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Precision Services

Yield Mapping

Yield maps are one of the MOST VALUEABLE sources of spatial data for precision agriculture! Yield mapping has been around since the 1990’s when GPS data was first coupled with different sensors on the harvester to be able to measure and map parameters such as crop yield, moisture, speed, elevation and much more.


  • Decrease fuel costs by reducing unauthorized vehicle use, curbing excessive speeding and lowering idling
  • Easily identify activity that causes excessive carbon emissions
  • Reduce repair costs through proactive engine monitoring and maintenance
  • Increase operator performance by monitoring productivity and delays

During harvest, you can accurately view, map, and record crop yield and moisture data in real-time to instantly understand how well your crop performed. See which Trimble displays can help. 

Why yield map?

Know your dollars and cents

The yield data collected produces what is know as a yield map, these can be used to compare the yield distribution within the field, and once we have more than three years of data we can compare yield distribution from year to year.  This allows the farmer to determine areas of the field which are under-performing or over-performing. Further investigation can be done to determine the cause, then management decisions can be made for improvements the following year.  Using yield mapping we can produce profit maps and nutrient off-take maps from within each field.  We can analyse how different field management strategies affect the yield,  we can apply fertiliser more accurately according to the nutrients removed and have improved decision making and budgeting for future years.

The basic components of a yield mapping system include:

  • Grain flow sensor – determines grain volume harvested
  • Grain moisture sensor – compensates for grain moisture variability
  • Clean grain elevator speed sensor – used by some mapping systems to improve accuracy of grain flow measurements
  • GPS antenna – receives satellite signal
  • Yield monitor display with a GPS receiver (to geo-reference and record data)
    Header position sensor – distinguishes measurements logged during turns
  • Travel speed sensor – determines the distance the combine travels during a certain logging interval.
  • Engine performance data can also be recorded in some systems.

yield map uses

Yield maps can be used for a variety of reasons, however all uses require QUALITY yield data. Some of the uses of yield data are as follows:

  1. Normalise yield data– define consistent management zones using multiple years of yield data
  2. Create gross and net profit maps– for learning how to fine tune inputs to maximise profitability in all areas of the field.
  3. Calculate nutrient removalby the crop and thus the amount that needs to be replaced in these areas. 
  4. Comparisons with EM survey data, satellite imagery, drone imagery.
  5. On farm trials of different inputs, rates or management systems to see if their effects carry through to a yield effect.

Other costs can also be compared and mapped depending on your systems setup, such as fuel performance, work rates

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