You may notice that you can't delete AC folder, but that's alright. 5- Restart your computer. 6- Now, were going to re-register Microsoft Edge in your account. Open the Start menu, search for Windows PowerShell, right-click it from the result, and select Run as administrator. 7- Type the following command and hit Enter : cd C:\Users\UseYourUsername.
A geodetic datum is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys and create maps. In this way, datums act similar to starting points when you give someone directions.
From Wikipedia, the free encyclopedia. The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum of orthometric height established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.AVD 88 replaced the National Geodetic Vertical Datum of 1929 (NGVD 29), previously known as the Sea Level Datum of 1929. The elevation difference between points in a local area will show negligible change from one datum to the other, even though the elevation of both does change.