What's a ground control point?

• Fixed reference point with known coordinates
• Used to improve the accuracy of aerial photography measurements.
• Ensure that mapping results correspond to actual geographic locations DJI TERRA Drone Mapping Software Introduction

fundamental requirement

1. Appearance

• Size: 50 x 50 cm
• Use high contrast colors
• The centerpiece needs to be clearly identifiable

1. Principle of Placement

• Use at least 3 control points
• Distributed evenly over the measurement area
• Avoiding the effects of shelter

Precision Measurement Methods

• GNSS receiver using RTK or PPK Virtual Reality (VR) Industry Development Trends
• Make sure the measuring rod is level
• Precise recording of control point coordinates

Suggestions for Use

1. Quantity Configuration

• Depending on the size of the venue
• Increase in topographic relief
• Ensure coverage of survey area boundaries

1. Points of Attention

• Fixed and stable, not easy to move
• Make sure it's clearly visible from the air
• Regular inspection and maintenance

Even if RTK or PPK drone is used, it is still recommended to set a small number of ground control points (GCPs) to ensure the reliability of the measurement results. Reasonable configuration of GCP can not only improve the measurement accuracy, but also save the time and cost of repeated operations. Advantages of VR Technology in the Real Estate Industry