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1:24,000 Surficial Hydrography for Salt River Basin, Wyoming
Surficial hydrography developed for the Salt River Basin at a 1:24,000 scale. The layer encompasses part or all of 15 USGS 7.5' quadrangles in western Wyoming, eastern Idaho. Hydrography was developed from US Forest Service Cartographic Feature File (CFF) data. There are two INFO files that can be associated to hydrography using dynamic segmentation. These files are CROSSES and REACHES. Linework and polygon features are attributed with CFF, DLG (Major/Minor) and WWRC hydrographic coding as well as polygon and line feature names identified on USGS quadrangles. Linework is not network capable (no centerlines through polygon features or directionality correction). Purpose: The purpose of this data layer is to provide a base hydrography layer for the Salt River Basin. However, the data may be used for multiple purposes for lands within the Salt River Basin. Range_of_Dates/Times: Beginning_Date: 1966 Ending_Date: 1980 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Revisions as needed. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -111.125 East_Bounding_Coordinate: -110.75 North_Bounding_Coordinate: 43.25 South_Bounding_Coordinate: 42.5 Browse_Graphic: Browse_Graphic_File_Name:
Browse_Graphic_File_Description: Availability of 1:24,000 hydrography in Wyoming.
This data should never be used at a scale larger than 1:24,000.
The data and corresponding attributes are only as accurate as
the source maps from which they were obtained, and may vary depending
upon the date and method of acquisition.
Contact_Person: Data Manager
Spatial Data and Visualization Center
Box 4008 University Station
Laramie, Wyoming 82071-4008
Hours_of_Service: 8:00 5:00 MST
Kevin Toohill, Wyoming Water Resources Center;
United States Forest Service / Bridger Teton National Forest;
Geomatronics Service Center (GSC);
Larry Warren, Bridger Teton National Forest.
Native_Data_Set_Environment: The data is stored in Arc/Info 7.0.4 software for Unix operating system.
No ground accuracy assessment was conducted for the database. Approximately 80% of attribute
information was obtained from the original CFF developed through the Geomatronics Service Center in
Salt Lake City, Utah in cooperation with the National Forest Service. This data was checked for accuracy
by comparing coding with USGS 7.5' quadrangle linework. Ditch/aqueduct arcs were identified and
attributed using information from quadrangle linework including naming conventions ("Ditch",
"Canal", etc.), non-natural linework form (straight, crossing, or equal-elevation hydrographic
arcs), and perennial/intermittent designation.
Approximately 20% of linework and attribute information was obtained from USGS 7.5'
quadrangles. Attributes were checked for consistency with quadrangle linework.
All polygons are closed and contain only one label point and attribute. Duplicate lines have been
removed and all linework has been edgematched at quadrangle boundaries. Linework is missing
where USGS 7.5' quadrangle shows 'marsh' polygon features.
Hydrography linework is complete for all or portions of 15 7'5' quadrangles. This linework includes
the Salt River Basin up to the watershed boundary on the east and up to the quadrangle boundary on the
Idaho, western side. Stream and lake CFF, DLG (Major/Minor), and WWRC attributes are available for
all linework. Hydrographic feature names for USGS coded streams and lakes are complete only for the
stream segments specifically used in this study.
Data produced through the Geomatronics Service Center were initially derived from USGS 7.5'
series quadrangle maps. The CFF vector file was generated to reproduce features within 0.005" of
their location on the source map. This error corresponds to +/- 10 ft (approx. 3 m) ground error.
Overall horizontal positional accuracy cannot be greater than the national mapping accuracy
standards for the USGS source maps, +/- 40 ft (approx. 13 m) ground distance. Snapping and coordinate
shift tolerances were maintained at 2 m or less throughout editing. Total horizontal positional accuracy is
therefore better than +/- 100 ft for all linework.
Title: Cartographic Feature Files
Originator: Geomatronics Service Center/US Forest Service
Type_of_Source_Media: paper map, field validation/addition
Source_Currentness_Reference: Publication date
Source_Contribution: Hydrography linework and polygon feature labels
Import raw data. 80% of the Cartographic Feature File (CFF) data was obtained from Bridger-Teton
National Forest during March, 1996. CFF data was converted by Bridger-Teton National Forest
to ARC/Info format and hydrography line and point/label features were extracted before shipment
to the WWRC (currently held by SDVC). The remaining 20% of the data was obtained directly from
Geometronics Data Center in February, 1998. The data was converted to ARC/Info format hydrography
line and point/label features were extracted.
