Evidence map›Paper›PMID 32917875›Full record

ArticleNature communications2020

Spatial validation reveals poor predictive performance of large-scale ecological mapping models.

Pierre Ploton, Frédéric Mortier, Maxime Réjou-Méchain, Nicolas Barbier, Nicolas Picard, Vivien Rossi, Carsten Dormann, Guillaume Cornu, Gaëlle Viennois, Nicolas Bayol and 3 more

Abstract read
In one paragraph

Article in Nature communications, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 115 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
115citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

115 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  10. Using resurvey data to predict changes in ecosystem functioning across protected and unprotected coastal dunes.Conservation biology : the journal of the Society for Conservation Biology · 2026
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  17. A cloud-computing framework for downscaled global 300 m SIF retrieval from Sentinel-3 and TROPOSIF.International journal of applied earth observation and geoinformation : ITC journal · 2026
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55 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Pierre PlotonAMAP, Univ Montpellier, IRD, CNRS, INRAE, CIRAD, Montpellier, France. p.ploton@gmail.com.ORCID http://orcid.org/0000-0002-8800-3593
Frédéric MortierCIRAD, UPR Forêts et Sociétés, F-34398, Montpellier, France.ORCID http://orcid.org/0000-0001-5473-709X
Maxime Réjou-MéchainAMAP, Univ Montpellier, IRD, CNRS, INRAE, CIRAD, Montpellier, France.
Nicolas BarbierAMAP, Univ Montpellier, IRD, CNRS, INRAE, CIRAD, Montpellier, France.ORCID http://orcid.org/0000-0002-5323-3866
Nicolas PicardVia della Sforzesca 1, 00185, Rome, Italy.
Vivien RossiCIRAD, UPR Forêts et Sociétés, Yaoundé, Cameroon.ORCID http://orcid.org/0000-0001-5458-1523
Carsten DormannBiometry and Environmental System Analysis, University of Freiburg, Freiburg im Breisgau, Germany.ORCID http://orcid.org/0000-0002-9835-1794
Guillaume CornuCIRAD, UPR Forêts et Sociétés, F-34398, Montpellier, France.ORCID http://orcid.org/0000-0002-7523-5176
Gaëlle ViennoisAMAP, Univ Montpellier, IRD, CNRS, INRAE, CIRAD, Montpellier, France.
Nicolas BayolForêt Ressources Management Ingénierie, 34130, Mauguio, Grand Montpellier, France.
Alexei LyapustinNASA Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA.
Sylvie Gourlet-FleuryCIRAD, UPR Forêts et Sociétés, F-34398, Montpellier, France.ORCID http://orcid.org/0000-0002-1136-4307
Raphaël PélissierAMAP, Univ Montpellier, IRD, CNRS, INRAE, CIRAD, Montpellier, France.ORCID http://orcid.org/0000-0003-4845-5090

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Mapping aboveground forest biomass is central for assessing the global carbon balance. However, current large-scale maps show strong disparities, despite good validation statistics of their underlying models. Here, we attribute this contradiction to a flaw in the validation methods, which ignore spatial autocorrelation (SAC) in data, leading to overoptimistic assessment of model predictive power. To illustrate this issue, we reproduce the approach of large-scale mapping studies using a massive forest inventory dataset of 11.8 million trees in central Africa to train and validate a random forest model based on multispectral and environmental variables. A standard nonspatial validation method suggests that the model predicts more than half of the forest biomass variation, while spatial validation methods accounting for SAC reveal quasi-null predictive power. This study underscores how a common practice in big data mapping studies shows an apparent high predictive power, even when predictors have poor relationships with the ecological variable of interest, thus possibly leading to erroneous maps and interpretations.

Identifiers

PMID32917875
PMCPMC7486894

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.