Geographic coordinate system, geodetic coordinate system, projection coordinate system

Geographic coordinate system geographic the coordinate system spherical coordinate system is measured in latitude and longitude. Requires ellipsoid and geodetic plane

Geodetic coordinates geodetic coordinate the position of the ground point P is expressed by the geodetic longitude L, latitude B and the earth height H. The earth height is the distance from the ground point along the normal to the reference ellipsoid.

Wanli Network: A grid consisting of two sets of parallel lines parallel to the projection axis. Draw coordinate lines and dashes every whole kilometer.

Longitude, n is positive, and west longitude is negative. The prime meridian is 0 degrees, and eastward is 180 degrees, westward-180 degrees.

Latitude, north latitude, south latitude 90 degrees.

Geographic coordinate system, geodetic coordinate system, projection coordinate system