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Table 1 Quality Groups of Utility Location Data

From: Uncertainty-aware visualization and proximity monitoring in urban excavation: a geospatial augmented reality approach

Quality groups Data lineage
A Precise horizontal and vertical location obtained by actual exposure and measurement.
B Location information obtained through the application of surface geophysical methods
C Location information obtained by inferring from above-ground utility features.
D Location information derived from existing records or oral recollections.