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Landtype Associations for Southeast Wyoming

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: William Reiners, Rob Thurston, Department of Botany
Publication_Date: 199711
Title: Landtype Associations for Southeast Wyoming
Online_Linkage: www.sdvc.uwyo.edu/clearinghouse/ecoregion.html  
Description:
Abstract:
This dataset is a scientifically based, hierarchical system of map units for southeastern Wyoming that incorporates ecological principles and processes across a range of scales. Data are also available in a separate coverage for southwestern Wyoming, and is under development for the rest of Wyoming. The southeastern area includes all of Natrona, Albany, Platte, Goshen and Laramie Counties and parts of Converse, Niobrara and Carbon Counties. These units are a mapping of terrain features having similar terrain configuration, ecological properties and management implications within which situational landscape-ecosystems can logically and conveniently be defined. While the process of delineation of these units is subjective, the units are hierarchically nested into the structure of the ECOMAP (1993) national hierarchy of ecological units. The data-set includes Landtype Associations as well as higher hierarchical units in which Landtype Associations are imbedded. Landtype Associations are defined by ECOMAP (1993) as units at the "landscape scale" as follows: "groupings of Landtypes or subdivisions of Subsections based upon similarities in geomorphic process, geological rock types, soil complexes, stream types, lakes, wetlands, and series, subseries, or plant association vegetation communities. Repeatable patterns of soil complexes and plant communities are useful in delineating map units at this level. Names of Landtype Associations are often derived from geomorphic history and vegetation community." Mountainous terrain was delineated only at the higher subsection level as finer sub-divisions are the purview of the U.S. Forest Service.

Purpose:

This dataset is the result of a contract between the Bureau of Land Management (BLM) and the University of Wyoming Dept. of Botany to delineate a hierarchical set of landunits for southeast Wyoming. These results will also contribute to a multi-agency effort to develop a common ecological map of the United States. The purpose of these units is ultimately to provide a framework for organizing data for resource management by ecological units instead of political units.

Time_Period_of_Content:

Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1976
Ending_Date: 1994
Currentness_Reference: Publication date of sources  
Status:
Progress: complete
Maintenance_and_Update_Frequency: potential updates pending need and funding.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -107.547
East_Bounding_Coordinate: -104.052
North_Bounding_Coordinate: 43.502
South_Bounding_Coordinate: 40.997  
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: ecological unit
Theme_Keyword: landscape unit
Theme_Keyword: landform
Theme_Keyword: landtype association
Theme_Keyword: ecosystem
Theme_Keyword: ECOMAP  
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Wyoming
Place_Keyword: Southeast Wyoming
Place_Keyword: Natrona county
Place_Keyword: Albany county
Place_Keyword: Platte county
Place_Keyword: Goshen county
Place_Keyword: Laramie county
Place_Keyword: Converse county
Place_Keyword: Niobrara county
Place_Keyword: Carbon county
Access_Constraints: none
Use_Constraints:
This dataset has been compiled and interpreted from a broad range of source data, ranging in scale from 1:24,000 to 1:500,000. Please consult the Source section (in Data Quality, Lineage) of this document for more details about the source data and their contribution to this dataset.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Rob Thurston
Contact_Organization: Department of Botany
Contact_Address:
Address_Type: mailing address
Address: Box 3165 University Station
City: Laramie
State_or_Province: Wyoming
Country: USA
Postal_Code: 82071
Contact_Voice_Telephone: 307-766-2484
Contact_Electronic_Mail_Address: thurston@uwyo.edu
Hours_of_Service: 9 AM to 5 PM MST
Browse_Graphic:
Browse_Graphic_File_Name: <URL:http://www.sdvc.uwyo.edu/images/land_se.gif>
Browse_Graphic_File_Description: Landtype associations for southeastern Wyoming
Browse_Graphic_File_Type: gif
Data_Set_Credit:
U.S. Bureau of Land Management: Jon Johnson, Bill Daniels
Native_Data_Set_Environment:
The dataset was created in and is stored in Arc/Info 7.0.3 software for Unix operating system. It is a vector coverage with both line and polygon topology.
Cross_Reference:
Citation_Information:
Originator: ECOMAP
Publication_Date: 1993
Title: National hierarchical framework of ecological units.
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: ECOMAP, USDA Forest Service
Cross_Reference:
Citation_Information:
Originator: Freeouf, J.A.
Publication_Date: 1996
Title:
Ecoregions and subregions of Region 2 - Subsections. State of Wyoming. 1:1,000,000 map.
Publication_Information:
Publication_Place: Denver, CO
Publisher: USDA Forest Service, Rocky Mountain Region
Cross_Reference:
Citation_Information:
Originator: Daly, C., R.P. Neilson, and D.L. Phillips.
Publication_Date: 1994
Title:
A statistical-topographic model for mapping climatological precipitation over mountainous terrain.
Publication_Information:
Publication_Place: n/a
Publisher: Journal of Applied Meteorology 33 (2):140-158
Cross_Reference:
Citation_Information:
Originator: Bailey, R.G.
Publication_Date: 1996
Title: Ecosystem Geography
Publication_Information:
Publication_Place: New York
Publisher: Springer-Verlag  
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attributing landtype associations is a subjective process. See Horizontal Positional Accuracy for more details.
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: unknown
Attribute_Accuracy_Explanation: none
Logical_Consistency_Report:
All polygons are closed and adjacent polygons do not have identical attributes. Polygons do not have duplicate labels.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
There are many factors that affect the accuracy of the delineations in the Landtype Association coverage. The main source of error (or uncertainty) is the judgement on our part as to what units should be mapped and the criteria for delineating these units. For each map unit, there was a multitude of decisions to be made. Someone else, using their best judgement, might come up with lines that deviate significantly from ours.

