Discussions

The requirements for drone operation and demonstration are also increasing. The key point is to arrange the image control points. This also directly determines the display of the drone aerial survey results. Generally, there are professional drone companies with specialized technologies. So how to properly arrange the image control points?

1. Determine the number of image control points according to the aerial survey area

The accuracy and quantity of image control points directly affect the accuracy of aerial data processing, so the layout and selection of image control points should be as standard, strict and precise as possible.

In general, the number of control points for UAVs with different airfoils is also different.

Taking a composite wing drone as an example, assuming a scale of 1: 1000, 5 image control points are suitable for 3 square kilometers, and 10 image control points are suitable for 7-8 square kilometers.

Take the six-rotor UAV P560H as an example, flying a 1: 1000 scale result, it is suitable to arrange 5 image control points in 0.3 square kilometers.

Second, set up image control points in the field

Before setting up the image control points, you must make preparations. First, you must check the geological and geomorphological conditions of the aerial survey area, and prepare oily spray paint and target boards (wooden boards or cardboard).

The image control point should be selected on the feature point with a clear impression. When the stab point policy and orientation cannot be coordinated, the policy is the main point.

Third, the image control point measurement

When the image control point is measured, the bubble is centered or fixed with a triangular support rod. It is acknowledged that the measured image control point position and the corresponding point number are correct, and the coordinates corresponding to the point number cannot be mistaken.

Determine and set the corresponding instrument antenna type and antenna height (image control point elevation is particularly important).

Finally, you must first acknowledge the parameters needed for the coordinates of the control point, such as projection, coordinate system, central meridian, and band.