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  • Louisiana Spatial Reference Center (LSRC)
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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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WHAT IS THE CONVERSION FROM NGVD29 TO NAVD88?

Because of crustal motion in Louisiana, such a determination is impossible in the 21st century. Subsidence due to crustal motion is a fact in the entire Lower Mississippi Valley, and research has shown that NAVD88 elevations as far north as Memphis, Tennessee are now in error by at least 0.20 foot since the new datum was published in 1990.

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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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