landcover97_metadata.html

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Publication_Date: 200010

Title: Delineation of 1997 Land Use Patterns for the Cooperative Hydrology Study in the Central Platte River Basin

Publication_Information:

Publisher: CALMIT

Description:

Abstract:
          The raster land use/land cover data is a digital product of a supervised

classification derived from multi-date 1997 Landsat Thematic Mapper (TM) satellite imagery.  Field data for crops were obtained using Farm Service Agency (FSA) records from 1997.  The National Wetland Inventory was used in assisting the wetland classification. Urban areas were defined using 1990 TIGER data, and other information were gathered using 1993 Digital Orothophoto Quarter Quadranges (DOQQ's). Irrigation information was obtained from the Nebraska Department of Natural Resources, Public Power Districts, and Natural Resource Districts.  Center pivots were on-screen digitized using the 1997 Landsat TM data.  All irrigation data were checked for accuracy by Nebraska Natural Resource Districts.   The cell size for the data is 28.5 meters and there are 26 different land use/land cover classes. This product is in ERDAS Imagine format.

Purpose:

The landuse/land cover data can be used as a digital layer in various studies.  It is useful as a background layer in a GIS, and can also be merged with other digital data (ie DEM's or DOQ's) to  produce a hybrid digital file.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time: 200010

Currentness_Reference: Publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:  -104.162
East_Bounding_Coordinate:   -97.318
North_Bounding_Coordinate:   42.518
South_Bounding_Coordinate:   40.002

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Land cover

Theme_Keyword: Land use

Theme_Keyword: Nebraska

Theme_Keyword: Central Platte River Basin

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary: CALMIT

Contact_Address:

Address: University of Nebraska, 113 Nebraska Hall

City: Lincoln

State_or_Province: NE

Postal_Code: 68588

Country: USA

Data_Quality_Information:

Process_Step:

Process_Description:

Multidate Landsat Thematic Mapper (TM) imagery were used to generate land use/land cover maps for 1997. Cloud coverage dictated date selection to the greatest extent, although imagery was chosen to represent spring, summer, and fall growing conditions. Landsat TM channels 1 and 6 were subset from the imagery and all three dates were stacked into one 15-band file .  Before the supervised classification was run, clouded and urban areas areas were removed from the imagery. Urban areas were defined using 1990 TIGER data.  Clouded areas were classified in a second stage, using an unsupervised classification with the remaining unclouded dates. Field data for crops were obtained using Farm Service Agency (FSA) records from 1997.  Spectral signatures for cropland were collected by identifying homogeneous areas defined on FSA reporting records.  The National Wetlands Inventory (NWI) was used to locate wetland areas to collect spectral signatures.  Signatures were collected from wetlands greater than 3X3 pixels or 90X90 meters square in size.  1993 Digital Orthohoto Quarter Quadrangles were used to locate signature areas for riparian or forested areas, roads, and non-ag. features.  Multiple spectral signatures for each class were extracted and evaluated for continuity. Unrepresentative signatures were deleted.  The remaining signatures were then merged by class and a maximum likelihood supervised classification was run on the 15-band imagery.  After the classification algorithm was run, classes were evaluated for accuracy.  A 'cluster busting' technique was applied to compensate for mixed classes.  Irrigation information was obtained from the Nebraska Department of Natural Resources, Public Power Districts, and Natural Resource Districts.  Center pivots were on-screen digitized using the 1997 Landsat TM data.  All irrigation data were checked for accuracy by Nebraska Natural Resource Districts using 1997 FSA reporting records.  The cell size for the data is 28.5 meters (93.48 feet) and there are 26 different land use/land cover classes.

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Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection: State Plane Fipszone 2600

Geodetic_Model:

Horizontal_Datum_Name: NAD 83

Ellipsoid_Name: GRS 1980

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Entity_and_Attribute_Information:

Each raster entity or pixel contains a value and the associated land use/land cover classes are defined.

 

                          Land Use/ Land Cover Classes
 

      VALUE      CLASS NAME
             1               Irrigated Corn
             2               Irrigated Sugar Beets
             3               Irrigated Soybeans
             4               Irrigated Sorghum (Milo, Sudan)
             5               Irrigated Dry Edible Beans
             6               Irrigated Potatoes
             7               Irrigated Alfalfa
             8               Irrigated Small Grains
             9               Range/Pasture/Grass (Brome, Hay, CRP)
            10              Urban Land
            11              Open Water
            12              Riparian Forest and Woodlands
            13              Wetlands

                      14              Other Agricultural Lands (Farmsteads, Feedlots, etc.)
                      15              Irrigated  Sunflower
                      16              Summer Fallow
                      17              Roads
                      18              Dryland Corn
                      19              Dryland Soybeans
                      20              Dryland Sorghum
                      21              Dryland Dry Edible Beans
                      22              Dryland Alfalfa
                      23              Dryland Small Grains
                      24              Dryland Sunflower
                      25              Dryland Sugar Beets
                      26              Dryland Potatoes
 
 

Overview_Description:

Entity_and_Attribute_Overview: NA

Entity_and_Attribute_Detail_Citation: NA

Metadata_Reference_Information:

Metadata_Date: 200010