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Longwall Mining Subsidence Surveying: An Engineering Technology Comparison.

Authors
Lascola-JC; Trevits-MA
Source
Proc 5th Int'l Fig Symp Deformation Measurements & 5th Can Symp Univ NB 1988 :298-307
Link
NIOSHTIC No.
10007040
Abstract
This U.S. Bureau of Mines investigation evaluates and compares conventional and high-technology geodetic surveying systems using a survey grid installed over stable ground with physical characteristics typical of current longwall mine subsidence study sites. The positions of 145 monuments along the grid were measured during a 1-month period by electronic distance meter-theodolite- levels (edm-theodolite), an automatic recording infrared laser tachymeter, a satellite-based global positioning system, aerial photography (photogrammetry), and a prototype inertial surveyor. Statistical analysis indicates that the average three-dimensional displacements from the base (edm-theodolite) for both the tachymeter and photogrammetry were within 0.25 Ft (0.076 M).
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 92-89
NIOSH Division
PRC;
Source Name
Proc 5th Int'l (Fig) Symp. Deformation Measurements & 5th Can Symp; Univ NB, 1988, PP. 298-307
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