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        <gco:CharacterString>Ce jeu de données rassemble les résultats du calcul d'indicateurs pouvant servir de seuils de détection d’anomalies en éléments traces (arsenic, cadmium, cobalt, chrome, cuivre, mercure, nickel, plomb, thallium, zinc) dans les sols de surface. Ces indicateurs correspondent à des vibrisses* calculées à partir d’un ensemble de mesures situées dans un rayon de 50 km autour du point considéré. Les mesures correspondent à des teneurs totales en éléments traces et proviennent des sites du Réseau de Mesures pour les horizons 0-30 cm (tous les éléments) et 30-50 cm (sauf pour l’arsenic et le Mercure).

On considère ici que ces calculs régionalisés des vibrisses jouent un rôle d'indicateur de tendance régionale prenant en compte à la fois les valeurs de fonds pédo-géochimiques et les apports d'origine anthropique. Elles correspondent à la teneur limite au-delà de laquelle une valeur peut être considérée comme anomalique. Elles permettent ainsi de détecter les anomalies ponctuelles tout en s'affranchissant de la valeur de fond locale. 

*La vibrisse (supérieure) d'un ensemble de valeurs d'une variable statistique est égale au 3ème quartile augmenté de 1,5 fois l'écart entre les 1ers et 3èmes quartiles.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#FR">Ce jeu de données rassemble les résultats du calcul d'indicateurs pouvant servir de seuils de détection d’anomalies en éléments traces (arsenic, cadmium, cobalt, chrome, cuivre, mercure, nickel, plomb, thallium, zinc) dans les sols de surface. Ces indicateurs correspondent à des vibrisses* calculées à partir d’un ensemble de mesures situées dans un rayon de 50 km autour du point considéré. Les mesures correspondent à des teneurs totales en éléments traces et proviennent des sites du Réseau de Mesures pour les horizons 0-30 cm (tous les éléments) et 30-50 cm (sauf pour l’arsenic et le Mercure).

On considère ici que ces calculs régionalisés des vibrisses jouent un rôle d'indicateur de tendance régionale prenant en compte à la fois les valeurs de fonds pédo-géochimiques et les apports d'origine anthropique. Elles correspondent à la teneur limite au-delà de laquelle une valeur peut être considérée comme anomalique. Elles permettent ainsi de détecter les anomalies ponctuelles tout en s'affranchissant de la valeur de fond locale. 

*La vibrisse (supérieure) d'un ensemble de valeurs d'une variable statistique est égale au 3ème quartile augmenté de 1,5 fois l'écart entre les 1ers et 3èmes quartiles.</gmd:LocalisedCharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">This dataset gathers the results of the calculation of indicators that can serve as detection thresholds for trace element anomalies (arsenic, cadmium, cobalt, chromium, copper, mercury, nickel, lead, thallium, zinc) in surface soils . These indicators correspond to vibrisses calculated from a set of measurements located within a radius of 50 km around the considered point. The measurements correspond to total contents of trace elements and come from the sites of the Network of Measurements for horizons 0-30 cm (all elements) and 30-50 cm (except for arsenic and Mercury).

We consider here that these regionalized calculations of the vibrisses play a role of indicator of regional tendency taking into account both the values ​​of pedo-geochemical bottoms and the contributions of anthropic origin. They correspond to the limit content beyond which a value can be considered as anomalous. They thus make it possible to detect punctual anomalies while avoiding the local background value.</gmd:LocalisedCharacterString>
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        <gco:CharacterString>Saby, Nicolas; Villanneau, E; Toutain, B; Arrouays, D., 2018, "Seuils de détection d’anomalies pour 8 éléments traces métalliques (RMQS)", https://doi.org/10.15454/UEZXBY, Portail Data Inra, V1</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#FR">Saby, Nicolas; Villanneau, E; Toutain, B; Arrouays, D., 2018, "Seuils de détection d’anomalies pour 8 éléments traces métalliques (RMQS)", https://doi.org/10.15454/UEZXBY, Portail Data Inra, V1</gmd:LocalisedCharacterString>
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            <gco:CharacterString>Les valeurs fournies sur les seuils de détection d’anomalie doivent être manipulée avec précaution. Les interprétations qui en sont faites doivent ainsi tenir compte du caractère assez frustres de ces indicateurs. En effet, il est important de noter que les calculs ne prennent pas en compte les processus pédologiques locaux.</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#FR">Les valeurs fournies sur les seuils de détection d’anomalie doivent être manipulée avec précaution. Les interprétations qui en sont faites doivent ainsi tenir compte du caractère assez frustres de ces indicateurs. En effet, il est important de noter que les calculs ne prennent pas en compte les processus pédologiques locaux.</gmd:LocalisedCharacterString>
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                <gmd:LocalisedCharacterString locale="#EN">The values provided on the anomaly detection thresholds must be handled with care. The interpretations that are made must take into account the rather frustrating nature of these indicators. Indeed, it is important to note that the calculations do not take into account local soil processes.</gmd:LocalisedCharacterString>
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                  <gmd:textGroup>
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                    <gmd:LocalisedCharacterString locale="#FR">Visualiser la carte du Cobalt à la profondeur 0-30 cm</gmd:LocalisedCharacterString>
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                <gco:CharacterString>Visualiser la carte du Cobalt à la profondeur 30-50 cm</gco:CharacterString>
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                  <gmd:textGroup>
                    <gmd:LocalisedCharacterString locale="#FR">Visualiser la carte du Cobalt à la profondeur 30-50 cm</gmd:LocalisedCharacterString>
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                  <gmd:textGroup>
                    <gmd:LocalisedCharacterString locale="#FR">Visualiser la carte du Chrome à la profondeur 30-50 cm</gmd:LocalisedCharacterString>
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            <gco:CharacterString>La plupart des étapes des calculs des vibrisses sont réalisées à l’aide de scripts exécutés dans le logiciel R (R Development Core Team, 2007).

