Simultaneously acquired airborne laser scanning and multispectral imagery for individual tree species identification

look at this website Earlier this year a study investigating the use of multispectral imagery in addition to measurements from airborne laser scanning (ALS) for tree species identification was published in Canadian Journal of Remote Sensing. Multispectral imagery from a medium-format digital frame camera acquired simultaneously with ALS data were utilized and compared with imagery from a large-format digital frame camera acquired on a separate flight mission from a higher altitude. The two acquisitions represent cost efficient methods for data collection of both three-dimensional and spectral information. The classification accuracy was assessed using 1520 segmented spruce, pine, and deciduous trees. Furthermore, ALS intensity was normalized using the range from sensor to the target (range normalization). In addition, a source of variation in intensity known as banding, is described together with a normalization procedure for diminishing this effect. The normalized intensity was better than using the raw intensity, but it did not improve the classification compared with using only ALS structural information, which provided overall classification accuracies of 74%–77%. The combined use of ALS and multispectral imagery from the medium-format imagery acquired simultaneously and the separate acquisition of large-format imagery provided overall accuracies of 87%–89% and 83%–85%, respectively. Simultaneous acquisition of ALS and medium-format digital imagery provides an efficient data acquisition strategy for tree species identification in forest inventory and will likely reduce data acquisition costs by 10%–20%.

Reference

Estimating biomass in Hedmark County, Norway using national forest inventory field plots and airborne laserscanning

In a recent study published in Remote Sensing of Environment two sampling and estimation strategies for regional forest inventory were investigated in detail and results were presented for various geographical scales. Continue reading

Single tree detection in heterogeneous boreal forests using airborne laser scanning and area-based stem number estimates

A investigation of adaptive single tree detection methods using airborne laser scanning (ALS) data are published in International Journal of Remote Sensing (IJRS). Continue reading

Detection of small single trees in the forest–tundra ecotone using height values from airborne laser scanning

Introduction

Alpine and arctic tree lines are expected to advance to higher altitudes and further north due to global warming. Changes in temperature, precipitation, and snow coverage will affect numerous ecosystems and their interaction and forest ecosystems are expected to be highly affected by increasing temperatures, particularly in boreal regions. Continue reading