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Table 3 GNSS system parameters, survey conditions and control points

From: Airborne lidar-based estimates of tropical forest structure in complex terrain: opportunities and trade-offs for REDD+

Parameter Specification
GNSS system Topcon HiPer L1/L2 receiver
Horizontal accuracy 3 mm + 0.5 PPM
Vertical accuracy 5 mm + 0.5 PPM
System frequency 20 Hz
Linear units meters
Angular units degrees
Datum WGS84
Projection UTM Zone 23 South
Geoid MAPGEO 2010
Base Reference Point INCRA “ABE M0693”
Number of points measured with success 35 (out of 36 total)
Points with σ < 1 m (x,y,z) 30
Points with 1 ≤ σ < 2.2 m (x/y/z) 5
Accuracy (RMSE) Easting 0.006 - 2.130 m; mean = 0.473 m
Accuracy (RMSE) Northing 0.006 - 1.876 m; mean = 0.225 m
Accuracy (RMSE) Elevation 0.019 - 2.195 m; mean = 0.469 m