-The Forest Inventory and Analysis (FIA) Program of USDA Forest Service provide tree-level measurements from a systematic grid of field plots across all forest land uses and ownerships in the US. **FIAstemmap** is an R package for mapping tree stem locations on FIA plots, modeling individual crown dimensions, and generating plot-level estimates of fractional tree canopy cover. Several stand height metrics can be calculated. Spatial analysis of tree point pattern is facilitated for the standard FIA four-point cluster plot design. Efficient data processing supports national applications. The package provides an updated implementation of the software originally described by Toney et al. 2009 [[1]](#References). The original implementation for modeling plot canopy cover from individual tree measurements has supported several applications of FIA data, including:
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