The above illustration the irrigation system in its entirety - almost. All the data has been collected in the field using the GPS unit from yesterday’s image. The data has been post processed – [the unit collects data from several satellites as items are measured. Afterwards data can also be collected from a regional data collector to further refine the errors. The geometry of the satellites has a big part of the accuracy and using a regional beacon adds to the accuracy.] I then compile the new measurements – recording during construction requires many individual days of measurement – to the image you see above.
There are a few more heads still out there, but thankfully not many.
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