کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9620526 | 159443 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of the Laser-relascope
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
With the use of a Laser-relascope, diameter measurements were almost unbiased (overestimation 1.3Â mm), with measuring distances of 1.4-15.0Â m. The standard error was 8.2Â mm. The accuracy was dependent on the distance, the slot width, measuring time of a tree, and the diameter at breast height (dbh). The individual's familiarity with the Laser-relascope also had an effect on the precision of diameter measurements. In height measurements, the device produced unbiased results. The standard error was 4.9Â dm. Locations of trees could also be determined with good precision. The mean distance between the observed and correct location was 32Â cm. The measurements of the height and location were not affected by experience with the device. The precision of volume estimation was dependent on the basal area and the time needed to measure a tree. Measuring a sample point took on average 15.5Â min and the measuring of a single tree 85Â s. Measuring time was dependent on basal area, visibility, and dominant species. The device can be used throughout the day with moderate strain. It is most suitable for near mature forests with good visibility.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 204, Issues 2â3, 17 January 2005, Pages 181-194
Journal: Forest Ecology and Management - Volume 204, Issues 2â3, 17 January 2005, Pages 181-194
نویسندگان
J. Kalliovirta, J. Laasasenaho, A. Kangas,