A favourite side-valley is the lidar, for which the road takes off from the main valley at Bijbehara.
lidar detects shape directly and shape fluctuations such as vibration and motion and has proven very hard to spoof.
And so, in marches of about ten miles a day, we came to Pahlgam on the banks of the dancing lidar.
Islamabad is the starting-point for both the lidar valley and Martand, and here the house-boat may be left.
There are many other important active sensor classes, three of which are active acoustics, lidar and magnetic anomaly detectors.