Auto-orientation of Multi-stations TLS point clouds with bundle block adjustment

Abstract

Abstract:

In order to calculate parameters of coordinate-converting of multi-stations TLS point clouds and convert point clouds in scanner's own coordinate system to specified-engineering surveying coordinate system, a mathematical model regarding bundle block adjustment is proposed. Based on Rodrigo Matrix, the model sets the lights between the central of scanner and targets as units which make up adjustment equations. The equation is accompanied unknowns for single light and constraints for lights between shared targets. There are six approaches to bundle block adjustment according to different types of observations and experiments showed one of them called "mathematic model lies in the assumption that specified coordinates is of high accuracy while scanned coordinates contains several measurement errors ". The final experiments results show that the external-accordance-accuracy is within 1CM, indicating an order of magnitude improvement when compared with Independent Models. Converted scanner's own coordinates are capable of meeting the accuracy of terrestrial map surveying with the scale of 1:500.

Key words: Coordinate-converting Model, Point Clouds Orientation, Bundle Block Adjustment, Independent Model Method, Accordance-Accuracy

References

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