Forest Inventory and Analysis (FIA) is a US Department of Agriculture Forest Service program that aims to monitor changes in forests across the US. FIA hosts one of the largest ecological datasets in the world, though its complexity limits access for many potential users. rFIA is an R package designed to simplify the estimation of forest attributes using data collected by the FIA Program. Specifically, rFIA improves access to the spatio-temporal estimation capacity of the FIA Database via space–time indexed summaries of forest variables within user-defined population boundaries (e.g., geographic, temporal, biophysical). The package implements multiple design-based estimators, and has been validated against official estimates and sampling errors produced by the FIA Program. We demonstrate the utility of rFIA by assessing changes in abundance and mortality rates of ash (Fraxinus spp.) populations in the Lower Peninsula of Michigan following the establishment of emerald ash borer (Agrilus planipennis).

森林清单和分析（FIA）是美国农业部林务局的一项计划，旨在监测全美国森林的变化。国际汽联拥有世界上最大的生态数据集之一，尽管其复杂性限制了许多潜在用户的访问权限。rFIA是一个R软件包，旨在使用FIA计划收集的数据简化对森林属性的估算。具体来说，rFIA通过用户定义的人口边界（例如地理，时间，生物物理）内森林变量的时空索引摘要，改善对FIA数据库的时空估计能力的访问。该程序包实现了多个基于设计的估算器，并且已针对国际汽联计划产生的官方估算和抽样误差进行了验证。我们展示的效用rFIA通过评估火山灰的丰度和死亡率的变化（白蜡属。）建立白蜡窄吉丁的（以下在密歇根下半岛的人口白蜡窄吉丁）。