1, the concept and expression of latitude and longitude network: latitude and longitude network is a geographical coordinate system, which is made up of a group of latitude and longitude lines. Meridian refers to the great arc connecting the north and south poles, while latitude refers to the small arc line perpendicular to the meridian. The graticule can be used to determine the position of any point on the earth's surface.
2. Concepts of longitude and latitude: Longitude refers to the angle between a point on the earth's surface and the prime meridian, while latitude refers to the angle between that point and the equatorial plane. Longitude increases from 0 to east and west, and latitude increases from 0 to north and south.
3. Projection of graticule: The graticule map can be obtained by projecting the graticule on the earth's surface onto a plane map. On the map of latitude and longitude, longitude and latitude intersect to form many squares, rectangles and triangles, which can be used to determine the position of any point on the earth's surface.
Advantages of latitude and longitude net:
1, the unity of uniqueness and infinity: the latitude and longitude of every point on the earth are unique, and a set of specific latitude and longitude values can only mark one place, which is unique. At the same time, the latitude and longitude network is infinite, because the latitude and longitude can extend infinitely to the extreme, forming countless latitude and longitude grids, which have great information carrying capacity.
2. Harmony of absoluteness and relativity: latitude and longitude have their own absoluteness and relativity. The meridian represents the north-south direction, which is absolute; Latitude represents the east-west direction, which is relative. This harmony of absoluteness and relativity makes the latitude and longitude network have high accuracy and reliability in determining the direction and position.
3. The combination of visualization and mathematical rationality: the grid lines can be represented by plane images and mathematical formulas. On the plane image, the latitude and longitude lines interweave with each other to form a grid, which can visually see various geographical elements on the earth's surface. In mathematical formulas, latitude and longitude can be expressed by mathematical variables, and various calculations and analyses can be carried out.
4. Intersection of Planarity and Stereo: The latitude and longitude net can map the two-dimensional position information of the earth's surface to a plane map, which makes the acquisition and processing of geographic information more convenient. At the same time, the latitude and longitude network can also represent the three-dimensional coordinates of the earth, and can represent geometric features such as points, lines and surfaces in space.