In fact, the purpose of Wei Minsheng's desire for this digital map is to establish his own GIS (geographic information system) platform, and then integrate the construction of the villa with the surrounding resources, population and other information databases, so that he can more easily understand the construction and development scale of Huaxia Villa, so as to formulate a better development plan.

If Wei Minsheng wants to make a digital map, it is not possible to directly use satellite maps in the real world, because the terrain and landform have changed greatly over the past thousand years.

Moreover, the changes to the surface of the land caused by the construction of modern buildings and roads have also caused the existing digital photographs to have no reference role in this world.

However, at present, Huaxia does not have the technology and financial resources to launch satellites, so it is impossible to obtain a clear satellite map of the world.

The outline drawn on the floating platform gave Wei Minsheng some inspiration, but the platform was not very convenient to move, and there were some problems when encountering complex terrain such as mountains and valleys.

And although helicopters already exist, excellent pilots who can cope with complex terrain and weather conditions are not so quickly trained.

At present, the only people who can perform simple operations on the helicopter are Long Hao and Wei Minsheng, but Long Hao exists as Wei Minsheng's material exchange center in the real world, and he can't take the time to do these things at all.

Long Hao can't get out, and Wei Minsheng is even less likely to have time to engage in the collection of this basic geographic information.

Moreover, if you want to take high-definition digital photos with full coverage of such a large area of terrain, the cost of flying a helicopter is too high.

In Wei Minsheng's eyes, this helicopter exists as the ultimate strategic weapon of Huaxia Kingdom, with its participation, coupled with that super-large capacity shared space, with the support of real-world materials, all the cities and defense systems in this world are like nothing.

Such ultimate power should still be used at the most critical time, and it is a bit overkill to use it for these simple tasks.

In the end, Wei Minsheng hit the idea on the photos taken by the drone.

In the real world, due to the control of flight altitude, coupled with the serious interference of electromagnetic signals in the city, the remote control altitude and flight radius of the UAV have also been seriously affected, and the flight altitude of the UAV can generally only be below 500 meters, but at the height of 500 meters, it has been basically possible to shoot the outline of some small cities.

Without these controls and electromagnetic interference, flying close to 1,000 meters below the clouds would be enough to take a full picture of most medium-sized cities.

For the world owned by Wei Minsheng, there is almost no electromagnetic signal now, so the drone can reach the best control distance.

Although there is no GPS signal for horizontal coordinate positioning, which affects the function of the drone to fly autonomously according to the planned route, Wei Minsheng only needs to control it up and down if it is used as a high-altitude camera, and the built-in barometer and inertial measurement unit of the drone can fully stabilize its hovering position in the air.

As for the distortion caused by the shooting angle of the corners of high-altitude overhead photos, it can also be solved by increasing the density of shooting points.

Generally speaking, the maps stored in the GIS system are divided into vector maps and raster maps, and raster maps are from satellite photos or aerial photos, which are divided into fixed-size photos according to a certain scale.

When the user makes a map request through the GIS system, the system will extract the required photos from the corresponding catalog according to the coordinate position of the request and the size of the scale.

If the requested location happens to be in the corner of a photo, the system will simultaneously extract the adjacent photos and display them to the end user in a seamless stitching manner.

So, the digital map, which can be zoomed in and out almost infinitely, is not actually a single photograph, but is made up of countless small photos.

After adopting this method, only the contents of four photos need to be loaded at the same time in extreme cases, which greatly improves the loading speed of photos, and effectively reduces the processing work of the picture by the terminal equipment, and can be easily replaced when the photos in individual places change.

When you use Google Maps, when you zoom in to a certain extent, you can clearly see that the photos that were taken at different times are completely composed of squares one by one.

Of course, the role of GIS system is far from being as simple as a digital map, its hierarchical information management method can cover almost everything that can be displayed in an informational way, and there will be no conflict between the operations of different information owners.

However, these are all things for the future, Wei Minsheng just wants a detailed digital map now, and he can browse the map through the network terminal device.

Photos taken at low altitude with drones can completely surpass aerial photos in terms of clarity.

Because for digital photos, the main factor that determines their clarity is the CCD imaging chip, and the area size of this chip determines the maximum resolution of the photo it generates.

It is true that the cameras used in aerial photography equipment are much larger in the area of the imaging chip than ordinary photography, but the use of aerial photography equipment is often in the kilometer range.

According to the imaging principle of the camera, the shooting distance is doubled, and the area that can be displayed in the photo is quadrupled.

However, the imaging unit of the CCD imaging chip is fixed, so the farther away you shoot, the more details are lost in the photo.

In this way, at an altitude of 500 meters, only a quarter of the size of the CCD imaging chip of the aerial camera is needed to obtain the same resolution as the aerial camera taking photos at an altitude of 1,000 meters.

Moreover, as the shooting height is reduced, the details that can be captured in the digital photographs are even richer, and even the grain grown in the field can be seen clearly.

The digital map obtained in this way is far clearer than the highest-end satellite map of the United States.

At the right time, Wei Minsheng can install these digital maps on his laptop or tablet, and use the method of browsing offline maps to confirm his location according to the surrounding rivers, mountains, lakes and other related terrain.