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

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Presentation transcript:

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

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

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?

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?

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.)

Inventory Supporting Information

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?

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

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.

NOAA Technical Memorandum NOAA/CSC/20718-PUB

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

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?

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

For More Information Lindy Dingerson