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2 Answers. Google Earth itself doesnt do any projection or anything, but by convention all the data (imagry, KML etc) ‘imported’ into Google Earth uses WGS84. The heights on google earth refer to EGM96 and are, therefore, Geoidal heights. The lat/long are referred to the WGS 84 ellipsoid.

Google Earth (also Google Maps and Microsoft Virtual Earth ) use a Mercator projection based on a spherical datum (in ESRI parlance, datum = “Geographic Coordinate System; GCS”) that is a modification of the WGS84 datum.

Google Earth implements coordinate system as defined in the OGC KML 2.2 standard. The vertical component (altitude) is measured from the vertical datum, which is the WGS84 EGM96 Geoid. Typically altitude can be thought of as a measure in meters above sea level (MSL) for absolute height.

The North American 1983 datum ( NAD83 ) uses the Geodetic Reference System (GRS80) ellipsoid while the World Geodetic System of 1984 ( WGS84 ) uses the WGS 84 ellipsoid. For example, the “ WGS84 projection” is a geographic one. A UTM projection is a projected one. Either of these will use only one datum.

The Global Positioning System uses the World Geodetic System ( WGS84 ) as its reference coordinate system. It’s made up of a reference ellipsoid, a standard coordinate system, altitude data, and a geoid. Similar to the North American Datum of 1983 (NAD83), it uses the Earth’s center mass as the coordinate origin.

How to see UTM coordinates in Google Earth. To view UTM coordinates, select: tools / Options. As shown in the image, the option Universal Traverso de Mercator is selected in the 3D View tab. Thus, when viewing a data, we will see that at the bottom there are coordinates in the UTM format.

Google Maps and Microsoft Virtual Earth use a Mercator projection based on the World Geodetic System (WGS) 1984 geographic coordinate system ( datum ). This Mercator projection supports spheres only, unlike the ESRI Mercator implementation, which supports spheres and ellipsoids.

Please note that the GRS80 and WGS84 are considered to be the same. Actually, there is a very small difference in the flattening which results in the semi-minor axis, b, being different by 0.0001 meters. There is no known application for which this difference is significant.

A datum is simply a foundation and reference for spatial measurements. A system of coordinates is then used to describe those measurements relative to the datum, and a projection is the visual representation of those measurements on a different surface.

The accuracy of SRTM Data can range from 5 to 10 meter, depending on where you are.

You can also see a place’s altitude, or its height from the ground or sea. Search for a place, or adjust Google Earth until you see the view you want. In the bottom right corner, you’ll see the altitude. The altitude updates as you move your mouse.

Google Earth uses digital elevation model ( DEM ) data collected by NASA’s Shuttle Radar Topography Mission (SRTM) enabling 3D view of the whole earth.

The difference is that WGS 84 is a geographic coordinate system, and UTM is a projected coordinate system. Geographic coordinate systems are based on a spheroid and utilize angular units (degrees).

NADCON for Google Earth (NADGE) Both NAD83 -to-NAD27 and NAD27-to- NAD83 coordinate conversions are supported. Position the point of interest (POI) in the center of the view.

How to Calculate the Boundaries of an UTM Zone UTM zones are all 6 degrees wide and increase from west to east starting at the -180 degree mark. Calculate the eastern boundary of any UTM zone by multiplying the zone number by 6 and substract 180. Subtract 6 degrees to obtain the western boundary.

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