Damn, what did the remote sensing satellites do during the disaster relief, get that toy airplane re

Large aircraft and large aircraft cannot be developed with money, but also rely on the improvement of the scientific and technological level of the entire society. If there had been money to develop advanced aircraft, then the Gulf countries would have turned into superpowers long ago.

For remote sensing aircraft, the landlord may not know, "the inch is long, the ruler is short" this truth. Satellites are used for large-scale, full-space remote sensing, while Yushu County is only a small dot on the earth, and it is difficult to observe such a large-scale remote sensing as satellites. And because of the orbit, it is not possible to remotely sense 24 hours a day.

The resolution is only 10m.

The remote control aircraft has a low altitude and slow speed, and can circle around the county seat for 24 hours, and the resolution has been reached. None of the other aircraft has such good conditions, of course, it is the preferred equipment. As for the transportation of materials, of course, it is also necessary to rely on transport planes.

In the face of nature, whether rich or poor, we will treat everyone equally, and all mankind will be the victims of climate change, but people in rich countries will benefit as well as suffer. And people in poor countries only suffer, not benefit. It's not fair, of course, but capitalism is like that.

The impact of weather and time is too great for satellites to perceive. Satellites have tracks, so there is no way to pass the satellite until the time is not reached. Even if the satellite comes, if there are many clouds, there is still no way.

Besides, the ownership of the satellite is too high to be acquired.

The aircraft is flexible, convenient, cheap, low control, and easy to obtain.

It's not fair. This is the term "climate refugee", a term unique to geography.

2012 is coming soon, and everyone will be fair

Remote sensing satellites belong to the category of aerospace, satellites are far away from the earth, have wide coverage, and the corresponding resolution is lower than that of aerial remote sensing;

Aerial remote sensing mainly refers to airborne remote sensing, which has flexible control and higher resolution, but also higher cost!

At present, the main development directions of remote sensing satellites are high-resolution, hyperspectral and microwave remote sensing;

The main development direction of aerospace remote sensing is LiDAR, which can be found in relevant books.

Ground remote sensing is nothing specific and useless, something that is useless.

Aerial remote sensing, aircraft aerial photography, airborne radar, and drones are all more useful for emergency response (**Tsunami) There is also surveying and mapping The accuracy quality is higher than that of satellites, and it is used in urban areas.

Satellite remote sensing is to take pictures of satellites, the range is larger, the accuracy and clarity can be low in the long run.

I choose CMicrowave aircraft remote stove search and annihilation sense.

The first thing to say is that both A and B are remotely sensed by visible light, because in rainy weather, visible light is blocked by clouds and is not suitable for use at all. Therefore, it is possible to leave out options A and B.

The next thing to say is that we can use microwave remote sensing to tell the difference. So why not choose satellites?

Because our satellites only move outside the atmosphere, they always work in higher space. The aircraft is different, we can let the aircraft observe under the clouds, or we can change the flight altitude of the aircraft with our different requirements above the clouds, so in rainy weather, the higher resolution of the ground object is CAircraft microwave remote sensing.

There are six differences:

First, the subject is different.

The subject of aerial photography is airplanes, airships and other flying objects, and the subject of remote sensing satellites** is on satellites.

Second, the shooting range is different.

Compared with aviation, remote sensing satellites cover a larger range because the flight altitude is larger than that of airplanes.

Thirdly, the ability to shoot continuously is different.

Airplanes fly for a day or two at most, but satellite technology stays in the sky for several years in a row. As a result, its ability to sustain photography is much greater than that of an aerial aircraft.

Fourth, the clarity is different.

The clarity of aerial photography** is generally higher than that of satellite remote sensing**.

Fifth, the quality of the shooting is different.

Aerial photography** is prone to deformation, while remote sensing satellites** do not have this problem.

Sixth, the cost is different.

Because of the difference in coverage and dwelling time, there is also a big gap between the cost of shooting. The cost of satellite** is much lower than the cost of aerial photography.

Remote sensing: large range, strong anti-interference, can take things that optical images can't take, satellite scanning is convenient to quickly establish a global database.

Aerial photography: clear and real, I didn't remember it afterwards.

See what you want to do.

Satellite imagery has a large coverage, is cheaper, and has a short acquisition time, but it is more obviously limited by the weather, and there is often cloud cover on the image. Suitable for large-area use.

The aerial image is clear, the resolution is high, there is a three-dimensional relative, the three-dimensional effect is better, and 4D products can also be produced. In addition, it is highly mobile and less disturbed by the weather. However, due to the strict control of domestic airspace, it takes a long time to obtain flight data.

