Title: 1997 center pivot irrigated areas delineated for the Cooperative Hydrology Study in the Central Platte River Basin
Center pivots were on-screen digitized using the 1997 Landsat TM data. All irrigation data were checked for accuracy by Nebraska Natural Resource Districts. This data was collected for use in the Platte River Cooperative Hydrology Study. The original center pivot layer, completed in October of 2000, had duplicate pivots. This center pivot layer has been edited so that there are no duplicate pivots.
The irrigated areas will be a factor when running the hydrologic model on the study area. Irrigation data serve a variety of purposes, from water resources planning to land use planning. This data could also be used for watershed analysis, environmental impact assessments, and other natural resource management activities.
Currentness_Reference: Source date of Satellite Imagery
Theme_Keyword: Central Platte River Basin
Theme_Keyword: Center Pivot Irrigation
Address: University of Nebraska, 113 Nebraska Hall
Center pivot irrigation areas were identified using 1997 Landsat Thematic Mapper (TM) satellite imagery. Satellite imagery collected during the summer of 1997 was displayed while pivots were on-screen digitized. A summer date was selected so that the majority of crops would be at full canopy, allowing for easier identification of center pivots. When questions arose, spring and fall dates of imagery were also displayed. All center pivot coverages were appended into one file and printed on maps divided by Natural Resource Districts. These maps were sent out to each Natural Resource District within the study area and checked for accuracy. Maps were checked using existing knowledge of 1997 irrigated areas and Farm Service Agency reporting records from 1997. When these maps were returned the original vector files were edited and all files were merged into one map for use in the Platte River Cooperative Hydrology Study. Duplicate pivots were identified and removed from this pivot vector layer.
Map_Projection: State Plane FIPS zone 2600
Horizontal_Datum_Name: NAD 83
Ellipsoid_Name: GRS 1980
Entity_Type_Definition: Irrigation Value
0 = Non -Irrigated Areas
1 = Irrigated Areas