Geodeticcoordinate: The coordinates of the reference ellipsoid in the geodetic surface. The position of the ground Point P is expressed in the earth's degree L, the land latitude b and the earth H. When the point is on the reference ellipsoid surface, only the earth is expressed in terms of land. The earth's degree is the angle between the big land mourn and the starting moon, the earth latitude is the angle between the normal and equatorial planes, the earth is high, the earth is the reference ellipsoid. the distance.
Folk Net: The square network consisting of two sets of parallel lines parallel to the projection coordinate axis. Because it is painted in the coordinate line and the coordinate horizontal line every few kilometers, it is called a square ribbon. Since the square line is also parallel to the coordinate network cable of the right angle axis, it is also known as the right angle coordinate network.
On 1: 10,000 - 1: 200,000 topographic map, the lanceline is only exhibited directly in the form of a lookable and the corresponding degree of respective numbers are indicated at the angle. In order to encrypt the network in the same picture, the encrypted dicing of the encrypted wasted net is also plugged in the inside and outside, and the "index belt" is called "index belt"), and when necessary, the short-term can constitute a cryptographic latitude and latitude network. . On 1:25 million topographic maps, in addition to the inward of the latitude network encryption, there is an encrypted cross line.
my country's 1:500,000 --1: 1 million topographic maps, directly painted the latitude and longline networks directly on the map, and there is also an encrypted downtown for encrypting the latitude and latitude network.
The coordinate system of the right angle coordinate network is the X-axis with the straight line of the central warp line, and the straight line behind the equator is a Y-axis, and their intersection is the original point of the coordinate. In this way, four quadrants appear in the coordinate system. The conjunction between the orders from the equator to the north, negative to the south; the horizontal coordinates are calculated from the central warp, and the east is positive and negative to the west.
Although we can think that the Fangli.com is a right coordinate, the earth coordinates are spherical coordinates. But we often see the role of the Ni Ri and the latitude network on a topographic map. We are very used to call the latitude network for the land coordinates. At this time, the coordinates are not spherical coordinates, and she is the same as the projection of the Chinese. (General Gaussian) and a flat coordinate
