Kearney County Irrigation Estimate Metadata - 2002

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: CALMIT
Publication_Date: March 2003
Title: kearney_irr_2002
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: CALMIT
Publisher: University of Nebraska - Lincoln
Description:
Abstract:
Irrigated lands estimate for Kearney County, summer 2002. This file was created using satellite imagery and field data to estimate irrigated lands during the drought of 2002.
Purpose:
This shapefile was created as part of a COHYST (Cooperative Hydrology in the Central Platte River Basin) sponsored study to determine if a satellite derived vegetation index (NDVI) could be used to identify irrigated fields during the summer of 2002.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: March 2003
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -99.182817
East_Bounding_Coordinate: -98.718468
North_Bounding_Coordinate: 40.687924
South_Bounding_Coordinate: 40.346479
Keywords:
Theme:
Theme_Keyword: Irrigated Lands
Theme:
Theme_Keyword: Irrigation Identification
Place:
Place_Keyword: Kearney County, NE
Stratum:
Stratum_Keyword: Cooperative Hydrology Study in the Central Platte River Basin
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Patti Dappen
Contact_Organization: CALMIT
Contact_Position: Director
Contact_Address:
Address_Type: mailing address
Address: 113 Nebraska Hall
City: Lincoln
State_or_Province: NE
Postal_Code: 68588-0517
Contact_Voice_Telephone: 402.472.6729
Contact_Electronic_Mail_Address: bwardlow2@unl.edu
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.2.0.700


Data_Quality_Information:
Lineage:
Process_Step:
Process_Description:
Landsat 7 satellite imagery was acquired for Kearney County on August 14th, 2002. The Normalized Difference Vegetation Index (NDVI) was calculated for this date to measure the health and vigor of vegetation. Using field data collected in the fall of 2002, significant threshold NDVI values were identified in the image. A non-agricultural mask was applied to the NDVI image to remove non-agricultural areas from the analysis. Using the field data it was determined that NDVI values greater than 129 were found to represent the most irrigated pixels with out significantly misclassifying non-irrigated pixels. A series of filters were applied to this raster file to eliminate mixed pixels. This final raster file was converted to a shapefile.
Process_Date: February 2003
Process_Step:
Process_Description: Metadata imported.


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 2993


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 2600
Lambert_Conformal_Conic:
Standard_Parallel: 40.000000
Standard_Parallel: 43.000000
Longitude_of_Central_Meridian: -100.000000
Latitude_of_Projection_Origin: 39.833333
False_Easting: 1640416.666667
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000256
Ordinate_Resolution: 0.000256
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: kearney_irr_2002
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute:
Attribute_Label: PERIMETER
Attribute:
Attribute_Label: KEARNEY_IR
Attribute:
Attribute_Label: KEARNEY__1
Attribute:
Attribute_Label: GRID_CODE
Attribute_Definition: Irrigation Code, 0 = non-irrigated, 1= irrigated

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