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Google Earth uses a "Simple Cylindrical projection," which is also known as Plate Carrée, with a World Geodetic System of 1984 (WGS84) datum.This is a simple map projection where the meridians and parallels are equidistant, straight lines, with the two sets crossing at right angles.Google Maps uses the Mercator projection also with the WGS84 dataum.The vertical component (altitude) is measured from the vertical datum, which is the Earth Gravitational Model 1996 (EGM96) Geoid. Altitudes are measured in meters.
You read a weather map by looking at all the symbols. First look for the high and low pressure signs. They look like big H and a big L the H is red and the L is blue. Then look for the warm front and cold front symbols, the cold front is blue with triangles on the top a warm front is red with circles on the top. There might even be a purple design on the map which is a combination of a warm front and a cold front. Second look for stationary fronts, they are a pattern of a warm front and a cold front they indicate air masses in the same location are the precipitation symbols, the rain symbol and the snow symbol. The rain symbol looks like black dots and the snow symbols are black snow flakes. the are also freezing conditions and blowing snow, the freezing conditions look like a curvy line with a black dot under it and a black curvy line with a comma. The blowing snow symbol looks like two arrows intersecting. That is how to read a weather map.
The latitudes half way between the equator and poles are at 60 N & S At these latitudes the circumference is half of that at the equator. The Earth's circumference at the Equator is approx. 24,000 miles. At latitudes 60 N & S the circumference is 12,000 miles. At the poles N & S, latitude 90 N & S, the circumference is '0' (zero) ; a dot point. Taking an angular value for half way at 45 o N & S , the circumference is approximately 17,000 miles.
I have heard them called Map Coordinates and Geodetic Coordinates.
The two map coordinates or geodetic coordinates are latitude and longitude measured on the surface of the Earth's globe-shaped surface or at mean sea level or at the magnetic geoid.
Rudi Geodetic Point was created in 2006.
geodetic
Geodetic azimuth is when you measure in a Brunton compass from 0 to 360 degrees clockwise.
U.S. National Geodetic Survey was created in 1807.
The use of stars in geodetic measurements has been replaced by GPS satellites.
Using WGS 84 Datum Bilbao is located at 43°15′25″N 2°55′25″W. A Datum is a cartographer/mathematical description of the surface of the earth. There are many Datums and each have unique coordinates. WGS 84 stands for World Geodetic Survey 1984 which is a popular Datum.
Emery I. Balazs has written: 'Corrections applied by the National Geodetic Survey to precise leveling observations' -- subject(s): Leveling, National Geodetic Survey (U.S.), National Geodetic Survey (U.S.).
Geodetic surveying measures large areas of land, using applied mathematics to make corrections by accounting for the roundness of the earth.
A geodetic network
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