dynamic digital elevation model ddem nsf rii track 2 annual meeting may 29, 2012
TRANSCRIPT
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Dynamic Digital Elevation ModelDDEM
NSF RII Track 2 Annual Meeting
May 29, 2012
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What is a DDEM
• model grid for all of the catchment to coast modeling experiments
• must be accurate and dynamic• dynamic nature means that it must support a
wide range of model parameters and retain accuracy
• must include the most recent additions of land surface elevation and bathymetry data
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DDEM Requirements from Modelers
• Seamless terrain model from 20 meters above MSL to 200 meters below MSF
• X,Y,Z format in geographic coordinates• Zip file format• Bathymetry values expressed as negative• NAVD88 vertical datum• Resolution defined by user during extraction
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Access and UseRequirements from Modelers
• System to extract data from server, linked through NG-CHC collaborative environment
• Extraction system– User selected Area of Interest (AOI)– Different data set characteristics displayed– User selected resolution– NO ‘smoothing’ of data– FTP download
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Access and UseRequirements from Modelers
• Modelers can upload new data for incorporation into DDEM– Footprint of new data retain– Data is deleted– Upload limits being determined
• Differences between new and old data calculated and display to user
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Deliverables – Year #2
• DDEM for Mississippi and Alabama– Documentation of procedures, issues and
solutions– Plan for creation of DDEM for MS-AL-LA
• System to extract selected areas of DDEM for use in models– Available for testing in MS & AL– Optimization methods being investigated
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Creating the DDEM for MS & AL
•Download the data from online data sources
•Mosaic data into larger sections
•Trim the land-based data to the coastline
•Clip high resolution data to the county level
•Create footprint file showing data coverage of differing resolutions
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Coastline-trimmed 1/3 arc sec. NED data
overlaying 1/3 arc sec. NOAA VDatum DEM
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Harrison County, MS 1/9 arc sec. NED data
shoreline-trimmed and clipped to the
county level
The red line represents the
footprint of the DEM data
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Footprint representing areal
extent of three resolutions of data
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Approximate area of anticipated data
coverage for northern Gulf Coast
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Next Steps – Year 3
• Complete development of DDEM for entire study area
• Need more detailed information from simulation experiments– s