We used a separate ground reference screw for the left and right hemisphere.
A ground reference was undertaken with the same biological setup with a delay of 4 d.
The study area, in north-eastern European Russia, was visited in July 2007 to obtain ground reference data.
Ground reference points in legged locomotion: Definitions, biological trajectories and control implications, International Journal of Robotics Research, vol. 24, no. 10, pp. 1013-1032, 2005.
The simplest form of flight control is called the visual flight rule, in which pilots fly with visual ground reference and a "see and be seen" flight rule.
Each photograph is scaled, using marked and known ground reference points; thus, a mosaic can be constructed that may include thousands of photographs.
The chemical and physical data for the aquatic system were within the expected range and were closely comparable in comparison to the ground reference.
A potentially important difference in the flight experiment, compared with ground reference studies, was the presence of a high level of atmospheric ethylene (1,200 ppb).
The newly constructed DEM 7 achieves highest accuracy with the least average elevation difference of 0.27 m calculated using 46 ground reference points.
The results of IS extraction compared with the ground reference data indicated the overall accuracies and Kappa coefficients generally higher than 86.1% and 0.72, in all cases.
Variation exists in which MODIS datasets are used, how they are processed for analysis, and what ground reference data are used.
