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Overview of 2010 Geospatial Summit

This overview of the 2010 Geospatial Summit, presented by Juliana P. Blackwell, Director of the National Geodetic Survey at NOAA, highlights key lessons learned from the past and discusses the modernization of the National Spatial Reference System (NSRS). Topics covered include the replacement of the Geopotential Datum and Geometric Datum, challenges faced in modernizing the NSRS, and feedback from end users. The importance of communication, geodetic expertise, and developing support tools in advance is emphasized. The destruction of marks and lack of continent-wide consistency in the North American Vertical Datum of 1988 (NAVD 88) are addressed, along with the misalignment issues of the North American Datum of 1983 (NAD 83). The future direction of the NSRS, including the role of passive marks and CORS, is also discussed. The session concludes with feedback from users, highlighting the need for fixed coordinates and the importance of traceability and consistency in geospatial data. The presentation conveys cautious optimism for the future and acknowledges the slow adoption of time-dependent coordinates.

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Overview of 2010 Geospatial Summit

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  1. Overview of 2010 Geospatial Summit Juliana P. Blackwell Director, National Geodetic Survey National Ocean Service, NOAA Geospatial Summit, April 13-14, 2015

  2. Highlights Lessons from the Past Modernizing the National Spatial Reference System (NSRS) Geopotential Datum – Replacing NAVD 88 Geometric Datum – Replacing NAD 83 Perspectives and Feedback 2

  3. Lessons from the Past Expect years of effort Requires a lot of geodetic expertise Expect slow-adopters and no-adopters Users care about differentialaccuracy more than absolute Communicate, communicate, communicate Develop support tools in advance 3

  4. North American Vertical Datum of 1988 (NAVD 88) Destroyed marks, poor locations, no monitoring, bias, tilt No continent-wide consistency Re-leveling is expensive, doesn’t solve root issues Future: GPS+Geoid! Role of passive marks demoted North American Datum of 1983 (NAD 83) Non-geocentric, misaligned with satellite orbits Legally binding in 48 states! Built from Bilby passive to GPS passive to CORS Too many “realizations” Future: CORS rules! Role of passive marks demoted Future: Plate-fixed? Remains an open question Modernizing the NSRS 4

  5. Perspectives and Feedback Panel Q&A and End User Feedback Many users desired some form of “fixed” coordinates Need for passive control varies from “none” to “critical” Volume of federal NAD 83/NAVD 88 geospatial data is tremendous, but almost all digital or becoming digital Traceability back to NAD 83 or NAVD 88 very important Consistency of the NSRS across decades is important Summary Cautious optimism and some excitement Adoption of true time-dependent coordinates will be slow, but some users need this information. 5

  6. Thank you 6

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