Locations of observed center-pivot systems in Nebraska
Summarize center-pivot irrigation activity in Nebraska
ground condition
None, but the following should be included in citations: "The Conservation and Survey Division has produced this product using what is thought to be the most reliable information available or reproduced the material as provided. The detail and precision of the interpretations made are according to accepted professional standards and are dependant upon the techniques, hardware, and/or software utilized."
113 Nebraska Hall
Pivot locations were detected on satellite photos (grass grows in circles) and converted into a legal location for the tabular data base. Observations were made annually commencing in 1972 and ending in 1988. If a pivot appeared to be inactive, it was not included for the current year, but retained. In 1988, the pivots were digitized into the ArcInfo data base, and 'legals' were not added for the newly observed pivots. Pivot locations are accurate to within a 160 acre area.
Manual operations invite human errors, but paper plots of the pivot locations from the data base aligned 'fairly well' according to the last observer in 1989.
Coverage is state-wide but no updates are planned.
1:1,000,000 scale published maps issued annually 1975-1988
Over a period of years CSD remote sensing staff inventoried over 33,000 center pivot systems that could be observed by satellites. They assigned a legal description to each site as observed, and tabulated the information. A computer program converted the legal into lat/long coordinates and a unique key for each pivot. The ArcInfo command GENERATE created the coverage, the command JOINITEM added the attributes from tabular files, and then the cover was PROJECTed into the CSD standard Lambert projection.
113 Nebraska Hall
Metadata imported.
Internal feature number.
ESRI
Based on sequence by legal description (Twp-Range-Section-subsection).
CSD
Feature geometry.
ESRI
Area of feature in internal units squared.
ESRI
Perimeter of feature in internal units.
ESRI
State number where pivot resides
CSD
31
CSD
State Number - alpha
Nebraska Department of Natural Resources
1 - 93
Nebraska Department of Natural Resources
Township were pivot resides
CSD
Township, direction
CSD
Range where pivot resides
CSD
Range, direction
CSD
Section where pivot resides
CSD
1 - 36
CSD
Section letter down to an eighth of a section
CSD
A through D
CSD
Years observed
CSD
345678951234567
CSD
Central pivot observed in 1988
CSD
8 was observed, 0 was not observd
CSD
Latitude in decimal degrees
CSD
CSD
Longitude in decimal degrees
CSD
CSD
NRD number where pivot resides
Nebraska Department of Natural Resources
1 - 23
Nebraska Department of Natural Resources
Observed that year?
CSD
Yes or No
CSD
Point locations of observed center pivot irrigation systems.
CSD remote sensing staff have been recording pivots from satellite imagery. This data base is the archive of that effort.
Examination of satellite photos annually were used to correct and update center pivot presence on the ground. The observation depended on 'grass growing in circles'.
CSD
301 Centennial Mall South
P.O. Box 94676
none
Write or FAX with request. Letterhead preferred
Written request, billed as Time & Materials
301 Centennial Mall South
P.O. Box 94676