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Cedar Rapids, Iowa | What you mean by 'accuracy' really depends on what task you're doing.
For example, a tile plow requires very good vertical data, but the time scale is only hours. You don't care about having the base surveyed into a national grid. This is why a portable base on a tripod in the field with your tile plow is so popular.
However, if you're a land surveyor, you absolutely need your base surveyed into a state or national grid, plus you'll still probably grab points at a local survey monument just to double-check your reference. In this scenario, a surveyor would prefer a CORS network with surveyed bases that are 10 miles away over a portable base that hasn't been surveyed. Well, unless there is a local survey monument that they can reference with the rover to get all the other data points in sync. Again, it depends on the job. One luxury the surveyors have is using a rover that you hold still for a few seconds while it grabs 100 data points, discards the outliers, and averages the rest.
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Networked RTK (Digifarm, CORS, etc) vs base station in your field
