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Feedback on the New Datums

Discussion on the impact, advantages, and challenges of the new datums for the US Army Corps of Engineers and their products and services. Preparation, advantages, challenges, transition tools, and outreach needs are covered.

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Feedback on the New Datums

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  1. Feedback on the New Datums US Army Corps of Engineers Jim Garster 2017 Geospatial Summit April 24 to 25, 2017

  2. Preparation • Our major products/services which will be affected by the new datums: • Existing project maps; designs; studies; • Project O&M Manuals • Sea Level Change tools • Our preparations to date include: • Policy and Guidance documents (ER 1110-2-8160 and EM 1110-2-6056) project vertical datums • Workshops, Webinars, Newsletters • U-SMART (USACE Survey Monument Archival & Retrieval Tool) Keeps track of project control and ties to NSRS/NWLON • http://usmart.usace.army.mil US Army Corps of Engineers

  3. Advantages / Challenges • We are excited because...Expected advantages of the new datums for your organization, its products, or services • Consistency of datums across the country, specifically vertical • Better relationship between geodetic and hydrologic datums • Improved accuracy for GPS derived elevations (via Geoid models) • We are concerned because...Expected challenges of the new datums for your organization, its products, or services • Relationship between exiting/older datums and new datum • Relationship between new vertical datums and tidal datums • Impact to State Plane Coordinate projections • Small changes might get ignored • Potential dynamic datum • Constantly changing coordinates • How often will it change? • Conversion tools more complex US Army Corps of Engineers

  4. Transition Tools / Outreach Needs • The tools, products, or services we need most (from NGS or others) are: • NGS should publish transformation routines/tools • Need to include accuracy • User defined epoch for output datasheet • Incorporation of transformations in GIS tools (i.e ESRI, …) • Superseded values need to be documented on datasheets • OPUS Projects, connections to the NSRS • The outreach we need most (from NGS or others): • NGS should develop on-line tutorials on datums and importance of datum transformations. • Publication which describes and documents the differences between NAD83/NAVD88 and the new datums US Army Corps of Engineers

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