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Feedback on the New Datums

Explore how the new datums will impact Fairfax County GIS mapping services and surveying practices, highlighting benefits, challenges, and required tools for transition. Learn about preparation efforts, coordination with neighboring jurisdictions, and outreach needs for successful implementation.

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Feedback on the New Datums

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  1. Feedback on the New Datums Fairfax County Government, Department of Public Works and Environmental Services, Land Survey Branch Vickie McEntire Anglin, L.S. County Surveyor 2017 Geospatial Summit April 24 to 25, 2017

  2. Preparation • Our major products/services which will be affected by the new datums: • All County GIS mapping services, especially topographic maps • Values on all Secondary Control Monuments • FIRM and DFIRM for Fairfax County, elevation certificates • Our preparations to date include: • Personally, got Director’s backing of my activities at state level and county level to accept leadership role in this change • Started discussions at leadership level to pre-sell budget items • Held meetings with GIS to discuss plan to handle change within the county • Identified those stakeholders with legacy data • Identified County Code and checklists to change

  3. Advantages • We are excited because... • Fairfax County will switch to NSRS 2022 and be set for the future • new datum will be slightly more accurate • facilitate closer coordination with neighboring jurisdictions on floodplain mapping issues after all maps are in common.

  4. Challenges • We are concerned because... • This is an unfunded mandate; we need $$$ from DMB and BOS for changing something which is virtually invisible, difficult to fully explain in lay terms, and is currently working well; effort and costs unknown • County code, checklists, and processes must change to reflect NSRS2022 • A complex web of internal users have legacy data that is not digital and will require conversion on demand or wholesale. • Resources to transform heights from NGVD 29 to NAVD 88 to NSRS 2022 are not funded/not available • Staff education and outreach across many agencies has to be designed and administered in continuing education format. • FEMA FIRM Maps for Fairfax (2010) and county official datum out of sync: Maps in NGVD 1929 v/s 2022 for general county.

  5. Transition Tools • The tools, products, or services we need most (from NGS or others) are: • NGS transformation tools to facilitate on demand conversions • GIS, GPS, CAD, and add on computing software packages need to incorporate the function for conversions between datums and handle the 5 parametersX,Y,Z,t,v • Solution to surveying on a single project over a long period – what do we do with coordinate values that are changing?

  6. Outreach Needs • The outreach we need most (from NGS or others): • Monthly webinars will be helpful. Continue the ‘whitepages’ style updates (NSRS Modernization News) • NSPS can help agencies accomplish outreach with a standard “speakers kit” including practical benefits along with the sample language to update state legislation that references NAD 83 • Explanations of : • the benefits of doing this in Fairfax • how NGS perceives this impacting the county • financial assistance options • the process of changing and the tools that will be necessary

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