Elsevier

Remote Sensing of Environment

Volume 121, June 2012, Pages 196-209
Remote Sensing of Environment

Review
Lidar sampling for large-area forest characterization: A review

https://doi.org/10.1016/j.rse.2012.02.001Get rights and content
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Abstract

The ability to use digital remotely sensed data for forest inventory is often limited by the nature of the measures, which, with the exception of multi-angular or stereo observations, are largely insensitive to vertically distributed attributes. As a result, empirical estimates are typically made to characterize attributes such as height, volume, or biomass, with known asymptotic relationships as signal saturation occurs. Lidar (light detection and ranging) has emerged as a robust means to collect and subsequently characterize vertically distributed attributes. Lidar has been established as an appropriate data source for forest inventory purposes; however, large area monitoring and mapping activities with lidar remain challenging due to the logistics, costs, and data volumes involved.

The use of lidar as a sampling tool for large-area estimation may mitigate some or all of these problems. A number of factors drive, and are common to, the use of airborne profiling, airborne scanning, and spaceborne lidar systems as sampling tools for measuring and monitoring forest resources across areas that range in size from tens of thousands to millions of square kilometers. In this communication, we present the case for lidar sampling as a means to enable timely and robust large-area characterizations. We briefly outline the nature of different lidar systems and data, followed by the theoretical and statistical underpinnings for lidar sampling. Current applications are presented and the future potential of using lidar in an integrated sampling framework for large area ecosystem characterization and monitoring is presented. We also include recommendations regarding statistics, lidar sampling schemes, applications (including data integration and stratification), and subsequent information generation.

Highlights

►Lidar remote sensing fundamentals and applications in forest monitoring reviewed. ►The use of lidar for sample-based characterization of large areas reviewed. ►Background on need and utility of lidar sampling presented. ►Lidar systems and link to sampling of forests summarized. ►Recommendations made for operational and statistical considerations.

Keywords

Light detection and ranging
Lidar
Sampling
Extrapolation
Forest
Large area
Stratification
Satellite
Monitoring

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