2D

2D

Absolute Accuracy in the Alpine

Absolute Accuracy in the Alpine

By Mary Jo Wagner When a Cessna fixed-wing aircraft took off over an Austrian alpine region one August morning, it ascended carrying two crew, a large format digital camera, a…

Surveying

Proper GPR surveying techniques

Proper GPR surveying techniques

Tips and best practices for getting the most from investigations. By Brian Jones Ground-penetrating radar (GPR) is one of the most accurate non-destructive testing methods available. To get the most…

Unpiloted Systems