Abstract
Abstract Several steps are needed to assay accuracy of optical instruments used to measure tree height and upper-stem diameter. Preliminary tests establish basic instrumental and observer accuracy under easy measuring conditions. In the forest, accuracy deteriorates because visibility is impaired. By use of controls and comparison with accurate linear measures, sources and size of most bias and blunders can be identified. Accuracy is limited by an interaction of instrument, observer, and conditions of measurement. Forest Sci. 21:421-426.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
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Claims 3
Claim · model-written summary
Optical instrument measurement accuracy deteriorated in forests when visibility was impaired.
Not reportedComparatorValue
Verbatim
e0“In the forest, accuracy deteriorates because visibility is impaired”
t0“Tree Measurements”
Claim · model-written summary
Controls and accurate linear measures identified sources and size of most measurement bias and blunders.
- Taxon
- Treet0
- Outcome
- sources and size of most bias and blunders can be identifiede0
- Comparator
- accurate linear measurese0
Not reportedValue
Verbatim
e0“By use of controls and comparison with accurate linear measures, sources and size of most bias and blunders can be identified”
t0“Tree Measurements”
Claim · model-written summary
Instrument, observer and conditions of measurement jointly limited accuracy.
- Taxon
- Treet0
- Outcome
- Accuracy is limitede0
- Qualifier
- interaction of instrument, observer, and conditions of measuremente0
Not reportedComparatorValue
Verbatim
e0“Accuracy is limited by an interaction of instrument, observer, and conditions of measurement”
t0“Tree Measurements”