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Research article - Peer-reviewed, 2011

Model-based inference for biomass estimation in a LiDAR sample survey in Hedmark County, Norway

Ståhl, Göran; Holm, Sören; Gregoire, Timothy G.; Gobakken, Terje; Næsset, Erik; Nelson, Ross

Abstract

In forest inventories, regression models are often applied to predict quantities such as biomass at the level of sampling units. In this paper, we propose a model-based inference framework for combining sampling and model errors in the variance estimation. It was applied to airborne laser (LiDAR) data sets from Hedmark County, Norway, where the model error proportion of the total variance was found to be large for both scanning (airborne laser scanning) and profiling LiDAR when biomass was estimated. With profiling LiDAR, the model error variance component for the entire county was as large as 71% whereas for airborne laser scanning, it was 43% of the total variance. Partly, this reflects the better accuracy of the pixel-based regression models estimated from scanner data as compared with the models estimated from profiler data. The framework proposed in our study can be applied in all types of sample surveys where model-based predictions are made at the level of individual sampling units. Especially, it should be useful in cases where model-assisted inference cannot be applied due to the lack of a probability sample from the target population or due to problems of correctly matching observations of auxiliary and target variables.

Published in

Canadian Journal of Forest Research
2011, volume: 41, number: 1, pages: 96-107
Publisher: CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS

Authors' information

Swedish University of Agricultural Sciences, Department of Forest Resource Management
Swedish University of Agricultural Sciences, Department of Forest Resource Management
Gregoire, Timothy G.
School of Forestry and Environmental Studies
Gobakken, Terje
Norwegian University of Life Sciences (NMBU)
Næsset, Erik
Norwegian University of Life Sciences (NMBU)
Nelson, Ross
NASA Goddard Institute for Space Studies

UKÄ Subject classification

Forest Science

Publication Identifiers

DOI: https://doi.org/10.1139/X10-161

URI (permanent link to this page)

https://res.slu.se/id/publ/58906