ISBN-13: 9781505814217 / Angielski / Miękka / 2015 / 86 str.
The Forest Inventory and Analysis program of the U.S. Forest Service collects vast amounts of filed data to assess the condition and trends the nation's forest resources. A quality assurance program is implemented to assure that data are collected accurately with consistent protocols. A random subset of field plots is chosen to receive an additional, independent measurement by another field crew.