La première étape est de calculer la distance entre les sites. Puis, une étape d’extraction, depuis la base de données, des concentrations en éléments traces pour chaque site est effectuée.

Les étapes suivantes sont réalisées par élément trace et par couche à l’aide d’un seul script R :
• Sélection, pour chaque site, des concentrations en éléments traces des sites voisins situés à une distance inférieure à 50 km,
• Décompte du nombre de concentrations en éléments traces sélectionnées par site et non-calcul de vibrisse lorsque ce décompte est inférieur à 10,
• Calcul, pour chaque site, de la vibrisse avec la formule suivante : v = médian + 3x l’écart interquartile.

Source : E. Villanneau, C. Perry-Giraud, N. Saby, C. Jolivet, F. Marot, D. Maton, A. Floch-Barneaud, V. Antoni et D. Arrouays, 2008. Détection de valeurs anomaliques d’éléments traces métalliques dans les sols à l’aide du Réseau de Mesure de la Qualité des Sols. Étude et Gestion des Sols, Volume 15,3, 2008 - pages 183 à 200</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#FR">La plupart des étapes des calculs des vibrisses sont réalisées à l’aide de scripts exécutés dans le logiciel R (R Development Core Team, 2007).

La première étape est de calculer la distance entre les sites. Puis, une étape d’extraction, depuis la base de données, des concentrations en éléments traces pour chaque site est effectuée.

Les étapes suivantes sont réalisées par élément trace et par couche à l’aide d’un seul script R :
• Sélection, pour chaque site, des concentrations en éléments traces des sites voisins situés à une distance inférieure à 50 km,
• Décompte du nombre de concentrations en éléments traces sélectionnées par site et non-calcul de vibrisse lorsque ce décompte est inférieur à 10,
• Calcul, pour chaque site, de la vibrisse avec la formule suivante : v = médian + 3x l’écart interquartile.

Source : E. Villanneau, C. Perry-Giraud, N. Saby, C. Jolivet, F. Marot, D. Maton, A. Floch-Barneaud, V. Antoni et D. Arrouays, 2008. Détection de valeurs anomaliques d’éléments traces métalliques dans les sols à l’aide du Réseau de Mesure de la Qualité des Sols. Étude et Gestion des Sols, Volume 15,3, 2008 - pages 183 à 200</gmd:LocalisedCharacterString>
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                <gmd:LocalisedCharacterString locale="#EN">Most of the steps for the calculation of the vibrisses are realized using scripts executed in the R software (R Development Core Team, 2007).

 The first step consists in calculating the distance between sites. Then, the trace elements concentrations are extracted from the database. 

The following steps are realized for each trace element and each layer with only one R script: 
• Selection, for each site, of the trace elements concentrations from the neighbouring sites within a distance of 50 km,
• Count the number of sites with a trace element concentration, the vibrisse calculation is done only of there are at least 10 sites, 
• Calculation, for each site, of the vibrisse with the following formula: v = median + 3x interquartile range.

Source: E. Villanneau, C. Perry-Giraud, N. Saby, C. Jolivet, F. Marot, D. Maton, A. Floch-Barneaud, V. Antoni et D. Arrouays, 2008. Détection de valeurs anomaliques d’éléments traces métalliques dans les sols à l’aide du Réseau de Mesure de la Qualité des Sols. Étude et Gestion des Sols, Volume 15,3, 2008 - pages 183 à 200</gmd:LocalisedCharacterString>
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