Edgmatching linework. CFF linework was edgematched along quadrangle
boundaries manually using the ARCEDIT module. Corresponding arc segments were connected at
an approximate midpoint of endpoint node coordinates. ARC/INFO EDGEMATCHING ARCtool was
Topology generation and polygon attributing. Network (line and polygon)
topologic structure was generated using the ARC CLEAN function. Polygon labels were derived
from CFF point/label features. Label errors were identified and corrected, resulting in one unique label
per polygon. Polygon features with unclosed portions (reservoirs and lakes at river inflow/outflow points)
were closed using screen digitization.
Network topology correction. Linework topology was manually checked and
corrected to ensure arc and polygon connectivity where indicated on USGS 7.5' source maps.
Missing linework was noted. Stream direction was NOT checked/corrected.
Final topology generation and check. The appended coverage was topologically-corrected using the
ARC CLEAN function. Arc and polygon topology was checked manually and corrected.
Feature name addition. Stream and lake feature names were added to the line
and label features where identified on USGS 7.5' quadrangles. All arc segments were attributed
with feature names (where applicable).
Addition of DLG (Major/Minor) and WWRC hydrography attributes. Modification of CFF
attributes. USGS Digital Line Graph attributes were added to the line and polygon features
according to USGS standards. Two DLG Minor attributes were added and populated using existing
CFF attribute data and USGS-defined coding relationships. Five original CFF attributes were
reduced to two CFF fields representing primary hydrography coding of linework. A single WWRC
HYDROCODE attribute was added to polygon and line features.
Split linework and add USGS quadrangle identification attribute. The hydrography linework
(including polygon arcs) were split along quadrangle boundaries using the ARC IDENTITY
command with the LINE option. A 1:24,000 quadrangle coverage with a USGS quadrangle ID
attribute was used as the identity coverage. All attributes except the USGS_QD_ID were deleted
from the linework database.
Split linework and add federal land ownership attributes, sub-basin attributes and state name
attributes. Using the ARC INTERSECT command with the LINE option the hydrography linework were
split along land ownership boundaries and state boundaries. The hydrography linework was then clipped
using the watershed boundary for the Salt River Basin. All attributes except ADMN_TYPE1,
STATE_NAME and SUBBASE-NAME were deleted from the linework database.
Grid_Coordinate_System_Name: Universal Transverse Mercator
Planar_Coordinate_Encoding_Method: row and column
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
The arc attribute file contains these items:
>403=perennial stream,double line
>405= intermittent stream
>410=perennial lake or pond
>412=intermittent lake or pond
>413=reservoir, natural shoreline
>0200=shoreline, 0412 = stream, 0414=ditch or canal
>0202= closure line
HYDRONAME- Feature names from USGS 7.5' quadrangle series
>SOURCE- Source of hydrography linework
>1= digitized at WWRC
>2=Cartographic Feature File
>USGS_QD_ID: USGS 7.5' quadrangle identification code (Block groups)
>DWTRSTAT - Identifies the dewater status of the stream
>frequently = stream is frequently dewatered during the year
>infrequently = stream is infrequently dewatered during the year
>seldom= stream is seldom dewatered during the year
>never = the stream is never dewater during the year
The polygon attribute file contains these items:
>0 = non-hydrographic polygon
>2= intermittent lake)
>CFF1 (402=perennial stream, 410=perennial lake/pond, 412=intermittent lake/pond,
>CFF2 (410= perennial lake/pond)
>DLGMINOR1 (412= stream, 421=lake or pond)
>HYDRONAME: Feature names from USGS 7.5' quadrangle series
>SOURCE (1=digitized at WWRC, 2=CFF, 4=WWRC/CFF)
>ADMN_TYPE1: Identifies if the property is owned by the federal government
or not. Identifies the type of property holding (e.g. national forest or grassland)
>STATE_NAME: Name of the state the water body is located in.
>SUBBASE-NAME: Name of the sub-basin that the water body is located in
Cartographic Feature File code documentation and vintage attributes can be obtained
from the Geometronics Service Center (GSC), ATTN: Data Library, 222 West 2300 South,
Salt Lake City, UT, 84119. (801) 975 3440.
Digital Line Graph (DLG) code documentation can be obtained from the USGS.
Contact_Person: Margo Berendsen
Address_Type: mailing address
Address: Box 4008 University Station
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
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