Report of Investigations 9214: Comparison of Aerial and Ground Surveying of Subsidence Over an Active Longwall

Details

• Journal Article:
  MISSING
• Personal Author:
  LaScola, John C.
• Description:
  The Bureau of Mines repeatedly surveyed a grid of monuments over an active longwall mine panel in southwestern Pennsylvania during a 1- yr period. Both conventional ground surveying techniques and photogrammetry were used. The objective of this investigation was to compare elevation measurements of subsidence obtained from aerial and ground survey methods under dynamic ground conditions. The results of a statistical analysis of the survey data show that the mean of the differences between 372 matched pairs of elevation measurments was 0.20 Ft (61 mm) with a 95-pct-confidence interval of 0.05 Ft (15 mm). The mean of the absolute values of the differences was 0.38 Ft (116 mm) with a 95-pct-confidence interval of 0.04 Ft (12 mm). Ninety-five percent of the absolute values of the differences were less than 1.11 Ft (338 mm). [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Source:
  MISSING :12 pages
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  17 pdf pages
• NIOSHTIC Number:
  nn:10006510
• Federal Fiscal Year:
  1988
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:16b83912c0a632ea268832601485dd292f98dcd28d18855f5801d82735934d8e1f0aac65637915327c5baec6f9a3ddb4dc9039086756eb09a9b009938620bcfb
• Download URL:
  https://stacks.cdc.gov/view/cdc/10370/cdc_10370_DS1.pdf
• File Type:
  [PDF - 913.60 KB ]