a roadmap for a seamless elevation surface: benefits to storm surge forecasting lindy dingerson noaa...
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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 TechniquesIssue: 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
