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Keyword: estimation

A GIS-based tool for estimating tree canopy cover on fixed-radius plots using high-resolution aerial imagery

Publications Posted on: February 05, 2013
Recent changes to the Forest Inventory and Analysis (FIA) Program's definition of forest land precipitated the development of a geographic information system (GIS)-based tool for efficiently estimating tree canopy cover for all FIA plots. The FIA definition of forest land has shifted from a density-related criterion based on stocking to a 10 percent tree canopy cover threshold.

Technical aspects of the forest carbon inventory of the United States: recent past and near future

Publications Posted on: February 05, 2013
The Forest Inventory and Analysis program of the U.S. Forest Service has explicitly assumed responsibility for providing an inventory of the U.S. forests' carbon stocks and stock change to the U.S. Environmental Protection Agency for numerous years to meet obligations to the United Nations Framework Convention on Climate Change. Recent improvements, plans for the future, and implications regarding use of the U.S.

Adding value to the FIA inventory: combining FIA data and satellite observations to estimate forest disturbance

Publications Posted on: February 05, 2013
In addition to being one of the primary drivers of the net terrestrial carbon budget, forest disturbance also plays a critical role in regulating the surface energy balance, promoting biodiversity, and creating wildlife habitat.

Improving automated disturbance maps using snow-covered landsat time series stacks

Publications Posted on: February 04, 2013
Snow-covered winter Landsat time series stacks are used to develop a nonforest mask to enhance automated disturbance maps produced by the Vegetation Change Tracker (VCT). This method exploits the enhanced spectral separability between forested and nonforested areas that occurs with sufficient snow cover. This method resulted in significant improvements in Vegetation Change Tracker outputs at the 95 percent confidence interval.

Understanding trends in observations of forest disturbance and their underlying causal processes

Publications Posted on: February 04, 2013
Estimates of forest canopy areal extent, configuration, and change have been developed from satellite-based imagery and ground-based inventories to improve understanding of forest dynamics and how they interact with other Earth systems across many scales.

Projected trends in forest habitat classes under climate and land-use change scenarios

Publications Posted on: February 04, 2013
Wildlife species have diverse and sometimes conflicting habitat requirements. To support diverse wildlife communities, natural resource managers need to manage for a variety of habitats across a large area and to create long-term management plans to ensure this variety is maintained. In these efforts, managers would benefit from assessments of potential climate and land use change effects on habitats. As part of the U.S.

Expansion and contraction tension zones in western pinon-juniper woodlands under projected climate change

Publications Posted on: February 04, 2013
Populations of pinons and junipers across the interior west have been highly dynamic over the last two centuries, undergoing an overall expansion but punctuated with regional mortality. Accumulating demographic studies across the interior west indicate the drivers of expansion and contraction of populations are compounded by regional land use legacies, but have an underlying climatic component.

Emerald ash borer modeling methods for future forest projections

Publications Posted on: February 04, 2013
The emerald ash borer (Agrilus planipennis Fairmaire; EAB) is a nonnative invasive insect that has caused considerable damage to ash (Fraxinus spp.) in North America. Unlike invasive organisms that can be mitigated, contained, controlled, or even eradicated, EAB continues to spread across North America.

Unlocking the climate riddle in forested ecosystems

Publications Posted on: February 04, 2013
Climate information is often used as a predictor in ecological studies, where temporal averages are typically based on climate normals (30-year means) or seasonal averages. While ensemble projections of future climate forecast a higher global average annual temperature, they also predict increased climate variability.

Investigating Forest Inventory and Analysis-collected tree-ring data from Utah as a proxy for historical climate

Publications Posted on: February 04, 2013
Increment cores collected as part of the periodic inventory in the Intermountain West were examined for their potential to represent growth and be a proxy for climate (precipitation) over a large region (Utah). Standardized and crossdated time-series created from pinyon pine (n=249) and Douglas-fir (n=274) increment cores displayed spatiotemporal patterns in growth differences both between species and by region within Utah.

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