| Multi-Piece, Digital Barcode Level Staff Instrumentation Evaluation Report - :18102 | National Ocean Service (NOS)
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Multi-Piece, Digital Barcode Level Staff Instrumentation Evaluation Report
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  • Description:
    NOAA’s National Geodetic Survey developed evaluation procedures for detecting the extent of degradation of the measurement accuracy and precision of bifurcating barcodes; in particular, multi-piece non-Invar barcode leveling staffs. Data collection procedures consisted of both laboratory and field tests. Laboratory tests focused on variations between a compared standard - a calibrated single piece Invar barcode leveling staff - against several non-Invar multi-piece staffs. Field tests along a steep grade forced measurements across staff sections to detect the systematic error induced by staff bifurcation. The multi-piece staffs exhibited a combination of scale and index error ranging in magnitude from 0.5 mm to 1.1 mm under laboratory conditions. In the field, these errors were as high as 1.5 mm per setup and up to 7 mm for the entire 180- meter section. The three staffs tested produced varying results based upon their multi-piece construction. These results support the Federal Geodetic Control Subcommittee specifications for geodetic control leveling, requiring the use of one-piece, calibrated staffs.

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