A second source of error is the error associated with the GIS layers used in making the delineations. The main layers that were used and an estimate of the horizontal accuracy for each layer is listed.  

Counties (+/- 50 meters); see note 1
DEM (30 meter resolution, +/- 15); see note 2
DEM (90 meter resolution, +/-100); see note 2
Geology (+/- 700); see note 3
Hydrography (+/- 50); see note 2
Hydrologic units (+/- 700); see note 4
Land Cover (+/- 250); derived from Thematic mapper dataset; see note 3
Thematic Mapper (+/- 200); original dataset was not terrain corrected
and was resampled up to 100m resoultion; see note 3
Note 1: Accuracy estimate based on the assumption of a 0.5 mm digitizing error.

Note 2. Accuracy estimate from the "Geo-Positioning Selection Guide" developed by the U.S. Department of Interior, Bureau of Land Management (U.S. Government Printing Office: 1992-676-687).

Note 3. Accuracy estimate based on a comparison of the positions of large lakes and reservoirs and major rivers in the GIS layer with the positions of the corresponding features in the USGS 1:100,000 hydrography DLG coverage.

Note 4. Accuracy estimate based on a comparison of the line along the continental divide in the Wind River Range with the corresponding lines in the counties coverage, which forms the boundary between Sublette and Fremont counties.

Some of the arcs in the Landtype Association coverage were taken directly from the source layers, so the errors associated with these arcs carried over to the Landtype Association coverage. Other arcs were digitized on-screen with a variety of background displays. In this case, there was not only the error associated with the GIS layer used for the background display, but also a digitizing error. The most common background display was shaded relief derived from 30 m DEM data, with the display zoomed to a scale of about 1:24,000. When there were distinct topographic features to follow, the lines drawn were within 1 to 2 pixels of the desired location (30-60 m with 30 m DEM data). When the features were less distinct, the position of the line involved more judgement. Often, selected geology polygons were displayed on top of the shaded relief with hatched patterns to guide the digitizing. In this situation, the horizontal accuracy could vary significantly depending on whether the delineation closely followed the relief or the geology.

