1. A globe or a map, in which longitude and latitude are intertwined. Its function is to locate a point on the earth's surface.
1, the latitude of a place, that is, the angle between the geocentric vertical line and the equatorial plane.
2. The latitude number of a place in the northern hemisphere is the elevation angle of Polaris, or the horizon height of Polaris. Polaris can't be seen in the southern hemisphere. For example, the elevation of Polaris at the North Pole is 90, and at the equator it is 0.
Second, the understanding of longitude and latitude knowledge points:
1. On a globe or map, latitude and longitude interweave to form a latitude and longitude network. Using the latitude and longitude marked above, all points, regions and various geographical locations on the earth's surface can be determined.
2. Since the longitude is the line connecting the north and south poles and the latitude is the line around the earth along the rotation direction of the earth, the position of every place on the earth can be accurately indicated according to the longitude and latitude network.
3. Generally speaking, the higher the latitude of the grid with the same latitude and longitude interval, the smaller the range; The lower the latitude, the greater the scope of representation. With the same map size and roughly the same latitude, the larger the grid area, the larger the scale. The smaller the grid area, the smaller the scale.
Use of latitude and longitude net
1, longitude and latitude network can determine the position of a certain place on the earth, so it has a wide range of uses in military, navigation, aviation, communication, meteorological observation and so on.
2. The network interwoven by longitude and latitude is called latitude and longitude net, through which we can easily determine the position of any place on the earth's surface.
3. Military and security: Military and security agencies use latitude and longitude data to locate targets and monitor activities, such as UAV flight path, battlefield situation and terrorist activities. In addition, satellite images and geospatial information are also widely used in military planning and operations.
4. Navigation and positioning: Latitude and longitude data are very important for navigation and positioning. Modern satellite navigation systems, such as GPS, use satellite signals and latitude and longitude data to determine the precise position and time of any position on the earth. This makes it easy for people to find their destination in outdoor activities, including car navigation, hiking and sailing.