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  • IS NGVD29 THE SAME AS MEAN SEA LEVEL?
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  • WHY DID WE SWITCH FROM NGVD29 TO NAVD88?
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  • WHY DID THE ELEVATIONS CHANGE WHEN WE SWITCHED TO NAVD88?
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  • DID WE SINK THAT MUCH?
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  • WHAT IS THE CONVERSION FROM NGVD29 TO NAVD88?
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  • Can’t I use CorpsCon to convert survey data from NGVD29 to NAVD88?
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  • WHAT IS A DATUM AND AN EPOCH?
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  • OK, AGAIN, WHAT IS AN EPOCH?
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  • WHY DOESN’T MY BENCHMARK SHOW UP ON THE NGS WEBSITE?
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  • WHAT DOES THIS 2004.65 EPOCH MEAN?
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  • WHY IS THE ELEVATION ROUNDED TO THE 0.1 FOOT ON THE NGS DATASHEET?
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  • IS GPS MORE ACCURATE THAN LEVELS?
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  • WHAT IS MLLW AND HOW DO I USE IT?
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  • WHO ELSE HAS SUBSIDENCE PROBLEMS (TEXAS?) AND WHAT ARE THEY DOING ABOUT IT?
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Who We Are
The LSU Center for GeoInformatics is the home of the Louisiana Spatial Reference Center; creator and host of Louisiana's NOAA CORS Network. LSU created C4G to focus on research and services in Geodesy and GeoInformatics; as a result C4G has established Louisiana's only Statewide GPS/GNSS Real-Time Network, C4GNet.XYZ which is entirely funded by our subscribers.

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