![]() HOW AN RTK AIRCRAFT DETERMINES POSITION with NTRIP: HOW AN RTK-CAPABLE AIRCRAFT CAPTURES POSITION with a BASE STATION: HOW A NON-RTK AIRCRAFT CAPTURES AERIAL POSITION: When this data is imported into a processing software such as Pix4DMapper, Leica Infinity, 3DR, etc, the data becomes “localized” and if all parameters are properly set, the localized data, in the form of an ortho, become measurable with a great degree of accuracy. These corrections, received during the flight, are written to the image metadata contained in each photo the aircraft captures. This allows the aircraft to know with much greater precision, where it sits in XYZ space as referenced to the ground locations. Construction surveys allow for a greater slide in precision vs land survey and this too is important to understand, while going beyond the scope of this article.Īn RTK aircraft receives “corrections” from a known grid system, via a couple of different technologies. Surveying creates an ortho-corrected, localized image or drawing of a ground area which contains measurable data with a highly accurate and precise measurability. The accuracy of measurements is affected by several factors, such as altitude of flight (ground sampling distance), size of image sensor, curvature of lens, latency of shutter to antenna, and other factors. Mapping with a UA system, creates a flattened, “localized” image of a ground area, that contains measurable data with some degree of measurability. How does this all work then? Why is it important?įirst, let’s define the differences between “Mapping” and “Surveying.” At a recent conference for example, a presenter claimed that with their dual RTK aircraft, they are capable of repeatable precision (accuracy) of less than 1/1000. Why does this matter? When discussing UA, it’s critical to know the level of precision the aircraft and accompanying system will provide. In AEC (Architecture, Engineering, Construction), an acceptable accuracy falls into “tenths” while Surveyors work in hundredths or thousandths.
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