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Feedback on the New Datums

Feedback on the New Datums. Federal Emergency Management Agency Kimberly Pettit Prepared with Paul Rooney. 2017 Geospatial Summit April 24 to 25, 2017. Preparation. Our major products/services which will be affected by the new datums :

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Feedback on the New Datums

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  1. Feedback on the New Datums Federal Emergency Management Agency Kimberly Pettit Prepared with Paul Rooney 2017 Geospatial Summit April 24 to 25, 2017

  2. Preparation • Our major products/services which will be affected by the new datums: • National Flood Insurance Program (NFIP) Flood Maps • NFIP insures about $1.3 Trillion in property in high risk areas • To be eligible, communities must agree to minimum building standards and integrate hazards into land use codes • Property owners must purchase insurance to be eligible for various federal programs and most conventional mortgages • To implement these requirements FEMA publishes flood maps that define: • The boundaries of the high risk area (horizontal) • The elevations to which buildings must be built in the high risk area (vertical) • Depends on good data, particularly accurate elevations • Move toward structure-specific risk rating requires more accurate measures • Our preparations to date include: • Currently working on transition from NAD83 (1986) to NAD83 (2011) • Developing dynamic digital data delivery requirements and expanding legal compliancy standards for digital data

  3. Advantages / Challenges • We are excited because...NFIP Implementation • New construction permits, real estate transactions, and flood insurance need determination of flood risk status and minimum building elevation. Improvements could reduce surveying costs for thousands of precise horizontal and vertical measurements referenced to NSRS • Mapping clarity and accuracy • Communities attach a copy of the map to their ordinance as the official record • Name change will bring clarity to all map products (currently just NAD 83) • We are concerned because...Changing the datum on maps requires administrative actions by communities • Once the boundaries and elevations are published by FEMA they are fixed administratively and enforced by Federal, state and local laws • Legal issues arise when conversions introduce small shifts in relative positions • Large revisions by FEMA, communities, property owners can take 3-5 years + • Dynamic nature of the Earth and corresponding dynamic datums make future legal considerations and procedures difficult with integrated datasets

  4. Transition Tools / Outreach Needs • The tools, products, or services we need most (from NGS or others) are: • The ability to convert between datums (and datum realizations) • The National Flood Hazard Layer is a large (several gigabyte) GIS dataset of 20+ layers covering CONUS, AK, HI, PR, CNMI, Guam • The NFHL is currently in NAD 83 (1986) • New NGS tools only convert points. • FIRM DB come in many realizations of NAD 83 without good metadata • Commercial vendors using the new NGS tools to create an integrated conversion toolkit may be a good solution? Esri, FME, etc. • The outreach we need most (from NGS or others): • Most NFIP end users are unlikely to benefit from training • Guidance documents, quantitative conversion analyses, and conversion tools are crucial

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