working partnership
DESCRIPTION
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 PresentationTRANSCRIPT
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
THE HISTORIC OR LEGACY REFERENCE NETWORK
WILL NOT CHANGE OR BE ELIMINATED. THIS
PROCESS JUST RELATES YOUR NETWORK TO THE
NATIONAL SPATIAL REFERENCE SYSTEM
This tie is easily accomplished with GPS and
OPUS-DB