Land Use & Land Cover, 1992, Snake River Plain, Idaho

Land Use & Land Cover, 1992, Snake River Plain, Idaho

Frequently-asked questions:

What does this data set describe?

Title:
Land Use & Land Cover, 1992, Snake River Plain, Idaho

Abstract: 
Land cover for the Snake River Plain.

Supplemental information: 
Procedures_Used:
USGS 1:24000 scale quadrangle maps were reduced to 1:40000 scale to match 1987
aerial photography.  These photos were then interpreted and land cover was
compiled and transferred to the photo-reduced quads.  The quad maps with the
codes, linework, and attributes were digitized in the Universal Transverse
Mercator Zone 11 or Zone 12 in pcARC/INFO 3.4.1 with an RMS of no greater
than 0.003.  Checkplots were made and checked against the maps from which
they were digitized to ensure quality and consistency and to check for
technician error.  They were then field checked against randomly sampled
areas in 1992.  Dewayne made some revisions in 1996 and original areas were
changed and some areas were added.  Dewayne made some revisions in 1997 to
areas north of Arco, and to a lesser extent around Bruneau and eastern
Caribou county.  Revision 1 was initial compilation of data. Revision 2 was
made after checkplots were made. Revision 3 made after field checks. Revision 4
is the final version after the 1996 additions. Revision 5 is the final version
after the 1997 additions.

  1. How should this data set be cited?

    Idaho Department of Water Resources, 199797, Land Use & Land Cover, 1992, Snake River Plain, Idaho: Idaho Department of Water Resources, Boise, Idaho.

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

    Bounding coordinates:
    West: -117.165100
    East: -110.942261
    North: 44.967043
    South: 41.960265

  3. What does it look like?

    Thumbnail image:

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

    Calendar date: 1992 -97
    Currentness reference: 
    Date that majority of field work completed.

  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 (8194)
      • String (20542)
      • GT-polygon composed of chains (8195)

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

      The map projection used is Transverse Mercator.

      Projection parameters:
      Transverse Mercator
      Scale factor at central meridian: 0.999600
      Longitude of central meridian: -114.000000
      Latitude of projection origin: 42.000000
      False easting: 2500000.000000
      False northing: 1200000.000000

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.000000.
      Ordinates (y-coordinates) are specified to the nearest 0.000000.
      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?

    snaklc92
    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    AREA
    PERIMETER
    IRG
    DESCRIPT
    ACRES
    Entity and attribute overview: 
    >
>SNAKLC92.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                  8    18     F      5
>    9  PERIMETER             8    18     F      5
>   17  SNAKLC92#             4     5     B      -
>   21  SNAKLC92-ID           4     5     B      -
>   25  IRG                   2     2     C      -
>   27  DESCRIPT             35    35     C      -
>   62  ACRES                 4    12     F      1
>
>IRG--this is a short code to describe land cover.
>DESCRIPT--this is the long description of land cover, corresponding to the IRG item:
>IRG      DESCRIPT
>CH       COMMERCIAL HEAVY
>CL       COMMERCIAL LIGHT
>CR       CRP PROGRAM
>D        DAIRY
>DF       DRY FARM
>F        FALLOW
>FL       FEED LOT
>G        GRAVITY IRRIGATION
>GP       GRAVEL PIT
>I        IDLE
>N        NATIVE
>P        PUBLIC
>Q        QUESTIONABLE
>R        RESIDENTIAL
>R1       RES 1 ACRE OR LESS
>R5       RES 1-5 ACRE LOTS
>S        SPRINKLER IRRIGATION
>X        UNKNOWN
>ACRES--This is the amount of acres in each polygon.
>
>SNAKLC92.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                4     5     B      -
>    5  TNODE#                4     5     B      -
>    9  LPOLY#                4     5     B      -
>   13  RPOLY#                4     5     B      -
>   17  LENGTH                8    18     F      5
>   25  SNAKLC92#             4     5     B      -
>   29  SNAKLC92-ID           4     5     B      -
>   33  NEW                  20    20     C      -
>
>NEW--If this is coded with a ORIGINAL (92), these are the arcs from the
>original coverage.  If it is coded with ADDITIONS (96), it means these
>were new areas added by Dewayne McAndrew (BoR) in 1996.  If it is coded
>with ADDITIONS (97), it means these were new areas added by Dewayne
>McAndrew (BoR) in 1997.
>
>SNAKLC92.FRE:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  CASE#                 4     5     B      -
>    5  FREQUENCY             4     5     B      -
>    9  IRG                   2     2     C      -
>   11  DESCRIPT             35    35     C      -
>   46  SYMBOL                3     3     I      -
>

    Entity and attribute detail citation: 
    none
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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)

    • Idaho Department of Water Resources

  2. Who also contributed to the data set?

    Dewayne McAndrew-Bureau of Reclamation David Palmer, Genna Ashley, Chris
Cowling, and Terra Frei-ID Dept of Water Resources

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

    Bill Kramber
    Geospatial Technology
    Idaho Dept. of Water Resources
    Idaho Department of Water Resources
    GIS Analyst
    322 East Front Street
    Boise, Idaho 83720
    USA

    (208) 287-4800 (voice)
    (208) 287-6700 (FAX)
    gisinfo@idwr.idaho.gov
    Hours of Service: 8:00 to 5:00
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Why was the data set created?

