(Yield) Maps - StellarSupport - John Deere

JDOffice 1.2
Secondary Nutrients. The secondary plant foods include calcium, magnesium, and sulfur. Less critical elements required
in smaller amounts for plant growth than nitrogen, potassium, and phosphorous.
Selective Availability (SA). The procedure of intentionally introducing error into GPS signals, thereby creating a pseudo
range error. SA is used by the DOD as a national security measure to keep nonmilitary receivers from obtaining highaccuracy
position information.
Semi-Variance. A measure of how much neighboring data points differ in value. Equal to one-half the square of the
difference between two values.
Semi-Variogram. Line fit to the data in a plot of semi-variance versus lag.
Sensory-Based Variable-Rate Application System. A system that adjusts product application rate on-the-go based on
information received from real-time sensors.
Serial Number. The number of your yield mapping system which will uniquely identify the combine from which the data has
been collected.
Serial Port. A connector on a computer that can be used to communicate to other serial devices such as a modem. Serial
refers to the protocol used for the communications (most common is RS-232).
Shadowing. A reduction in the level of light hitting an object.
Site-Specific Crop Management (SSCM). The use of variability of soil and crop parameters to make decisions on the
application of production inputs.
Site-Specific Yield Map. A representation of field crop yields collected on-the-go by a harvester equipped with an
instantaneous yield monitor. Each location/site in a field is assigned a specific crop-yield value.
Soil Color Map. A map that provides information on soil texture and levels of soil organic matter that can indicate
differences in soil patterns within fields.
Soil pH. A numerical measure of the acidity or hydrogen ion concentration in the soil solution.
Soil Testing. Analysis of soil samples to determine chemical and physical properties of interest.
Soil Texture. The physical structure or character of the soil determined by the relative proportions of the soil components
of which it is composed.
Soil Type. A term used to refer to the combination of primary physical constituents of a soil. For example, Glencoe clay
loam, Collinwood silty clay loam, etc.
Space Segment. The portion of GPS consisting of 24 NAVSTAR satellites orbiting the earth at an altitude of 20,200 km.
Spatial Data. See Geographic Data.
Spatial Resolution. The smallest size that can be distinguished by a remote sensing device.
Spatial Variability. Differences in field conditions, such as soil types and nutrient levels, from one location in a field to
another.
Spectral Response. 1) Characteristic patterns of radiation reflected or emitted form an object. 2) The ability of a sensing
system to respond to radiation measurements within a spectral band.
Spectral Resolution. The ability of a sensing system to differentiate between electromagnetic radiation of different
wavelengths.
Speed Sensors. Sensors that measure the rotational speed of a shaft or the reflection of radio or sound waves off the
ground, to determine machine speed.
Spherical Error Probable (SEP). A measure of accuracy of a three-dimensional position estimate produced by a GPS
receiver.
SPOT (Systeme Pour I’Observation de la Terre). Name given to a series of French satellites used to study the Earth’s
surface using remote sensing techniques.
Standard Deviation. A measure of the distribution of measurements around their average. The square root of the sum of
(average-observation) 2 .
Standard Payable Moisture. The moisture level at which the elevator will pay for your crop. Used in conjunction with crop
weight, these numbers are used to calculate the average dry yields and total dry yields.
Standard Positioning System (SPS). The positioning service using a single receiver that is available to any user on a
continuous, worldwide basis. This system uses only the C/A code transmitted via the satellites. The horizontal position
accuracy can be degraded by selective availability.
Start-of-Pass Delay. A delay that allows the initial flow of grain before full flow is achieved to be ignored in yield calculations
when starting a pass.
State Plane Coordinates (SPC). A coordinate system similar to UTM using units of feet and using the NAD27 datum. Each
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