Results from one of several tests conducted on the roof of the laboratory to determine elevation measurement errors of the PRO XR system with the Centimeter Option processor are shown below.

Measurements were collected every 5s over approximately 1.5h. The true elevation difference between the two instruments was 0m. Measured differences ranged between +1.9 to -2.5cm. The average difference of the 934 measurements was 0.2cm (STD 1.0cm). It should be noted that most of the deep edge seagrass elevation data were processed using an earlier version of Trimble software that gave larger errors.

The baseline error during these tests was near zero since the two antennas were only separated by less than 1.0m. However, the potential baseline error must be considered during field measurements. The baseline distance should, therefore, be kept as short as possible and not exceed 10km.

Measurements were collected every 5s over approximately 1.5h. The true elevation difference between the two instruments was 0m. Measured differences ranged between +1.9 to -2.5cm. The average difference of the 934 measurements was 0.2cm (STD 1.0cm). It should be noted that most of the deep edge seagrass elevation data were processed using an earlier version of Trimble software that gave larger errors.

The baseline error during these tests was near zero since the two antennas were only separated by less than 1.0m. However, the potential baseline error must be considered during field measurements. The baseline distance should, therefore, be kept as short as possible and not exceed 10km.