Since the accuracy associated with a given delineation depends on many factors and since these factors may vary for different parts of the delineation, it is difficult to specify a single number that reflects the true accuracy situation. Lines based on distinct features visible in the 30 m shaded relief displays are going to be more accurate than lines based on 90 m data or lines based on the geology coverage or the hydrologic units coverage. In an effort to document the source/criteria for each delineation and to provide some sense of accuracy, the arcs in the Landtype Association coverage were attributed with a 3-digit code in the SOURCE field. Codes ranging from 101 to 199 indicate lines obtained directly from other coverages, while codes from 201 to 299 indicate lines digitized on-screen with the specified background display. In addition to the SOURCE field, each arc has a NOTE field that contains a brief description of the criteria used in making the delineation.  

Completeness_Report:
All the arcs of the Landtype Association coverage have been attributed to indicate the source data and digitizing criteria. All polygons have been attributed with a series of codes representing the hierarchy of landscape units they are part of.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Title: Thematic Mapper satellite image data
Originator: Wyoming Gap Analysis Project
Publication_Date: 1994
Source_Scale_Denominator: 100000
Type_of_Source_Media: digital image
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1988
Ending_Date: 1993
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: TM data
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Bedrock Geology <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/bedgeol.html>
Originator: Green and Drouillard, USGS
Publication_Date: 1994
Source_Scale_Denominator: 500000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: geology
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Digital Elevation Models, 90 meter resolution: <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dem90.html>
Originator: USGS
Publication_Date: unknown
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1961
Ending_Date: 1981
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DEM
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Digital Elevation Models, 30 meter resolution: <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dem30.html>
Originator: USGS
Publication_Date: unknown
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1984
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DEM
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Mean annual precipitation data generated using algorithms developed by Daly et al. (1994) Original raster data cell size 5 km.
Originator: Oregon Climate Service
Publication_Date: 1994
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: precipitation
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Wyoming Land Cover <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/landcov.html>
Originator: Wyoming Gap Analysis
Publication_Date: 1994
Source_Scale_Denominator: 100000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1988
Ending_Date: 1993
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: land cover
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title: Hydrological unit delinations
Originator: Wyoming Water Resources Center
Publication_Date: 1976
Source_Scale_Denominator: 500000
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1976
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: hydrologic units
Source_Contribution: analysis layer
Source_Information:
Source_Citation:
Citation_Information:
Title:
Digital Line Graphs: hydrography for Wyoming <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/hydro100k.html>
Originator: USGS
Publication_Date: 1989
Type_of_Source_Media: digital map
Source_Scale_Denominator: 100000
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: unknown
Source_Citation_Abbreviation: Hydrography
Source_Contribution: analysis layer
Process_Step:
Process_Description:
These analysis layers were used interactively to compare the information in each. In general, once distinct units were identified at any hierarchical level, they were delineated with data for whichever variable was the principal controlling factor at a given arc along a polygon. This is essentially the "method of controlling variables" described by Bailey (1996) in which the appropriate controlling variable is selected to set the boundary of a particular land unit.
Process_Date: 1996
Source_Used_Citation_Abbreviation: analysis layers
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 867
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 1007
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 161

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: .001
Longitude_Resolution: .001
Geographic_Coordinate_Units: Decimal Degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:

All meaningful attributes are included in the polygon attribute table And arc attribute table (.PAT and .AAT) that accompanies the ARC/INFO coverage.

In the polygon attribute table, all coding was done within the fields MCODE, PCODE, SCODE, SSCODE, LTACODE and a descriptive character field, LTANAME.

MCODE: this field is either blank of contains an M to indicate mountains.
PCODE: This field contains a three digit code to indicate the province.
SCODE: This field contains a single uppercase letter (A, B, C, . . .)
to indicate the section.
SSCODE: This field contains two lowercase letters to indicate the subsection.
The first letter can be any letter of the alphabet. The second letter will
be either a 'w' for Wyoming to indicate delineations by Reiners and Thurston
that significantly differ from Freeouf (1996) or an 'f' for Freeouf
where there is relative agreement.
LTACODE: This field contains a two digit code to indicate the landtype association.
Code Landtype Association
11 Mountain (not subdivided into LTAs)
21 Isolated Mountain
22 Granite Hills
25 Channeled Hills
26 Footslopes
33 Dissected Plateau
35 Breaks
36 Mesa
41 Recessional Escarpment
51 Multiple Cuesta and Valley Complex
52 Single Cuesta
61 Glacial Till and Outwash Hills
71 Rolling Plains
72 Rolling Plains and Alluvial Valleys
82 Major River Valley
83 Lake/Reservoir
LTANAME: This field contains the name of the landtype association.

