Ten Class DEM Derived Landform for the Southwest United States

Metadata also available as - [Parseable text]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
RS/GIS Laboratory, College of Natural Resources, Utah State University
Publication_Date: 20040915
Title: Ten Class DEM Derived Landform for the Southwest United States
Edition: version 1.0
Geospatial_Data_Presentation_Form: raster digital data
Other_Citation_Details:
Manis, Gerald, John Lowry, and R. Douglas Ramsey. 2001. Preclassification: An Ecologically Predictive Landform Model. Gap Analysis Program Bulletin No. 10, December 2001. USGS GAP Analysis Program. Moscow, Idaho.
Online_Linkage: <http://earth.gis.usu.edu/swgap/>
Larger_Work_Citation:
Citation_Information:
Originator: USGS GAP Analysis Program
Publication_Date: Unpublished material
Title:
Tentative title "Southwest Regional GAP Analysis Project Final Report."
Description:
Abstract:
Ten landform position classes were defined by topographic position and slope gradients using a GIS model. The 10 landform classes are: 1) Valley flats, 2) Gently sloping toe slopes, 3) Gently sloping ridges, fans and hills, 4) Nearly level terraces and plateaus, 5) Very moist steep slopes, 6) Moderately moist steep slopes, 7) Moderately dry steep slopes, 8) Very dry steep slopes, 9) Cool aspect scarps, cliffs and canyons, and 10) Hot aspect scarps, cliffs and canyons. The GIS model was created using ArcInfo AML and a 30 meter DEM (digital elevation model). DEM data was from the USGS National Elevation Dataset (1999). The geographic extent for the modeling area was the states of Arizona, Colorado, New Mexico, Nevada and Utah. While the modeling area encompassed these 5 southwestern states, the actual GIS dataset accompanying this metadata file may be a subset of the 5-state region.
Purpose:
The landform GIS dataset may be used for various purposes with user's discretion. Specifically, this dataset was created to be used in conjunction with several other predictor datasets for regional vegetation modeling/mapping. Formal validation of this dataset has not been conducted.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999 (year National Elevation Dataset obtained)
Currentness_Reference: publication date
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Description_of_Geographic_Extent: Southwestern United States
Bounding_Coordinates:
West_Bounding_Coordinate: -120
East_Bounding_Coordinate: -101
North_Bounding_Coordinate: 42
South_Bounding_Coordinate: 30
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: landform
Theme_Keyword: topographic position
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Southwest U.S.
Place_Keyword: Arizona
Place_Keyword: Colorado
Place_Keyword: New Mexico
Place_Keyword: Nevada
Place_Keyword: Utah
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Remote Sensing/GIS Laboratory, College of Natural Resources, Utah State University
Contact_Person: John Lowry
Contact_Address:
Address_Type: mailing
Address: UMC 5275
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: USA
Contact_Voice_Telephone: 435-797-0653
Data_Set_Credit:
Gerald Manis and John Lowry, RS/GIS Laboratory, College of Natural Resources, Utah State University

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
A formal assessment of the accuracy of this dataset has not been conducted.
Logical_Consistency_Report: Not applicable for grid datasets.
Completeness_Report:
The Minimum Mapping Unit (MMU) is approximately 1 acre. See Processing Steps for more details.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Eros Data Center, United States Geological Survey, National Elevation Database
Publication_Date: 1999
Title: 30 meter Digital Elevation Model
Geospatial_Data_Presentation_Form: digital raster (ArcInfo grid)
Online_Linkage: <http://ned.usgs.gov/>
Type_of_Source_Media: digital
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: USGS
Source_Contribution:
A digital elevation model (DEM) obtained from the National Elevation Dataset (NED) in 1999 was used to generate the landform GIS dataset.
Process_Step:
Process_Description:
Processing steps:

Original data: 30 meter National Elevation Database GRID format (1999)

The Landform grid was created using Arc Macro Language (AML) in a two step process. Step 1: A Topographic Relative Moisture Index (TRMI) ArcInfo grid was generated using TRMIM.AML. Step 2: The Landform grid was created using LANDFORM.AML, which required the TRMI grid created in Step 1 and an elevation grid as inputs.

The 5-state region was initially divided into approximately 40 mapping zones. Landform grids were created for each mapping zone, which were then appended together forming a reional landform mosaic.

The following outlines the steps:

In ArcInfo grid: 1) Using TRMIM.AML (1-28 class) created the TRMIM grid for each mapping zone. 2) Clipped 1000 meters from the outer boundary of the TRMIM grid. 3) Merged TRMIM grids together for each state. 4) Using LANDFORM.AML created a Landform grid for each state. 5) Merged the state Landform grids together. 6) Converted 5-state grid to .img format.

