Texas Height Modernization Dr. Gary Jeffress, RPLS Texas Spatial Reference Center National Height...
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Transcript of Texas Height Modernization Dr. Gary Jeffress, RPLS Texas Spatial Reference Center National Height...
![Page 1: Texas Height Modernization Dr. Gary Jeffress, RPLS Texas Spatial Reference Center National Height Modernization Partner Meeting NOAA Gulf of Mexico Disaster.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697bf731a28abf838c7f39b/html5/thumbnails/1.jpg)
Texas Height Modernization
Dr. Gary Jeffress, RPLSTexas Spatial Reference Center
National Height Modernization Partner MeetingNOAA Gulf of Mexico Disaster Response Center
Mobile, Alabama – April 2014
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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
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2012-2013 GPS Precise Network Observations Along the Texas Gulf Coast
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2013-2014 GPS Precise Network ObservationsAlong the Florida Gulf Coast
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CORS on Tide Gauges Florida
Pensacola, FL
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CORS on Tide Gauges Florida
Fernandina, FL
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CORS on Tide Gauges Florida
St. Petersburg, FL
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CORS on Tide Gauges Florida
Cedar Key, FL
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CORS on Tide Gauges TexasExisting CORS 4
(USACE 2,NERRS 1,USFW 1)Proposed
Sentinel CORS 4(USFW)
Proposed Height Mod.
CORS 5TOTAL 13
Sentinel
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The need for accurate Elevation in Texas
Austin, 1991Houston, 2001
Lives are lost and $Billions of property are lost.
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National Flood Statistics (2001)From http://floodsafety.com/national/life/statistics.htm
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Licensed Surveyor’s Role
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13Up to 80% of these benchmarks have disappeared
Answer: The data are old and subject to change and destruction.
Why are Elevations so bad?
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Why are Elevations Important?An Example from Galveston Bay, Texas
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An Example from Galveston Bay, TexasFrom Google Street View
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An Example from Galveston Bay, Texas
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From Google Maps
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An Example from Galveston Bay, Texas
X
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An Example from Galveston Bay, Texas
X
X
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An Example from Galveston Bay, Texas
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An Example from Galveston Bay, Texas
FF = Finished Floor LevelFF = 13.86 feet
FIRM September 1999Zone AE EL 12 = 12.00 feet
FIRM September 2012Zone AE EL 15 = 15.00 feet
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An Example from Galveston Bay, Texas
Surveyor’s Elevation Datum
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Flood Insurance Quote
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For Sale $1,028,697 ?
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Thank you for [email protected]