20 Glossary O
Normalized Difference Vegetative Index. Commonly used to measure plant health and vigor. NDVI =
(NIR_reflected Red_reflected)/(NIR_reflected + Red_reflected).
NMEA standard
An electrical, hardware and data standard designed by the National Marine Electronics Association
that dictates the content and format of communication between GPS receivers and other devices.
NMEAmessages include data that provides location and accuracy, the number of satellites being
used, the dilution of precision and signal strength.
NEU
Nitrogen Use Efficiency. A percentage of nitrogen taken up by the plant. For example, an NUE of 60%
means that 6 lbs. of nitrogen fertilizer is expected to be used by the plant that year for every 10 lbs.
applied. For more information, visit www.nue.okstate.edu.
NRS
Nitrogen Rich Strip. An area for determining the amount of nitrogen being made available to the
plant by the environment (mineralization, etc), and importantly this year's expected maximum yield
potential and response to additional nitrogen.
O
OEMmoisture sensor
Moisture sensor installed by the combine manufacturer.
Offset
Difference between design height and target height. By using the offset buttons, you can create a
plane that is parallel to the original design.
P
Parity
When used with a serial port, an extra data bit is sent with each data character to detect errors in
transmission.
PDOP
Position Dilution of Precision. A calculation that takes into account the satellites that can be seen,
how high they are and their bearing. The outcome of the calculation is an estimation of how prone
to error your GPS position is. The lower the value, the more accurate your position. You may wish to
plan your field work for periods of low PDOP. Generally, the more satellites in view, the better
(lower) the PDOP.
Pivot
A guidance pattern you define for your field by recording the outer circular boundary of the pivot
area and then entering a value to compute the rows within the pivot. Guidance patterns are for use
with automated steering.
Version 9.25, Revision B FM-1000 Integrated Display User Guide 521
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