Decay detection in TREES

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Across
  1. 2. used to strike the trunk of a tree to listen for a change in pitch to indicate the transition from sound wood to decayed wood.
  2. 4. TOMOGRAPH, The instrument measures the velocity of sound waves in wood
  3. 5. PUZZLE : DECAY DETECTION IN TREE
  4. 8. PENETRATING RADAR, Uses electromagnetic waves as a signal.
  5. 10. Using laser to measure a tree's height
  6. 11. Unmanned Aerial Vehicle
  7. 13. Arbosonic decay detector
Down
  1. 1. Measures wood resistance by drilling
  2. 3. SPADE, Uses compressed air to facilitates soil excavation
  3. 6. Detect decay in trees by measuring resistance to an electric current
  4. 7. TRANSPLANTING is the process of digging, pruning, moving and replanting a tree from one location to a new location
  5. 9. DETECTION TOOL, instruments that is used to detect wood decay in the absence of visible indicators in trees
  6. 12. Visual Tree Assessment