInfo (version 8.0.2) Size: 0.01 megabytes
     Network links:	<http://geopubs.wr.usgs.gov/open-file/of01-179/>

   • Cost to order the data: none

Dates:

Last modified: 03-Apr-2001
Last Reviewed: May-2001

Metadata author:

United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA

(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)