## Is NAD83 in meters or feet?

The original (present) NAD 83 coordinate listings (covering 1×2-degree areas) will continue to be printed and distributed showing only meters, as will the existing NAD 83 Horizontal Control Data sheets.

### What is NAD83 projection?

UTM NAD83 is a projected coordinate system that represents physical locations abstracted to a flat, cartesian coordinate system. The UTM NAD83 projection uses the GRS80 ellipsoid and a center-of-the-earth anchor point as its datum, both of which are slightly different than the WGS datum.

**Where is NAD 83?**

NAD83 is the national spatial reference system used for georeferencing by most federal and provincial agencies in Canada. The physical realization of this system has undergone several updates since it was first introduced in 1986.

**Is NAD 83 a vertical datum?**

No, NAD 83 and NAVD 88 are the recommended horizontal and vertical datums, and every effort should be made to collect and publish new data using these datums.

## What does NAVD mean in construction?

North American Vertical Datum of 1988 (NAVD 88) – Vertical Datum – Datums – National Geodetic Survey.

### What is the difference between NAVD and Ngvd?

NAVD 88 is generally higher than NGVD 29, so the conversion factor will be a positive number. The elevation converted to NAVD 88 will be a higher number than the elevation in NGVD 29. To find the offset used by FEMA, you generally need to look at the Flood Insurance Study for the community/county.

**What is NAVD and Ngvd?**

Elevations determined using the North American Vertical Datum 88 (NAVD 88) standard are replacing measurements based on the National Geodetic Vertical Datum 29 (NGVD 29). The upgrade to NAVD 88 means that the values we associate with the height of water – what many people think of as mean sea level – will change.

**What is the difference between NAVD88 and NAD83?**

The North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88) provide a more accurate representation of the Earth’s shape and a more accurate depiction of the location of objects in North America than previous datums.

## What is the difference between NAD 27 and NAD 83?

The NAD 27 was based on the Clarke Ellipsoid of 1866 and the NAD 83 is based on the Geodetic Reference System of 1980. The NAD 27 was computed with a single survey point, MEADES RANCH in Kansas, as the datum point, while the NAD 83 was computed as a geocentric reference system with no datum point.