Land cover for the Snake River Plain.

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

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.

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

Public

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

>
>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      -
>

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

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

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

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.

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.

none Generated by mp on Mon Jun 29 14:08:36 1998