Updated Survey Standards and Control Guidance for Improved Operations

Details

• Creators:
  Simpson, Chase ; Kim, Su-Kyung ; Park, Jihye
• Corporate Creators:
  Oregon State University
• Corporate Contributors:
  Oregon. Dept. of Transportation. Research Section ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Data Files Geodetic Surveying Standards Surveying Methods And Processes Project SPR 304-821
• Publication/ Report Number:
  FHWA-OR-RD-21-14
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Section
• Abstract:
  Two control survey networks, observed via a traditional survey campaign and NRTK surveying campaign, were established at two independent study areas. To assess the performance of different surveying scenarios, a least squares adjustment was applied to all available traditional survey and NRTK data to create a reference dataset for each project site. Key findings: 1) When four 5-minute independent NRTK observations are made per point and the resulting baselines are adjusted using the Hybrid Network Methodology, a network accuracy of 1.8 cm in the vertical and 1.0 cm in the horizontal at a 95% confidence level is achievable. 2) Two hours between repeat observations is recommended to achieve fully independent solutions. 3) Total station (TS) observations improve overall horizontal accuracy of the network. 4) If vertical accuracies less than 1.8 cm at a 95% confidence level are required, then differential leveling should be performed. 5) When TS and differential leveling survey is required, not all stations need to be occupied with NRTK. 6) When NRTK observations are suitable for a project, static GNSS may not be required. 7) It is not recommended to hold the RTN published coordinates as a constraint in the adjustment. 8) It is recommended that RTN network managers ensure the published coordinates for the RTN base stations align with the NSRS. 9) Observing control stations with NRTK removes the requirement of having a minimum of 2 GNSS receivers observing points simultaneously.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0b65f769e91851180ecb5fe7d352478a01717c91d4f09c2ccf92fc8a1663739426fb91bda0f453e4251a3055ddab747f71d05dc05c9f8ee75f1e3bb33029b500
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/55990/dot_55990_DS1.pdf
• File Type:
  [PDF - 9.46 MB ]