Limitations of high resolution satellite stereo imagery for estimating canopy Check for height in Australian tropical savannas

Goldbergs, Grigorijs ¹Maier, Stefan W. ²Levick, Shaun R. ¹Edwards, Andrew³

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作者信息

1. Charles Darwin Univ, Res Inst Environm & Livelihoods, Darwin, NT 0909, Australia
2. Charles Darwin Univ, Maitec, POB U19, Darwin, NT 0815, Australia
3. Charles Darwin Univ, Darwin Ctr Bushfire Res, Darwin, NT 0909, Australia
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Abstract

Obtaining reliable measures of tree canopy height across large areas is a central element of forest inventory and carbon accounting. Recent years have seen an increased emphasis on the use of active sensors like Radar and airborne LiDAR (light detection and scanning) systems to estimate various 3D characteristics of canopy and crown structure that can be used as predictors of biomass. However, airborne LiDAR data are expensive to acquire, and not often readily available across large remote landscapes. In this study, we evaluated the potential of stereo imagery from commercially available Very High Resolution (VHR) satellites as an alternative for estimating canopy height variables in Australian tropical savannas, using a semi-global dense matching (SGM) image-based technique. We assessed and compared the completeness and vertical accuracy of extracted canopy height models (CHMs) from GeoEye 1 and WorldView 1 VHR satellite stereo pairs and summarised the factors influencing image matching effectiveness and quality.

Key words

Stereo/Satellite/Canopy height/Savanna

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出版年

2019

International journal of applied earth observation and geoinformation

SCI

ISSN：0303-2434

被引量9

参考文献量45

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