{"title":"芬兰国家森林资源清查中的上茎直径和体积预测策略","authors":"Virpi Stenman, Annika Kangas, Markus Holopainen","doi":"10.14214/sf.23021","DOIUrl":null,"url":null,"abstract":"In forest inventories, field data are needed for the prediction of tree volumes. However, gathering field data requires resources, such as labour, equipment, and data management operations. This means that time and budget, as well as quality, must be carefully considered when National Forest Inventory (NFI) field measurement activities are planned. Therefore, the development of cost efficient, simple, safe and reliable measurement methods and tools are of great interest. To date, upper stem diameter (d6), which provides a more reliable estimation of tree stem volume, has typically been measured with a parabolic calliper. In this study, the performance of the Criterion laser-based dendrometer was examined for d6 measurements. A total of 326 sample trees were measured multiple times with three different measurement instruments. These instruments were used to measure diameter at breast height (dbh) as well as d6 measurements. Bland-Altman plots and measurement error variances were used to determine measurement instrument reliability. For all trees, the standard deviation for the laser based dendrometer was 18.73 mm at dbh and 15.36 mm for the d6 measurements. When the performance of Criterion was analysed with reference to the mean value of repeated measurements, the standard deviation in the dbh measurements was 12.21 mm, and 8.88 mm in the d6 measurements.","PeriodicalId":49520,"journal":{"name":"Silva Fennica","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Upper stem diameter and volume prediction strategies in the National Forest Inventory of Finland\",\"authors\":\"Virpi Stenman, Annika Kangas, Markus Holopainen\",\"doi\":\"10.14214/sf.23021\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In forest inventories, field data are needed for the prediction of tree volumes. However, gathering field data requires resources, such as labour, equipment, and data management operations. This means that time and budget, as well as quality, must be carefully considered when National Forest Inventory (NFI) field measurement activities are planned. Therefore, the development of cost efficient, simple, safe and reliable measurement methods and tools are of great interest. To date, upper stem diameter (d6), which provides a more reliable estimation of tree stem volume, has typically been measured with a parabolic calliper. In this study, the performance of the Criterion laser-based dendrometer was examined for d6 measurements. A total of 326 sample trees were measured multiple times with three different measurement instruments. These instruments were used to measure diameter at breast height (dbh) as well as d6 measurements. Bland-Altman plots and measurement error variances were used to determine measurement instrument reliability. For all trees, the standard deviation for the laser based dendrometer was 18.73 mm at dbh and 15.36 mm for the d6 measurements. When the performance of Criterion was analysed with reference to the mean value of repeated measurements, the standard deviation in the dbh measurements was 12.21 mm, and 8.88 mm in the d6 measurements.\",\"PeriodicalId\":49520,\"journal\":{\"name\":\"Silva Fennica\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2023-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Silva Fennica\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.14214/sf.23021\",\"RegionNum\":3,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"FORESTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Silva Fennica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.14214/sf.23021","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FORESTRY","Score":null,"Total":0}
引用次数: 0
摘要
在森林清查中,需要实地数据来预测树木的体积。然而,收集现场数据需要人力、设备和数据管理操作等资源。这意味着在规划国家森林清查(NFI)实地测量活动时,必须仔细考虑时间和预算以及质量。因此,开发经济高效、简单、安全可靠的测量方法和工具具有重要意义。迄今为止,茎上直径(d6)通常是用抛物面卡尺测量的,它提供了更可靠的树茎体积估计。在本研究中,对基于激光的Criterion树枝计的性能进行了d6测量。用三种不同的测量仪器对326棵样本树进行了多次测量。这些仪器用于测量胸高(dbh)直径以及d6测量。使用Bland-Altman图和测量误差方差来确定测量仪器的可靠性。对于所有树木,激光测树计的标准偏差为18.73 mm / dbh, d6测量值为15.36 mm。当参照重复测量的平均值分析Criterion的性能时,dbh测量的标准偏差为12.21 mm, d6测量的标准偏差为8.88 mm。
Upper stem diameter and volume prediction strategies in the National Forest Inventory of Finland
In forest inventories, field data are needed for the prediction of tree volumes. However, gathering field data requires resources, such as labour, equipment, and data management operations. This means that time and budget, as well as quality, must be carefully considered when National Forest Inventory (NFI) field measurement activities are planned. Therefore, the development of cost efficient, simple, safe and reliable measurement methods and tools are of great interest. To date, upper stem diameter (d6), which provides a more reliable estimation of tree stem volume, has typically been measured with a parabolic calliper. In this study, the performance of the Criterion laser-based dendrometer was examined for d6 measurements. A total of 326 sample trees were measured multiple times with three different measurement instruments. These instruments were used to measure diameter at breast height (dbh) as well as d6 measurements. Bland-Altman plots and measurement error variances were used to determine measurement instrument reliability. For all trees, the standard deviation for the laser based dendrometer was 18.73 mm at dbh and 15.36 mm for the d6 measurements. When the performance of Criterion was analysed with reference to the mean value of repeated measurements, the standard deviation in the dbh measurements was 12.21 mm, and 8.88 mm in the d6 measurements.
期刊介绍:
Silva Fennica publishes significant new knowledge on forest sciences. The scope covers research on forestry and forest ecosystems. Silva Fennica aims to increase understanding on forest ecosystems, and sustainable use and conservation of forest resources. Use of forest resources includes all aspects of forestry containing biomass-based and non-timber products, economic and social factors etc.