grzpca - BLM California Range Allotments

Frequently-asked questions:


What does this data set describe?

Title:
grzpca - BLM California Range Allotments

Abstract:
BLM grazing allotments in California.

Supplemental information:
None.

  1. How should this data set be cited?

    U.S. Bureau of Land Management, (yyyymmdd [pub/release date] or Unpublished), grzpca - BLM California Range Allotments : U.S. Bureau of Land Management, California State Office, Sacramento, CA.

    Online links:
  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -154.418702
    East: -80.332273
    North: 59.650183
    South: 21.235537

  3. What does it look like?

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

    Calendar date: 20030218
    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):
      • String (8256)
      • G-polygon (1574)
      • G-polygon (712)
      • Node, planar graph (7268)
      • Point (4)
      • Composite object (700)
      • Composite object (128)

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

      The map projection used is Transverse Mercator.

      Projection parameters:
      Scale factor at central meridian: 0.999400
      Longitude of central meridian: -119.000000
      Latitude of projection origin: 37.000000
      False easting: 500000.000000
      False northing: 1500000.000000

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.000151.
      Ordinates (y-coordinates) are specified to the nearest 0.000151.
      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.

      Vertical coordinate system definition:
      Altitude system definition:
      Altitude resolution: 0.000003
      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    casodev:caso.RA_Arcs
    casodev:caso.RA_Pastures
    casodev:caso.RA_Allotments
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Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)


  2. Who also contributed to the data set?

    These data developed and maintained by the U.S. Bureau of Land Management,
    Insert your Office Name & Address Here

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

    James Scrivner
    U.S. Bureau of Land Management, California State Office
    GIS Coordinator
    2800 Cottage Way
    Sacramento, CA 95825
    USA

    916-978-4559 (voice)
    916-978-4580 (FAX)
    jscrivne@ca.blm.gov
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Why was the data set created?

This data set is to be used to illustrate BLM grazing allotments in California, and in GIS analysis such as inventories of features withing BLM grazing allotments in California, and resource conflicts.

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How was the data set created?

  1. Where did the data come from?

    BLM (source 1 of 1)

    Bureau of Land Management, Unknown, .

    Type of source media: disc
    Source scale denominator: varies, 100,000 through GPS'd on the ground data.
    Source contribution:
    raw data, attributes

  2. What changes have been made?

    Date: 20030101 (change 1 of 5)
    The data were gathered from the BLM CA Field Offices.
    A coverage data design was developed.  The data sets
    were then combined into one coverage data set.  Edits
    were then done to produce an accurate unified coverage
    data set of BLM grazing allotments in California.

    Date: 20030806 (change 2 of 5)
    Metadata imported.

    Data sources used in this process:
    • C:\DOCUME~1\jscrivne\LOCALS~1\Temp\xml5.tmp

    (change 3 of 5)
    Dataset copied.

    Data sources used in this process:
    • m:\gis\master\basic\range_mgmt\grzpca

    (change 4 of 5)
    Dataset copied.

    Data sources used in this process:
    • m:\gis\master\basic\range_mgmt\grzpca

    (change 5 of 5)
    Metadata imported.

    Data sources used in this process:
    • \\blm\dfs\ca\pub\gisimage\so\gis\ca_sync\metadata\grzpca.xml

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

  1. How well have the observations been checked?

    The accuracy of the attributes is estimated to be 90 % correct.
    This is based on visual examination both on the screen and in 
    check plots, and through actual use of the data set.

  2. How accurate are the geographic locations?

    This is estimated to be that of a 1:100,000 quadrangle, + /- 120 feet, and
    is based on the source materials integrated into this product.

  3. How accurate are the heights or depths?

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

    These data have no intentinaol omissions, generalizations, or selection criteria
    to create a subset of the entire data.

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

    Polygon and chain-node topology present.
    These data were aggregated out of several separate coverages
    and shapefiles from BLM CA Field Offices into one state-wide
    BLM California grazing allotment coverage.  This was done
    using standard work station ArcInfo coverage editing methods
    to ensure polygon topology, and attribute label consistency.

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How can someone get a copy of the data set?

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

Access constraints: None - Though Subject to Cost Recovery Rules
Use constraints:
These data are public information and may be used and interpreted
by organizations, agencies, units of government, or others.  The user
has sole responsibilty for ensuring the appropriate application of
these data and the U.S. Bureau of Land Management shall not be held
liable for any use or misuse of the data described hereon.

Generally, these data are intented for small scale (1:24,000 and smaller)
natural resource management and planning applications.  It is strongly
recommended that these data be aquired directly from the U.S. Bureau of
Land Management and not indirectly through some other source which may
have changed the data.  It is also strongly recommended that careful attention
be paid to the content of the metadata file associated with these data.  Users
are cautioned that digitial enlargement of these data to scales larger than
that at which they where originally mapped can cause misinterpretation.  Users
are further cautioned that these data and interpretations derived from them
do not eliminate the need for onsite survey and evaluation of specific sites
for intensive uses.

The U.S. Bureau of Land Management should be cited as the data source in any
products derived from these data.

Distributor 1 of 1

  1. Who distributes the data set?

    James Scrivner
    U.S. Bureau of Land Management, California State Office
    GIS Coordinator
    2800 Cottage Way
    Sacramento, CA 95825
    USA

    916-978-4559 (voice)
    916-978-4580 (FAX)
    jscrivne@ca.blm.gov
    Contact Instructions:
    Voice Telephone, 8AM - 5PM Pacific Time

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    These data are provided without the approval of the Director of the U.S.
    Bureau of Land Management and no warranty expressed or implied is made
    regarding the accuracy, completeness, or utility of these data, nor shall
    the act of distribution constitute any such warranty.  Any conclusions drawn
    from the use or misuse of these data are soley the responsibility of the user
    and the U.S Bureau of Land Management shall not be held liable for such use.
    This disclaimer applies both to individual use of these data and aggregate
    use with other data.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

  6. What hardware or software do I need in order to use the data set?

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Who wrote the metadata?

Dates:
Last modified: 20071120
Last reviewed: yyyymmdd

Metadata author:
James Scrivner
U.S. Bureau of Land Management, California State Office
GIS Coordinator
2800 Cottage Way
Sacramento, CA 95825
USA

916-978-4559 (voice)
916-978-4580 (FAX)
jscrivne@ca.blm.gov

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

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html
  • http://www.esri.com/metadata/esriprof80.html
  • http://www.esri.com/metadata/esriprof80.html

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