Satellite, especially resource satellite identification ability is still very strong, it and big data supporting, can be clear. So how do satellites know whether it's arable land or wasteland?
First, the fine identification power. Now the resource satellite recognition power to the level of square meters, some like the forest resource satellite can identify a squat smoking under the tree or a walking leopard. And distinguish whether it is arable land crops or weeds, that scene, that plant images are different, crops are neat, and wild plants on the wasteland is disordered. Even the satellite can also estimate the yield, is based on the crop dense planting situation to plan out the year's initial harvest of crops!
The second is to seize the summer harvest and fall harvest key season wilderness form to build the year vegetation cover digital map. Summer and fall cultivated land changes a lot, the day before yesterday a gold, yesterday a piece of soil, today a piece of water, tomorrow inserted into the rice planting will become a piece of green, which was recorded by the satellite, proving that this is arable land. Those who have kept their original form and not moved are basically wastelands! After the satellite found the wasteland, the central land management department will order the county land management bureau to investigate!
Third, the wasteland vegetation, such as weeds and shrubs and crops such as rice in the spectral chromatography is quite different, perhaps the human eye is difficult to recognize, but modern scientific instruments to analyze the precision. Conventional rice and wheat spectral chromatography standardized, where non-standardized chromatographic spectral sequence, basically non-crop, belonging to the wasteland!
Fourth, the state has land resource maps, where must guard the land resources that should be cultivated, there are digital maps, with Beidou satellite navigation, accurate to meters. So the national resource satellite scanning defined area of arable land, and Beidou navigation coincides with, and soon know where to throw away, where occupied masonry house, a little bit of concealment. If you don't believe me, you open the Gaode map or Baidu map, you check your home around a road or a pond, or a house, a clear!
So don't take a chance, thinking that in the countryside in the nook and cranny of the desert for a few years, the emperor does not know! The fact is not so, the state gives you a record. Once the policy changes, where not farming unconditionally recovered your land contract management rights, that time really can not do!
The local farmland is reported to the Bureau of Land and Resources. China has its own earth resources satellite. One of the tasks is to check the land use situation. I personally estimate that the reported arable land has generated a digital map. A large database has been built. Real-time images from the satellite are regularly compared with the database. If anomalies are found definitely alarmed. Feel this comparison technology and face recognition is also similar.
Say a real case. I have a friend to open the company. Due to the development of the business original plant can not meet the requirements! As a result, the countryside government to find a piece of land. With the land, we started to build the plant. Basically finished building, the results of the problem. The upper side of the people came to seize. The deadline for demolition. In the end, they demolished the whole thing and returned it to its original state. Cultivated land is the land red line set by the state. You can't cross the red line. You can't bargain!
Later, my friend said to me, "This satellite is really powerful! What all know."