What does the color of satellite land mean? Satellite land.

Satellite remote sensing is to detect the reflection of electromagnetic waves and electromagnetic waves emitted by objects on the earth's surface through satellites in space, so as to extract the information of these objects and complete the long-distance identification of objects.

If the surface of the earth is clear, the satellite observes the infrared radiation information emitted from the ground to space, and the satellite cloud picture is black and gray. The darker the black, the stronger the ground radiation and the better the weather. When the sky is covered with clouds and rain, the satellite observes the infrared radiation from the cloud top into space, which is white or grayish white. White indicates that the ground radiation is very weak, the temperature is very low, the cloud system is very thick and dense, and the rainfall intensity is also very high.

The transition zone between clear sky area and cloudy and rainy area is usually covered by dark gray, gray and light gray clouds, indicating that there are clouds with different thicknesses and no obvious precipitation. On satellite images displayed on TV, the surface and ocean are usually represented by green and blue.

The visible light cloud pictures taken by meteorological satellites from space are taken by using the scattered light generated by the coarse-grained scattering of sunlight by cloud droplets and ice crystals. White on the cloud image indicates strong sunlight reflection, and gray and black places indicate weak reflection. Because the reflection ability of the land is higher than that of the ocean, the land on the visible light cloud map is gray, the ocean is black, and the area covered by ice, snow and deep clouds is generally white. ?

Extended data:

Precautions:

For real-time satellite maps, it is clear that all commercial and civil satellite maps in the world are stored on the server, that is, after the satellite is photographed, it is stored on the server after manual screening, and the data is obtained from the server to see the image. No one has the ability to directly control satellite shooting, unless you are a soldier, so there is no real-time satellite map.

In the Asia-Pacific region, due to the existence of high-orbit satellites, the positioning accuracy will be higher, which can provide accurate positioning, speed measurement and high-precision standard time for most parts of the earth's surface. It can meet the needs of users located anywhere on the global ground or in near-earth space to continuously and accurately determine the three-dimensional position, three-dimensional movement and time.

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