Sentence:  In order to determine the orientation of permeable joint zones, the evaluation of the borehole <WSD>televiewer</WSD> data allows a precise measurement of the planar discontinuities at the borehole wall. 
Meaning of the word marked with <WSD> tags:  An acoustic scanner that generates images of a borehole wall by transmitting ultrasound pulses from a rotating sensor and recording the amplitude and travel time of the signals.