GPS

GPS has increased accuracy as the sampling rate increases. Systems on some cameras sample only once per second (1Hz). Most sample at 10 Hz. Some sample faster. In between samples the latitude and longitude are estimated. This is fine for slow moving sUAS but not as accurate for faster moving sUAS. This is a very important figure, so all sUAS manufacturers and data processors will quote this figure.

GPS is accurate to about 2-4 meters. Accuracy is dependent on atmospheric effects and receiver quality. There are a few methods to improve accuracy. Two common methods are RTK (Real Time Kinematics) and GCP (Ground Control Points). They both depend on hardware locating positions on the ground with high accuracy and adding this to the data.