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Feedback on the New Datums
2015 Geospatial SummitApril 13 to 14, 2015
US Army Corps of EngineersJim Garster
Our major products/services which will be affected by the new datums:•Existing project maps; designs; studies•Project O&M Manuals
Our preparations to date include:• Engineer Regulation (ER 1110-2-8160) Policy on project
vertical datums• Engineer Manual (EM 1110-2-6056) Guidance referencing
project datums• U-SMART (USACE Survey Monument Archival & Retrieval
Tool) Keeps track of project control and ties to NSRS/NWLON
http://usmart.usace.army.mil
Preparation
US Army Corps of Engineers
We are excited because...Expected advantages of the new datums for your organization, its products, or services
• Consistency of vertical datums across the country• Better relationship between geodetic and hydrologic datums• Improved accuracy for GPS derived elevations
We are concerned because...Expected challenges of the new datums for your organization, its products, or services
• Another vertical datum…• Relationship between exiting/older datums and new datum• Small changes might get ignored• Potential dynamic datum
• Constantly changing coordinates• Conversion tools more complex
Advantages / Challenges
US Army Corps of Engineers
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• Command line application for transformations
• Superseded values need to be documented• OPUS, connections to the NSRS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 the differences between
NAD83/NAVD88 and the new datums
Transition Tools / Outreach Needs
US Army Corps of Engineers
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