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A Roadmap for a Seamless Elevation Surface: Benefits to Storm Surge Forecasting

This roadmap explores the benefits of high-resolution elevation data for more accurate storm surge forecasts. It answers questions about topography and bathymetry data availability, techniques to create a uniform reference, and applications of seamless topobathy models.

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A Roadmap for a Seamless Elevation Surface: Benefits to Storm Surge Forecasting

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  1. A Roadmap for a Seamless Elevation Surface:Benefits to Storm Surge Forecasting Lindy Dingerson NOAA Coastal Services Center

  2. Importance of Topobathy DEMs • High-resolution elevation data contributes to making more accurate storm surge forecasts

  3. A Roadmap to a Seamless Elevation Surface • Seeks to answer the questions: • What is the “best available” topography and bathymetry data and where can I find it? • What are the techniques available to create a uniform reference and integrate data? • What can I do with a seamless topobathy model based on high-resolution data sets?

  4. A Roadmap to a Seamless Elevation Surface • Seeks to answer the questions: • What is the “best available” topography and bathymetry data and where can I find it? • What are the techniques available to create a uniform reference and integrate data? • What can I do with a seamless topobathy model based on high-resolution data sets?

  5. Data Inventory: Gulf of Mexico • On-line inventory of publically-available topography and bathymetry data sets in the Gulf of Mexico (time stamp as of November 15, 2007) • Focused on high-resolution elevation data sets • Two sets of maps • Data Gap Analysis by Location • Data Gap Analysis by Collection Date • Accompanied by supporting information including descriptions of collections, where to access data, and topographic lidar attributes (datums, accuracies, etc.)

  6. Inventory Supporting Information

  7. A Roadmap to a Seamless Elevation Surface • Seeks to answer the questions: • What is the “best available” topography and bathymetry data and where can I find it? • What are the techniques available to create a uniform reference and integrate data? • What can I do with a seamless topobathy model based on high-resolution data sets?

  8. Why Do We Care about Reference? • Creating a common reference for all data sets allows you to minimize error in the final DEM. • The Issue: • Topo and bathy referenced to different datums Santa Rosa, FL; courtesy of CSDL

  9. Datum Conversion Techniques • Issue:Accurately converting between tidal and orthometric/ellipsoidal datums • VDatum – estimates tidal datums using a complex hydrodynamic model and tidal benchmark data • Harmonic Constant Datum Method – estimates tidal datums using major tidal influences (sun, moon, rotation of earth) and tidal benchmark data • Linear Interpolation – estimates tidal datums using tidal observations at benchmarks and interpolating between tide stations • No Conversion – no relationship between datums is established. Therefore, datums are assumed to be equal.

  10. NOAA Technical Memorandum NOAA/CSC/20718-PUB

  11. Myrtle Beach, SC: 1/3 arc second (10m) grid courtesy of NGDC Data Integration

  12. A Roadmap to a Seamless Elevation Surface • Seeks to answer the questions: • What is the “best available” topography and bathymetry data and where can I find it? • What are the techniques available to create a uniform reference and integrate data? • What can I do with a seamless topobathy model based on high-resolution data sets?

  13. DEM Applications • Coming soon: on-line reference addressing topobathy DEM applications and general data and DEM standards necessary for some coastal applications • Addressing topobathy applications such as • Coastal Flooding • Shoreline Delineation • Erosion Monitoring • Sea Level Rise • Habitat Mapping

  14. For More Information • www.csc.noaa.gov/topobathy • Lindy Dingerson • Lynne.Dingerson@noaa.gov

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