Economic efficiency comparison between new schemes for drone control of aerial surveys and traditional schemes

This program compares the production of 1:1000 digital line drawing in Shandong test area. The production links involved are UAV flight, image control production and air three encryption. Since the subsequent orthophoto production and digital line drawing production is still using the original space vision EPT and MapMatrix, it does not involve the impact of production efficiency, so it does not participate in the production process comparison of this program.

I. Overview of the program
1 The new scheme directly acquires the coordinates of the camera by installing the GNSS dual-frequency receiver on the drone, guarantees the connection strength of the regional network through the flight structure route, and then measures the coordinates of a small number of ground control points, and performs null encryption. The GPS-assisted adjustment is used in the encryption process to obtain the result of the null-encryption that meets the accuracy requirements (the new scheme referred to below refers to the scheme).
2 The traditional scheme UAV is flying according to the route that meets the overlap requirement. The design of the route is not adopted in the design of the route, and the image of the drone covering the survey area is obtained. According to the specifications of photogrammetry, the coordinate of the ground control point of a certain density is measured, and then the air three encryption is performed, and the GPS-assisted adjustment is not used in the null encryption process until the air encryption result conforming to the accuracy requirement is obtained (the tradition mentioned below) The plan is unified refers to the program).

A new program operation process
1 Survey area The survey area is located in the plain of Shandong Province. It is a flight. The camera is a Nikon D800. The camera has a focal length of 35mm and the designed flying height is 370 meters. A total of 1399 drone images with a resolution of 0.05 meters are obtained. Covering an area of â€‹â€‹10.76 square kilometers. There are 10 east-west navigation belts and two framed navigation belts. The whole survey area is trapezoidal. The field flight operation time is 1 day.

2 Image control measurement A total of 4 flat high control points and 13 flat high check points were placed in the entire survey area, and an image control group was put into operation. The operation time was 1 day. Four flat height control points are distributed in the four corners of the survey area, and 13 flat high check points are evenly distributed in the middle of the survey area. The approximate position is as shown:

3 empty three encryption This production process calls an empty three encryption personnel and a computer. After getting the image data, the data is sorted, the air three encryption points, and the camera coordinates are solved, which takes one day. After the turn point is completed, the control point is swayed and the rough point is adjusted, which takes one day. Checkpoint encryption accuracy is as follows:

The error in the plane of the inspection area is 0.114m, and the error in the elevation is 0.065m. Fully in line with the "GBT_23236-2009_Digital Aerial Photogrammetry_Aerial Triangulation Specification" in the 1:1000 digital line drawing checkpoint space three encryption plane error 0.35 meters, the accuracy of the elevation error of 0.28 meters.

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