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Keyword: lidar

The stability of mean wood specific gravity across stand age in US forests despite species turnover

Publications Posted on: September 14, 2019
Research Highlights: Estimates using measurements from a sample of approximately 132,000 field plots imply that while the species composition of US forests varies substantially across different age groups, the specific gravity of wood in those forests does not.

Statistical properties of hybrid estimators proposed for GEDI - NASA’s global ecosystem dynamics investigation

Publications Posted on: August 06, 2019
NASA’s Global Ecosystem Dynamics Investigation (GEDI) mission will collect waveform lidar data at a dense sample of ~25 m footprints along ground tracks paralleling the orbit of the International Space Station (ISS). GEDI’s primary science deliverable will be a 1 km grid of estimated mean aboveground biomass density (Mg ha-1), covering the latitudes overflown by ISS (51.6 ° S to 51.6 ° N).

A comparison of standard modeling techniques using digital aerial imagery with national elevation datasets and airborne LiDAR to predict size and density forest metrics in the Sapphire Mountains MT, USA

Publications Posted on: April 16, 2019
In recent years airborne Light Detection and Ranging (LiDAR) technology has received a great deal of attention. Using airborne LiDAR, analysts have successfully related height measurements to forest characteristics such as tree size, basal area, and number of trees.

Semi-automated delineation of stands in an even-age dominated forest: A LiDAR-GEOBIA two-stage evaluation strategy

Publications Posted on: April 09, 2019
Regional scale maps of homogeneous forest stands are valued by forest managers and are of interest for landscape and ecological modelling. Research focused on stand delineation has substantially increased in the last decade thanks to the development of Geographic Object Based Image Analysis (GEOBIA).

Transferability of lidar-derived basal area and stem density models within a northern Idaho ecoregion

Publications Posted on: December 14, 2018
A patchwork of disjunct lidar collections is rapidly developing across the USA, often acquired with different acquisition goals and parameters and without field data for forest inventory. Airborne lidar and coincident field data have been used to estimate forest attributes across individual lidar extents, where forest measurements are collected using project-specific inventory designs.

Use of lidar-derived landscape parameters to characterize alternative harvest system options in the Inland Northwest

Publications Posted on: November 21, 2018
As innovative harvest systems are developed, the extent to which they can be utilized on the landscape based on machine capabilities is often unclear to forest managers. Spatial decision support models may aid contractors and forest planners in choosing appropriate logging systems based on topography and stand characteristics.

Comparison of small- and large-footprint lidar characterization of tropical forest aboveground structure and biomass: A case study from Central Gabon

Publications Posted on: November 19, 2018
NASA’s Global Ecosystem Dynamic Investigation (GEDI) mission has been designed to measure forest structure using lidar waveforms to sample the earth’s vegetation while in orbit aboard the International Space Station. In this paper, we used airborne large-footprint (LF) lidar measurements to simulate GEDI observations from which we retrieved ground elevation, vegetation height, and aboveground biomass (AGB).

Taxonomic, functional, and phylogenetic diversity of bird assemblages are oppositely associated to productivity and heterogeneity in temperate forests

Publications Posted on: July 19, 2018
Conserving multiple facets of biodiversity is important for sustaining ecosystems. However, understanding relationships between faunal diversity and measurable ecosystem quantities, such as heterogeneity and productivity, across continental scales can be complicated by disparate methods.

Quantifying understory vegetation density using small-footprint airborne lidar

Publications Posted on: July 10, 2018
The ability to quantify understory vegetation structure in forested environments on a broad scale has the potential to greatly improve our understanding of wildlife habitats, nutrient cycling, wildland fire behavior, and wildland firefighter safety.

Carbon Monitoring System (CMS)

Projects Posted on: June 22, 2018
A historically consistent and broadly applicable monitoring, reporting, and verification system based on lidar sampling and Landsat time-series (tested in the US, and applied to the US NGHGI reporting system).