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DOI | 10.1016/j.jag.2018.10.021 |
Limitations of high resolution satellite stereo imagery for estimating canopy height in Australian tropical savannas | |
Goldbergs G.; Maier S.W.; Levick S.R.; Edwards A. | |
发表日期 | 2019 |
ISSN | 15698432 |
起始页码 | 83 |
结束页码 | 95 |
卷号 | 75 |
英文摘要 | 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. Our results showed that stereo dense matching using the SGM technique severely underestimates tree presence and canopy height. The highest tree detection rates were achieved by using the near-infrared (NIR) band of GE1 (8–9%). WV1-GE1 cross-satellite (mixed) models did not improve the quality of extracted canopy heights. We consider these poor detection rates and height retrievals to result from: i) the clumping crown structure of the dominant Eucalyptus spp.; ii) their vertically oriented leaves (affecting the bidirectional reflectance distribution function); iii) image band radiometry and iv) wind induced crown movement affecting stereo-pair point matching. Our detailed analyses suggest that current commercially available VHR satellite data (0.5 m resolution) are not well suited to estimating canopy height variables, and therefore above ground biomass (AGB), in Eucalyptus dominated north Australian tropical savanna woodlands. © 2018 Elsevier B.V. |
英文关键词 | Canopy height; Satellite; Savanna; Stereo |
语种 | 英语 |
scopus关键词 | canopy; GeoEye; image resolution; satellite imagery; savanna; stereo image; tropical environment; WorldView; Australia; Eucalyptus |
来源期刊 | International Journal of Applied Earth Observation and Geoinformation
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/156541 |
作者单位 | Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT 0909, Australia; Maitec, Charles Darwin University, PO Box U19NT 0815, Australia; College of Science and Engineering, James Cook University, Macgregor Road, Smithfield, Qld 4870, Australia; CSIRO Land and Water, PMB 44, Winnellie, NT 0822, Australia; Darwin Centre for Bushfire Research, Charles Darwin University, Darwin, NT 0909, Australia |
推荐引用方式 GB/T 7714 | Goldbergs G.,Maier S.W.,Levick S.R.,et al. Limitations of high resolution satellite stereo imagery for estimating canopy height in Australian tropical savannas[J],2019,75. |
APA | Goldbergs G.,Maier S.W.,Levick S.R.,&Edwards A..(2019).Limitations of high resolution satellite stereo imagery for estimating canopy height in Australian tropical savannas.International Journal of Applied Earth Observation and Geoinformation,75. |
MLA | Goldbergs G.,et al."Limitations of high resolution satellite stereo imagery for estimating canopy height in Australian tropical savannas".International Journal of Applied Earth Observation and Geoinformation 75(2019). |
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