FAQs

Categories
1. Surveying
2. Real-Time Network
3. LSRC
4. CORS
FAQs
HOW DO I CONVERT NGVD29 TO NAVD88?
IS NGVD29 THE SAME AS MEAN SEA LEVEL?
HOW DO I CONVERT OLD SURVEYS TO NAVD88?
WHAT IS CORS?
WHY DID WE SWITCH FROM NGVD29 TO NAVD88?
WHY DID THE ELEVATIONS CHANGE WHEN WE SWITCHED TO NAVD88?
DID WE SINK THAT MUCH?
HOW CAN I GET AN ACCURATE, UP-TO-DATE ELEVATION?
CAN’T I USE CORPSCON TO CONVERT SURVEY DATA FROM NGVD29 TO NAVD88?
WHAT IS THE CONVERSION FROM NGVD29 TO NAVD88?
WHAT IS A DATUM AND AN EPOCH?
OK, AGAIN, WHAT IS AN EPOCH?
WHY DOESN’T MY BENCHMARK SHOW UP ON THE NGS WEBSITE?
WHAT DOES THIS 2004.65 EPOCH MEAN?
WHY IS THE ELEVATION ROUNDED TO THE 0.1 FOOT ON THE NGS DATASHEET?
MY HANDHELD GPS GIVES ME BAD ELEVATIONS. WHY?
IS GPS MORE ACCURATE THAN LEVELS?
WHAT IS MLLW AND HOW DO I USE IT?
WHO ELSE HAS SUBSIDENCE PROBLEMS (TEXAS?) AND WHAT ARE THEY DOING ABOUT IT?
WHAT KIND OF GPS RECEIVER DO I NEED?