Maximum Historical Eelgrass Extent

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: Maximum Historical Eelgrass Extent

Abstract:

The maximum historical eelgrass extent is a combination of all known and accurate eelgrass surveys in the Bay that were conducted prior to the 2003 survey, and the 2003 survey.

Supplemental_Information: 2003 eelgrass survey results may also be available

1. How should this data set be cited?

   Caltrans, NOAA Fisheries, and Merkel & Associa, Unpublished Material, Maximum Historical Eelgrass Extent.

   Online Links:

   • \\server4\merkel\Projects\99\99-104-\99-104-12 Baywide Eelgrass\GIS\Maximum_historical_eelgrass.shp

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -122.514758

   East_Bounding_Coordinate: -122.133837

   North_Bounding_Coordinate: 38.010218

   South_Bounding_Coordinate: 37.556087

3. What does it look like?

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

   Calendar_Date: unknown

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: vector digital data

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):

      • G-polygon (1212)

   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: 0.999600

      Longitude_of_Central_Meridian: -123.000000

      Latitude_of_Projection_Origin: 0.000000

      False_Easting: 500000.000000

      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000128
      Ordinates (y-coordinates) are specified to the nearest 0.000128
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
      

7. How does the data set describe geographic features?

   Maximum Historical Eelgrass Extent

   Historical eelgrass coverage of SF Bay

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   ID

   SOURCETHM

   AREA

   PERIMETER

   ACRES

   VALUE

   SOURCE

   Citation for source of eelgrass data.

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Caltrans, NOAA Fisheries, and Merkel & Associates, Inc

2. Who also contributed to the data set?

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

   Merkel & Associates, Inc
   c/o Merkel & Associates, Inc
   GIS Department
   

   (858) 560-5465 (voice)
   (858) 560-7779 (FAX)
   associates@merkelinc.com
   

   Hours_of_Service: 8am-5pm M-F PST

Eelgrass coverage is in a constant state of flux and thus, understanding the potential eelgrass habitat areas in addition to the beds that were mapped during the 2003 survey is crucial for determining the maximum range of eelgrass within the Bay.

1. From what previous works were the data drawn?

   (source 1 of 1)

   , Merkel & Associates 2004. Baywide Eelgrass Inventory and Habitat Evaluation.

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

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

   , Merkel & Associates 2004. Baywide Eelgrass Inventory and Habitat Evaluation.

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 observations, including topology?

   This layer is a product of multiple data sources. There is feature overlap wherever eelgrass was mapped by multiple surveys. This overlap is intentionally maintained to display consistent eelgrass coverage.

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

Access_Constraints:

REQUIRED: Restrictions and legal prerequisites for accessing the data set. To be set by NOAA/Caltrans

Use_Constraints:

REQUIRED: Restrictions and legal prerequisites for using the data set after access is granted. To be set by NOAA/Caltrans

1. Who distributes the data set?[Distributor contact information not provided.]

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

   Downloadable Data

3. What legal disclaimers am I supposed to read?

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

     Data format:	Size: 1.440

   • Cost to order the data:

Dates:

Last modified: 10-Mar-2004

Metadata author:

REQUIRED: The organization responsible for the metadata information.
c/o REQUIRED: The person responsible for the metadata information.
REQUIRED: The city of the address., REQUIRED: The state or province of the address. REQUIRED: The ZIP or other postal code of the address.

REQUIRED: The telephone number by which individuals can speak to the organization or individual. (voice)

Metadata standard:

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

Metadata extensions used:

• <http://www.esri.com/metadata/esriprof80.html>