Smoothing filters were applied in ERDAS Imagine:

In Imagine: 1) Ran 3x3 neighborhood majority filter across all 10 classes 2) Ran 5x5 neighborhood majority filter across classes 1 & 4 only 3) Ran 2nd 5x5 neighborhood majority filter across classes 1 & 4 only 4) Used CLUMP GIS function with 8 connected neighbors 5) Used ELIMINATE GIS function w/ minimum pixels to eliminate at 4 pixels (1 acre)

To remove irregularities that occurred in very large, flat areas such as the basins in Utah, Nevada and some parts of Arizona, these were screen digitized as an area of interest (.aoi) and recoded to "valley flats."

Notes: for more information see the TRMIM.AML & LANDFORM.AML for details on parameters used.

The 10 landform classes are:

1) valley flats 2) toe slopes, bottoms and swales 3) gently sloping ridges and hills 4) nearly level plateaus or terrace 5) very moist steep slopes 6) moderately moist steep slopes 7) moderately dry slopes 8) very dry steep slopes 9) cool aspect scarps, cliffs and canyons 10) hot aspect scarps, cliffs and canyon

For Citations see:

Parker, A. J. 1982. The topographic relative moisture index: An approach to soil-moisture assessment in mountain terrain. Physical Geography, 1982, 3,2, pp. 160-168.

Haplin, P. 1999. GIS analysis for conservation site design: A short-course developed for The Nature Conservancy. Nicholas School of the Environment - Landscape Ecology Laboratory, Duke University.

Process_Date: 200305

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: raster
Raster_Object_Information:
Raster_Object_Type: grid cell
Row_Count: 45822
Column_Count: 51431

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: albers conical equal area
Albers_Conical_Equal_Area:
Standard_Parallel: 29 30 0.000
Standard_Parallel: 45 30 0.000
Longitude_of_Central_Meridian: -96 0 0.000
Latitude_of_Projection_Origin: 23 0 0.000
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 30
Ordinate_Resolution: 30
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Fields in the landform dataset are:

VALUE: Unique identifier required by the software

COUNT/HISTOGRAM: Number of cells/pixels for the landform class

RED: Required for display in Imagine

GREEN: Required for display in Imagine

BLUE: Required for display in Imagine

CLASS_NAMES: Landform class names.

The field CLASS_NAMES contains one of the following attributes: 1) valley flats (or water bodies) 2) toe slopes, bottoms and swales 3) gently sloping ridges and hills 4) nearly level plateaus or terrace 5) very moist steep slopes 6) moderately moist steep slopes 7) moderately dry slopes 8) very dry steep slopes 9) cool aspect scarps, cliffs and canyons 10) hot aspect scarps, cliffs and canyon

OPACITY: Required for display in Imagine.

Entity_and_Attribute_Detail_Citation:
Manis, Gerald, John Lowry, and R. Douglas Ramsey. 2001. Preclassification: An Ecologically Predictive Landform Model. Gap Analysis Program Bulletin No. 10, December 2001. USGS GAP Analysis Program. Moscow, Idaho.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Lowry
Contact_Organization: RS/GIS Laboratory, Utah State University,
Contact_Address:
Address_Type: mailing address
Address: UMC 5275, Utah State University
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: U.S.A.
Contact_Voice_Telephone: 435-797-0653
Contact_Electronic_Mail_Address: jlowry@gis.usu.edu
Resource_Description: Southwest ReGAP Landform dataset
Distribution_Liability:
The RS/GIS Laboratory and Utah State University or their staff take no responsibility for the distribution, content, or use of these data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:
"ERDAS" ERDAS image files (ERDAS Corporation) or ArcInfo GRID format (ESRI)
Format_Version_Number: ERDAS Imagine 8.6 or Workstation ArcInfo 8.0.2
File_Decompression_Technique:
Compression type *.zip or *.tgz. For windows use WinZip. For UNIX use tar -zxf <filename>.tgz
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://earth.gis.usu.edu/swgap/>
Fees: none

Metadata_Reference_Information:
Metadata_Date: 20040811
Metadata_Review_Date: 20040915
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Lowry
Contact_Organization: RS/GIS Laboratory, Utah State University
Contact_Address:
Address_Type: mailing
Address: UMC 5275, Utah State University
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: U.S.A.
Contact_Voice_Telephone: 435-797-0653
Contact_Electronic_Mail_Address: jlowry@gis.usu.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
Metadata_Security_Information:
Metadata_Security_Classification_System: none
Metadata_Security_Classification: unclassified
Metadata_Security_Handling_Description: none
Metadata_Language: English

Generated by mp version 2.7.33 on Thu Sep 23 17:23:54 2004