For the arc attribute table, all the coding is in the TYPE, SOURCE and NOTE fields.

TYPE: This field contains a one or two digit code that indicates the line type.

Code    Line Type
2 Division
3 Province
4 Section
5 Subsection
6 Landtype Association
11 County Boundary
12 State Boundary
SOURCE: this field contains a three digit code that indicates the source GIS layer for the arc, the background display used for on-screen digitizing, or the source map for on-tablet digitizing.

Arcs copied directly from specified coverages

101  	County boundaries
105 Hydrologic units
106 Geology
107 Hydrography
Arcs digitized on-screen with the specified background displays and manually smoothed.
202  	Geology
204 Streams
205 30 m shaded relief
206 90 m shaded relief
207 30 m shaded relief with hatched geology following relief using
geology as a guide
208 30 m shaded relief with hatched geology following geology primarily
209 90 m shaded relief with hatched geology following geology primarily
215 No background
216 100 m thematic mapper imagery (4,5,3 (RGB))
218 30 m shaded relief with elevation contour following relief using
elevation as a guide
224 90 m shaded relief with streams
226 30 m shaded relief with slope contour at about 4 degrees following
relief using contour as a guide
227 30 m shaded relief guided by 60 m shaded relief calculated from 90 m > DEM data reclassified into 50 m intervals
229 30 m shaded relief following relief guided by hatched geology and
slope contour at about 4 degrees
230 30 m shaded relief following relief guided by hatched geology and
slope contour at about 10 degrees
231 30 m shaded relief with slope contour at about 10 degrees following
relief using contour as a guide
Arcs digitized from paper maps
301  	Lusk  (1:100,000, folded)
304 Torrington (1:100,000, folded)
305 Douglas (1:100,000, folded)
306 Laramie (1:100,000, unfolded)
307 Rock River (1:100,000, unfolded)
308 Torrington (1:100,000, unfolded)
309 Baggs (1:100,000, folded)
310 Rawlins (1:100,000, folded)
311 Cheyenne (1:100,000, unfolded)
312 Chugwater (1:100,000, unfolded)
NOTE This field contains comments concerning the source of the arc or the criteria used when digitizing the arc.
Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Data Manager
Contact_Organization: Spatial Data and Visualization Center
Contact_Address:
Address_Type: mailing address
Address: Box 4008 University Station
City: Laramie
State_or_Province: Wyoming
Country: USA
Postal_Code: 82071
Contact_Voice_Telephone: 307-766-2735
Contact_Electronic_Mail_Address: n/a
Distribution_Liability:
The distributor shall not be held liable for improper or incorrect use of this dataset, based on the description of appropriate/inappropriate used described in this metadata document. It is strongly recommended that this dataset is directly acquired from the distributor described above and not indirectly through other sources which may have changed the data in some way.  
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE (Arc/Info export)
Format_Version_Number: 7.1
Format_Version_Date: 1996
File_Decompression_Technique: Export file was created using defaults, no compression
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: ftp.sdvc.uwyo.edu or <http://www.sdvc.uwyo.edu/clearinghouse>
Access_Instructions: <http://www.sdvc.uwyo.edu/clearinghouse/howto.html>
Online_Computer_and_Operating_System:
Both the ftp and WWW server which this dataset is available from is a Silicon Graphics Challenge server, running the IRIX 6.2 UNIX operating system.
Fees:
No fees required for downloading datasets that are on-line. Some fees may be required to cover costs of tapes if data are required on tape media.

 

Metadata_Reference_Information:

Metadata_Date: 19980216
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Margo Berendsen
Contact_Address:
Address_Type: mailing address
Address: Box 4008 University Station
City: Laramie
State_or_Province: Wyoming
Postal_Code: 82071
Country: USA
Contact_Voice_Telephone: 307-766-2751
Contact_Electronic_Mail_Address: meh@uwyo.edu
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.4.13 on Mon Sep 18 14:39:49 2000