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Working Partnership

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

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Working Partnership

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  1. 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

  2. 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)

  3. 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)

  4. Guidance Development Draft Developed EC 1110-2-6065/70 (Jul 07) to provide interim guidance on evaluating project datums. Draft EM 1110-2-6056 on Standards and procedures for referencing project elevation grades to nationwide vertical datums Relate all to a Single Nationwide Reference System (i.e. NSRS) Developed ER 1110-2-8160 on Policy for referencing project elevation grades to nationwide vertical datums

  5. Project Primary Control Project Local Control The NSRS provides that common reference Flood Insurance Rate Maps Adjacent Projects HEC Models This tie is easily accomplished with GPS and OPUS-DB THE HISTORIC OR LEGACY REFERENCE NETWORK WILL NOT CHANGE OR BE ELIMINATED. THIS PROCESS JUST RELATES YOUR NETWORK TO THE NATIONAL SPATIAL REFERENCE SYSTEM LiDAR Datasets NSRS Control Legacy Control Wil Not Change

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