On February 7, 2022, NASA released topographic maps, satellite maps and other data about the Continental Winter Olympics. Let us see a state of the Winter Olympics again in space, which took a satellite map of the vicinity of the "Bird's Nest", which once again showed that the Us satellites are indeed relatively powerful, and the images taken are indeed relatively clear.
However, for the Winter Olympics, in fact, the mainland has released relevant satellite images, film and television pictures as early as early February 2022.
We have seen a unique side of the Winter Olympics from satellites. And every time we take a space satellite, everyone will put together satellite pictures from all over the world to compare. And this time, let's take a look at which country's satellites are better at watching the Olympic area?
Is it similar to what everyone said before when the Tonga volcano erupted, the continental satellite is inferior to the human, and it is clearer than the Us satellite? This time we'll just wipe our eyes and take a look. Of course, we have already shown in the satellite map of the Tonga volcano that there are many factors, and we will not explain them here.
NASA (NASA) released this time, mainly a three-dimensional map, contains the 2022 Winter Olympics three project areas, from this satellite image, you can indeed clearly see the structure of the building, even if the surrounding area of the building, if you are careful, you can clearly count it.
What satellite shot this? Mainly from the Landsat 8 shooting support, we also mainly for this satellite to explain.
How strong is landsat 8? The Landsat 8 satellite is made up of two scientific instruments, which are indeed much more powerful than the Landsat 7, mainly including the operational land imager (OLI) and the thermal infrared sensor (TIRS), which provide seasonal coverage of the global land with a spatial resolution of 30 meters (visible light, near infrared, shortwave infrared). It was developed in collaboration with NASA and the United States Geological Survey (USGS).
It contains an OLI, a push-sweep sensor with a four-mirror telescope that collects data in the visible, near-infrared, and short-wave infrared spectral bands, as well as the panchromatic band. And it can return 400 scenes every day, and regularly obtain 725 scenes, which is not greatly affected by the atmosphere. Capable of drawing with a high precision of 12 meters or more. So landsat 8's satellite imagery is indeed more powerful.
But China's satellites are not bad, at the time of the eruption of the Tonga volcano, the Chinese Fengyun 2F perspective, the Chinese Fengyun 4B perspective, FY-3E/MERSI and other satellites also carried out related shooting, and showed the strength of the Chinese satellite, let us clearly witness what is a powerful satellite.
For satellite shooting, China actually has a lot of commercial satellites are more powerful, such as: Jilin No. 1, of course, this is only one of them, we also come to introduce it, it can be said that compared to nasa (NASA) to shoot the Winter Olympics satellite map is much clearer.
How strong is Jilin No. 1? Jilin No. 1 may not be familiar to many people, this is a mainland commercial satellite, is the continent's important optical remote sensing satellite constellation.
Its main function is commercial application, can be used in urban shooting, land mapping, mineral resources development, disaster prevention and emergency response, etc., can also perform 4K ultra-clear video shooting, the earth picture shooting resolution can reach 0.75 meters, the original image transfer function is better than 0.10, the signal-to-noise ratio is better than 40dB, and the degree of interpretation is high.
The attitude control accuracy is better than 0.0005/s, the triaxial attitude determination accuracy is better than 2 arcseconds, etc., so it is also a powerful satellite system. Of course, the entire system is still under construction. It is expected that 138 satellites will be operated in orbit in 2030 and the satellite network will be completed.
The U.S. Naval Shipyard photographed by Jilin No. 1
It was once popular for photographing the U.S. Naval Shipyard, and the different types of ships docked in the harbor are clearly recognizable and spectacular. Of course, in addition to these, it also achieved the highlights of NASA shooting, and it is also a "transnational" shooting.
The U.S.-Nashville house photographed by Gilling One is also clearly visible, able to count clearly, even more powerful and clear than the Landsat 8 satellite
The satellite map of the Rio Olympic venues taken by Jilin No. 1 can also clearly see the Brazilian aircraft carrier near the venues
Therefore, on the whole, China's satellites are not bad. For the satellite image shooting related to the Winter Olympics, although the mainland did not announce which satellites were taken, it was clearer than NASA. For example, the satellite map of the water cube and the bird's nest, the structure is very clear.
Satellite view of the Water Cube and the Bird's Nest
The Zhangjiakou Division is also a clearly visible geographical map
So, on the whole, China's satellite map is clearer, and this is the truth. At least from the satellite photos of the Winter Olympics, China has taken a good picture.
Of course, in the end, it must be explained that all kinds of satellites are differentiated, and we cannot say which country's satellites are strong and which countries' satellites are poor. And there will be differences in shooting at different angles.
Therefore, any satellite map taken by the satellite, there is no "good or bad", nor can it be said which country's satellite image is good, that is bad. We just need to try to do our best, there is no need to be worse than good, each country may have a unique satellite "on its own", better than other countries in the region, but we don't know.