To show what land is under agriculture in the Plain and, if it is
irrigated, the method of application sprinkler vs. gravity.

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How was the data set created?

  1. Where did the data come from?

    None (source 1 of 2)

    USGS-National Mapping Division, 1960 - 1990, 1:24000 quadrangle series: 1:24000 quadrangle series, USGS, Reston, Virginia.

    Type of source media: reduced vellum copy
    Source scale denominator: 40000
    Source contribution: 
    Reduced and used as a background for interpreted land use to digitize
from.

    None (source 2 of 2)

    1987, High Altitude Aerial Photography.

    Type of source media: reduced vellum copy
    Source scale denominator: 40000
    Source contribution: 
    Reduced and used as a background for interpreted land use to digitize
from.

  2. What changes have been made?

    Date: 1992 (change 1 of 9) 
    USGS 1:24000 scale quadrangle maps were reduced to 1:40000 scale to
match 1987 aerial photography.

    Date: 1992 (change 2 of 9) 
    The photos were interpreted and land cover was compiled and transferred
to the photo-reduced quads.

    Date: 1992 (change 3 of 9) 
    The quad maps with the codes, linework, and attributes were digitized in
the Universal Transverse Mercator Zone 11 or Zone12 in pcARC/INFO 3.4.1
with an RMS of no greater than 0.003.

    Date: 1992 (change 4 of 9) 
    Checkplots were made and checked against the maps from which they were
digitized to ensure quality and consistency and to check for technician
error. They were then field checked against randomly sampled areas.

    Date: 1996 (change 5 of 9) 
    Dewayne McAndrew-Bureau of Reclamation-made some revisions and original
areas were changed and some areas were added.

    Date: 1997 (change 6 of 9) 
    Dewayne McAndrew made some revisions in 1997 to areas north of Arco, and
to a lesser extent around Bruneau and eastern Caribou county.

    Date: 19980629 (change 7 of 9) 
    First draft of metadata created by Terra Frei using FGDCMETA.AML ver.
1.2 05/14/98 on ARC/INFO data set /d7/state/state/snaklc92


    Dataset copied.

    Metadata imported.

    Data sources used in this process:
    • C:\DOCUME~1\bill.kramber\LOCALS~1\Temp\xml2F.tmp

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

  1. How well have the observations been checked?

    Checkplots were made and checked against the maps from which they were
digitized to ensure quality and consistency and to check for technician
error.

  2. How accurate are the geographic locations?

    The horizontal position was checked with checkplots against the original
maps with the lines and codes on them provided by Dewayne McAndrew of
the Bureau of Reclamation. The positional accuracy conforms to the
national map standards.

  3. How accurate are the heights or depths?

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

    Everything that was recorded on reduced source maps. (Reference the process
steps category.)

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

    ESRI feature type: Simple, Geometry: Polygon, Topology:

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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: Public
Use constraints: 
Classification is limited to agricultural and related activity on the Snake
River Plain. Categories themselves are very general.

Distributor 1 of 1

  1. Who distributes the data set?

    Geospatial Technology
    Idaho Department of Water Resources
    GIS Analyst
    322 East Front Street
    Boise, Idaho 83720
    USA

    (208) 287-4800 (voice)
    (208) 287-6700 (FAX)
    gisinfo@idwr.idaho.gov
    Hours of Service: 8:00 to 5:00

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    The Idaho Department of Water Resources is  making this data available as a public service. The Idaho Department of Water Resources strives to ensure that all technical data and other information made available to the public is accurate, complete and in conformance with the Idaho Public Records Act. Neither the Department of Water Resources nor the State of Idaho, however, assumes any legal responsibility for the accuracy or completeness of the information contained on this site. Persons using information from this site for official purposes, or other purposes, for which accuracy and completeness are required, are hereby notified that they should first verify the information with the public records or other primary sources from which the information was obtained.

  4. How can I download or order the data?

    • Availability in digital form:


      • Data format:
      in format ESRI data format, dependent upon request Size: 11.519
      Network links: http://www.idwr.idaho.gov/gisdata

    • Cost to order the data: To be determined at time of order


  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: 20070108

Metadata author:
Geospatial Technology
Idaho Department of Water Resources
GIS Analyst
322 East Front Street
Boise, Idaho 83720
USA

(208) 287-4800 (voice)
(208) 287-6700 (FAX)
gisinfo@idwr.idaho.gov
Hours of Service: 8:00 to 5:00

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

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

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