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  A comprehensive framework for assessing the accuracy and uncertainty of global above-ground biomass maps

Araza, A., de Bruin, S., Herold, M., Quegan, S., Labriere, N., Rodriguez-Veiga, P., Avitabile, V., Santoro, M., Mitchard, E. T., Ryan, C. M., Phillips, O. L., Willcock, S., Verbeeck, H., Carreiras, J., Hein, L., Schelhaas, M.-J., Pacheco-Pascagaza, A. M., da Conceição Bispo, P., Laurin, G. V., Vieilledent, G., Slik, F., Wijaya, A., Lewis, S. L., Morel, A., Liang, J., Sukhdeo, H., Schepaschenko, D., Cavlovic, J., Gilani, H., Lucas, R. (2022): A comprehensive framework for assessing the accuracy and uncertainty of global above-ground biomass maps. - Remote Sensing of Environment, 272, 112917.
https://doi.org/10.1016/j.rse.2022.112917

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 Creators:
Araza, Arnan1, Author
de Bruin, Sytze1, Author
Herold, Martin2, Author              
Quegan, Shaun1, Author
Labriere, Nicolas1, Author
Rodriguez-Veiga, Pedro1, Author
Avitabile, Valerio1, Author
Santoro, Maurizio1, Author
Mitchard, Edward T.A.1, Author
Ryan, Casey M.1, Author
Phillips, Oliver L.1, Author
Willcock, Simon1, Author
Verbeeck, Hans1, Author
Carreiras, Joao1, Author
Hein, Lars1, Author
Schelhaas, Mart-Jan1, Author
Pacheco-Pascagaza, Ana Maria1, Author
da Conceição Bispo, Polyanna1, Author
Laurin, Gaia Vaglio1, Author
Vieilledent, Ghislain1, Author
Slik, Ferry1, AuthorWijaya, Arief1, AuthorLewis, Simon L.1, AuthorMorel, Alexandra1, AuthorLiang, Jingjing1, AuthorSukhdeo, Hansrajie1, AuthorSchepaschenko, Dmitry1, AuthorCavlovic, Jura1, AuthorGilani, Hammad1, AuthorLucas, Richard1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
21.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146028              

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Free keywords: AGB; Carbon cycle; Map validation; Uncertainty assessment; Remote sensing
 Abstract: Over the past decade, several global maps of above-ground biomass (AGB) have been produced, but they exhibit significant differences that reduce their value for climate and carbon cycle modelling, and also for national estimates of forest carbon stocks and their changes. The number of such maps is anticipated to increase because of new satellite missions dedicated to measuring AGB. Objective and consistent methods to estimate the accuracy and uncertainty of AGB maps are therefore urgently needed. This paper develops and demonstrates a framework aimed at achieving this. The framework provides a means to compare AGB maps with AGB estimates from a global collection of National Forest Inventories and research plots that accounts for the uncertainty of plot AGB errors. This uncertainty depends strongly on plot size, and is dominated by the combined errors from tree measurements and allometric models (inter-quartile range of their standard deviation (SD) = 30–151 Mg ha−1). Estimates of sampling errors are also important, especially in the most common case where plots are smaller than map pixels (SD = 16–44 Mg ha−1). Plot uncertainty estimates are used to calculate the minimum-variance linear unbiased estimates of the mean forest AGB when averaged to 0.1∘. These are used to assess four AGB maps: Baccini (2000), GEOCARBON (2008), GlobBiomass (2010) and CCI Biomass (2017). Map bias, estimated using the differences between the plot and 0.1∘ map averages, is modelled using random forest regression driven by variables shown to affect the map estimates. The bias model is particularly sensitive to the map estimate of AGB and tree cover, and exhibits strong regional biases. Variograms indicate that AGB map errors have map-specific spatial correlation up to a range of 50–104 km, which increases the variance of spatially aggregated AGB map estimates compared to when pixel errors are independent. After bias adjustment, total pantropical AGB and its associated SD are derived for the four map epochs. This total becomes closer to the value estimated by the Forest Resources Assessment after every epoch and shows a similar decrease. The framework is applicable to both local and global-scale analysis, and is available at https://github.com/arnanaraza/PlotToMap. Our study therefore constitutes a major step towards improved AGB map validation and improvement.

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Language(s): eng - English
 Dates: 20222022
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.rse.2022.112917
GFZPOF: p4 T5 Future Landscapes
OATYPE: Hybrid Open Access
 Degree: -

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Title: Remote Sensing of Environment
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 272 Sequence Number: 112917 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals427
Publisher: Elsevier