How good is GLASOD?

Sonneveld, B.G.J.S.; Dent, David

doi:10.1016/j.jenvman.2007.09.008

Cited by 77 publications

(41 citation statements)

References 26 publications

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“…This is a remarkable result compared to earlier studies (e.g. Sonneveld & Dent, 2007;Sonneveld, 2003;Sonneveld & Albersen, 1999) where overall consistency of experts was moderate and cases with deviating assessments prevailed significantly over the few cases with identical scores. Yet, in the earlier mentioned studies individuals were asked about their opinion about land degradation while the WOCAT approach discusses these individual assessments in group sessions.…”

Section: Consistency Of Expert Judgmentssupporting

confidence: 37%

“…Third, a quantitative interpretation of these qualitative judgments can be obtained by relating ordered classes to measured observations on land degradation (e.g. soil loss); this relationship will define the qualitative class boundaries in the dimensions of the dependent variable (Sonneveld & Dent, 2007) providing quantitative interpretations to the qualitative classes.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Comparing Rainfall Use Efficiency Trends with Expert Judgments for Nation-Wide Land Degradation Assessments: The Case of Senegal

Sonneveld¹,

Bai²,

Ndiaye³

et al. 2012

JSD

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This study compares the results of two nationwide land degradation assessments for Senegal. The first approach is based on expert judgments, the second on trend analyses of Rainfall Use Efficiency (RUE). The comparison yields some interpretable results for extreme negative RUE slope values with maximum degrees of land degradation as indicated by experts, yet, overall, the correlation between both approaches proves to be low and without clear sign. As RUE trend analysis suffers from several inherent methodological problems and expert judgments are found to be consistent we consider expert opinions as the preferable option for a nation-wide land degradation assessment in Senegal. Yet, we argue that methodological improvements would increase the explanatory power of the expert approach and consolidate its position in a policy making framework.

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Section: Consistency Of Expert Judgmentssupporting

confidence: 37%

Section: Resultsmentioning

confidence: 99%

Comparing Rainfall Use Efficiency Trends with Expert Judgments for Nation-Wide Land Degradation Assessments: The Case of Senegal

Sonneveld¹,

Bai²,

Ndiaye³

et al. 2012

JSD

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“…GLASOD has also been quite useful in raising the attention of the extent and severity of soil degradation. Sonneveld and Dent (2009) assessed the accuracy of the GLASOD results, using some case studies in Africa. The study concluded that the GLASOD assessments were only moderately consistent with the actual data used to verify it.…”

Section: Global Assessment Of Human-induced Soil Degradation By the Imentioning

confidence: 99%

The Economics of Desertification, Land Degradation, and Drought Toward an Integrated Global Assessment

et al. 2011

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte.

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“…GLASOD collated the expert judgments of a number of soil scientists to produce a world map of human-induced soil degradation at a scale of 1:10,000,000. Using a uniform procedure, data were compiled on the status of soil degradation considering the type, extent, degree, rate and causes of degradation within physiographic units (Sonneveld and Dent 2009). The significance of GLASOD to global-scale soil erosion studies lies in the fact that it can be used as a validation set against which modelling results can be compared.…”

Section: Introductionmentioning

confidence: 99%

10-Daily soil erosion modelling over sub-Saharan Africa

Symeonakis

Drake

2009

Environ Monit Assess

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Soil erosion is considered to be one of the greatest environmental problems of sub-Saharan Africa. This paper investigates the advantages and disadvantages of modelling soil erosion at the continental scale and suggests an operational methodology for mapping and quantifying 10-daily water runoff and soil erosion over this scale using remote sensing data in a geographical information system framework. An attempt is made to compare the estimates of this study with general data on the severity of soil erosion over Africa and with measured rates of soil loss at different locations over the continent. The results show that the measured and estimated rates of erosion are in some areas very similar and in general within the same order of magnitude. The importance and the potential of using the soil erosion estimates with simple models and easily accessible free data for various continental-scale environmental applications are also demonstrated.

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How good is GLASOD?

Cited by 77 publications

References 26 publications

Comparing Rainfall Use Efficiency Trends with Expert Judgments for Nation-Wide Land Degradation Assessments: The Case of Senegal

Comparing Rainfall Use Efficiency Trends with Expert Judgments for Nation-Wide Land Degradation Assessments: The Case of Senegal

The Economics of Desertification, Land Degradation, and Drought Toward an Integrated Global Assessment

10-Daily soil erosion modelling over sub-Saharan Africa

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