Discussion
Statements about Terrestrial laser scanning are given below :
1. It is a measurement technique that can acquire millimeter-level of detail from the surrounding area.
2. It allows rapid, automatic and periodical estimates of many important forest inventory attributes.
3. It measures the surrounding three-dimensional (3D) space.
4. It is a satellite-based technique that ensures precise standard surveys.
Which of the above given statements are true ?
Answer: A
Statements 1, 2 and 3 are true, so the answer is 1, 2 and 3.
Terrestrial laser scanning uses a laser scanner set up on the ground (usually on a tripod) to fire laser pulses at its surroundings and record millions of points, building a three-dimensional point cloud of the space around it with millimetre-level detail (1, 3). In forestry it gives rapid, automatic and repeatable estimates of tree height, stem diameter, volume and other inventory attributes (2).
Statement 4 is false, because the technique is ground-based, which is what 'terrestrial' means; satellite-based measurement is a different technology. So options including statement 4 are wrong.
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