What projections does Google Earth use?
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.
Is Google Earth a Mercator projection?
Up until now, Google Maps has used Mercator projection, which projects the planet onto a flat surface. While this style makes it easy to print onto maps and has largely become standardized, it presents a distorted image of the Earth.
Does Google Earth use NAD 83?
NADCON for Google Earth (NADGE) Both NAD83-to-NAD27 and NAD27-to-NAD83 coordinate conversions are supported.
What UTM datum is Google Earth?
Universal Transverse Mercator
Which datum is used by Google Earth?
WGS84 datum
What geodetic datum does Google Maps use?
Mercator projection
Which datum ie reference ellipsoid is used by Google Earth?
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.
What datum does Google Earth use for elevation?
Your GPS receiver uses WGS84 and the elevations are based on the NAD83 ellipsoid.
Where is WGS 84 used?
The World Geodetic System is a standard for use in cartography, and in navigation. It comprises a standard coordinate frame for the Earth, and a gravitational equipotential surface (the geoid) that defines the nominal sea level. The current ICAO standard World Geodetic System is WGS84.
Does Google Earth use geodetic latitude?
The Maps JavaScript API uses the following coordinate systems: Latitude and longitude values, which reference a point on the world uniquely. (Google uses the World Geodetic System WGS84 standard.)
What conceptual shape of the Earth is considered best for map projections in GIS?
Conical projections are best used to map relatively small areas because a small area map limits conical projection distortion. Types of Conical Projections include: Equidistant Conic projection. Lambert conformal conic.
What are the 4 common map projections?
Introduction
| Projection | Type | Key virtues |
|---|---|---|
| Stereographic | azimuthal | conformal |
| Lambert Conformal Conic | conic | conformal |
| Mercator | cylindrical | conformal and true direction |
| Robinson | pseudo-cylindrical | all attributes are distorted to create a ‘more pleasant’ appearance |
What are the 5 map projections?
Top 10 World Map Projections
- Mercator. This projection was developed by Gerardus Mercator back in 1569 for navigational purposes.
- Robinson. This map is known as a ‘compromise’, it shows neither the shape or land mass of countries correct.
- Dymaxion Map.
- Gall-Peters.
- Sinu-Mollweide.
- Goode’s Homolosine.
- AuthaGraph.
- Hobo-Dyer.
What is the most accurate flat map projection to use?
The lower the score, the smaller the errors and the better the map. A globe of the Earth would have an error score of 0.0. We found that the best previously known flat map projection for the globe is the Winkel tripel used by the National Geographic Society, with an error score of 4.563.
What are the 3 main map projections?
This group of map projections can be classified into three types: Gnomonic projection, Stereographic projection and Orthographic projection.
Which map projection should I use?
Use equal area projections for thematic or distribution maps. Presentation maps are usually conformal projections, although compromise and equal area projections can also be used. Navigational maps are usually Mercator, true direction, and/or equidistant.