Fig. 5

Prediction plot for the static tests A number of satellites, B HDOP values, C GPS precision errors, and D GPS accuracy errors in relation to the sky-view for closed (purple line and ribbon) and open (green line and ribbon) canopy cover. The gray points are the original observations, with HDOP values > 1.25 and GPS errors > 20 m excluded to improve readability (total observations: n = 8466, HDOP: n = 8453, precision error: n = 8461, accuracy error: n = 8458)