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Texas Height Modernization

This presentation from April 2014 outlines recent height modernization efforts in Texas and Florida, emphasizing GPS precise network observations along the Gulf Coast. Dr. Gary Jeffress from the Texas Spatial Reference Center discusses significant projects funded by the US Army Corps of Engineers, highlighting the necessity of accurate elevation data for effective disaster response and flood management. The presentation also addresses the alarming loss of benchmarks and their impact on flood safety, using examples from Galveston Bay to illustrate the importance of updated elevation measures.

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Texas Height Modernization

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Presentation Transcript

  1. National Height Modernization Partner Meeting NOAA Gulf of Mexico Disaster Response Center Mobile, Alabama – April 2014 Texas Height Modernization Dr. Gary Jeffress, RPLS Texas Spatial Reference Center

  2. Recent Projects • 2012-2013 GPS Precise Network Observations Along the Texas Gulf Coast • TCOON Tide gauge Benchmarks • Historic USACE tidal benchmarks • Texas CORS • GPS-able NGS first & second order Benchmarks • A total of 72 network sessions and 153 stations observed (Adjust and Pages) • All stations Bluebooked • Funded by US Army Corps of Engineers

  3. 2012-2013 GPS Precise Network Observations Along the Texas Gulf Coast

  4. 2013-2014 GPS Precise Network Observations Along the Florida Gulf Coast

  5. CORS on Tide Gauges Florida Pensacola, FL

  6. CORS on Tide Gauges Florida Fernandina, FL

  7. CORS on Tide Gauges Florida St. Petersburg, FL

  8. CORS on Tide Gauges Florida Cedar Key, FL

  9. CORS on Tide Gauges Texas Existing CORS 4 (USACE 2, NERRS 1, USFW 1) Proposed Sentinel CORS 4 (USFW) Proposed Height Mod. CORS 5 TOTAL 13 Sentinel

  10. The need for accurate Elevation in Texas Austin, 1991 Houston, 2001 Lives are lost and $Billions of property are lost.

  11. National Flood Statistics (2001) From http://floodsafety.com/national/life/statistics.htm

  12. Licensed Surveyor’s Role

  13. Why are Elevations so bad? Answer: The data are old and subject to change and destruction. Up to 80% of these benchmarks have disappeared

  14. Why are Elevations Important?An Example from Galveston Bay, Texas

  15. An Example from Galveston Bay, Texas From Google Street View

  16. An Example from Galveston Bay, Texas From Google Maps X

  17. An Example from Galveston Bay, Texas X

  18. An Example from Galveston Bay, Texas X X

  19. An Example from Galveston Bay, Texas

  20. An Example from Galveston Bay, Texas FF = Finished Floor Level FF = 13.86 feet FIRM September 1999 Zone AE EL 12 = 12.00 feet FIRM September 2012 Zone AE EL 15 = 15.00 feet

  21. An Example from Galveston Bay, Texas Surveyor’s Elevation Datum

  22. Flood Insurance Quote

  23. For Sale $1,028,697 ?

  24. Thank you for listening. gary.jeffress@tamucc.edu

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