It is suitable for large-scale fine construction of cities.

Aviation ** is generally used for photogrammetry, as a stereo image pair, and the platform is generally an airplane, hot air balloon, etc., the height is low, the coverage of each scene image is not as large as the satellite image, the platform is unstable, the image distortion is large, the shooting cost is high, and the ground resolution is very high;

The satellite image platform is higher, the satellite attitude image pair is more stable, the image distortion is smaller than that of aerial films, the image coverage is large, the cost is low, and the image quality is better than that of aerial films.

Satellite remote sensing has a large field of view, high efficiency, stronger continuity and better reliability.

The advantage of aircraft remote sensing is high resolution, and with the advancement of remote sensing technology, aerial remote sensing is no longer an advantage.

A one-time investment benefits for many years, and a multi-year investment benefits for several days at a time. The launch of satellites with satellite launch capabilities is a one-time investment, how fast and easy it is. If it is rented to another country without the capability to develop and generate satellites, if it is not rented, but it needs to be used for a short period of time, it will be used for aircraft remote sensing.

Solve the urgent need. Now people are smart. A balloon can hang in the sky for months, and it can also be used to pretend to be a satellite!

Hello, landlord:

The procedure for making a toy airplane is as follows:

1. Preparation of materials:

1. A paulownia strip with a length of 250 mm, a width of 15 mm, a thickness of 3 mm and a length of 90 mm and a cross-section of 3 square millimeters (in a handmade bag).

2. Two rubber bands (in handmade bags).

3. A piece of 370 mm long and 80 mm wide calendar paper (or other similar paper) (bring your own).

4. A piece of single-layer blown paper or thin cardboard with a length of 120 mm and a width of 40 mm (bring your own).

Second, the production process:

1. Talk about the introduction:

The aircraft model of the annular wing has a novel style, high mechanical strength, good flight effect and easy to make. Now, using the matching materials, we make a model airplane with ring-shaped wings by ourselves.

2. Demonstration production: (multi-** physical display table to show the teacher's demonstration production process).

Figure 1 of the textbook makes the parts diagram of the annular wing model airplane, and Figure 2 is its assembly diagram and molding diagram, and students can listen to the teacher's explanation while reading the illustrations in the textbook.

1) Cut out the calendar paper (or other similar paper) in Figure 1 of the textbook, and glue the two ends A to each other to form a annular wing.

2) Cut and process the single-layer blown paper (or thin cardboard) according to Figure 1 to make horizontal wings and vertical wings.

3) Fuselage production: Take a 250 mm long paulownia strip, according to the shape and size shown in Figure 1, first draw the outline of the fuselage on the paulownia strip, and then use a sharp knife to cut off the excess part.

4) Whole aircraft assembly: first glue the horizontal tail to the plane at the end of the fuselage. When bonding, pay attention to the symmetry of the horizontal tail left and right, and keep it vertical with the side of the fuselage. Once the vertical tail is firmly attached, the wing can be attached.

5) Clamp the wing to the fuselage with a paulownia strip about 90 mm long, tie the paulownia strip firmly with the fuselage with a rubber band, (you can refer to the textbook assembly drawing) point A at the wing bonding point coincides with the wing centerline, so that the rings on the left and right sides of the wing are equal in size and shape. In order to make the wing have a stable upper and reverse angle, after the rubber band is fixed on the wing, apply a little glue on both sides of the paulownia strip, and glue the root of the upper wing surface and the side of the paulownia strip to each other.

6) Test flight adjustment: After the model aircraft is thrown, the attitude of the aircraft shows the nose planting, which is the reason why the nose is too heavy, and the wings can be moved appropriately in the direction of the nose. If the trajectory of the aircraft is wave-like, the nose is too light to move the wings back.

If the trajectory of the aircraft is not straight and it always circles and flies, then you can check whether the left and right shapes of the wings are consistent and adjust them; Or adjust the flight course by adjusting the rudder (vertical tail).

Because the plane flies low! But this should be on the premise of a remote sensor of the same resolution. However, the resolution of the current satellite remote sensor has also improved a lot, so it does not necessarily mean that the satellite ** must not have the high definition of the aerial film.

Airplanes are generally about 10,000 meters in the stratosphere, and satellites are more than 200 or 300 kilometers away from the atmosphere. The space environment is extremely harsh, with the interference of various rays, the refraction of the atmosphere and other reasons. There is also the problem of distance and power.

Airplanes are closer to Earth than satellites.