BUILDING STRONG ® 06/12/202 2 Working Partnership USACE working closely with NOAA (NGS, Office of Coast Survey, and CO-OPS) ► Assistance in Developing Guidance ► Training and Workshops ► Certification Program ► Tools for Connection to NSRS (OPUS-DB, VDATUM) ► Updating Projects
Working Partnership. USACE working closely with NOAA (NGS, Office of Coast Survey, and CO-OPS) Assistance in Developing Guidance Training and Workshops Certification Program Tools for Connection to NSRS (OPUS-DB, VDATUM) Updating Projects. USACE Requirements. Relate all projects to NSRS - PowerPoint PPT Presentation
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BUILDING STRONG®04/22/2023
Working Partnership
USACE working closely with NOAA (NGS, Office of Coast Survey, and CO-OPS)►Assistance in Developing Guidance►Training and Workshops►Certification Program►Tools for Connection to NSRS (OPUS-DB,
VDATUM)►Updating Projects
BUILDING STRONG®04/22/2023
USACE Requirements Relate all projects to NSRS
► Policy in place► Nominal Accuracy Requirements: Hor: 2’, Vert: 0.25’ (relative to
the NSRS, local relative accuracy most likely higher)► All projects have dual elevations: Water Level and Geodetic► Tidal benchmarks tied to NSRS
Need to have published values for NSRS Control► Transformation to current and past values
• Conversion tools a must► OPUS DB essential and OPUS Projects desired
Built Project Control Database► Manage local project control (rely on NGS for connections to
NSRS) Need performance based standards (not just
specifications and procedures)
BUILDING STRONG®04/22/2023
Continued Challenges
Areas of Subsidence and Uplift► Vertical time dependent positioning???
Implementing standards► Establishing Geodetic and Water Level references
Education► Critical to making sure datums are understood
Tidal areas (new datum related to tidal gages) Real Time Networks (connected to NSRS)
BUILDING STRONG®04/22/2023
Guidance Development
Relate all to a Single Nationwide
Reference System (i.e. NSRS)
Developed EC 1110-2-6065/70 (Jul 07) to provide interim guidance on evaluating project datums.
Developed ER 1110-2-8160 on Policy for referencing project elevation grades to nationwide vertical datums
Draft EM 1110-2-6056 on Standards and procedures for referencing project elevation grades to nationwide vertical datums
Draft
BUILDING STRONG®04/22/2023
NSRS ControlProject Primary ControlProject Local Control