Browsing by Author "Yemefack, Martin"

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    Soil legacy data rescue via GlobalSoilMap and other international and national initiatives
    (Elsevier, 2017-06-15) Arrouays, Dominique; Leenaars, Johan G. B.; Richer-de-Forges, Anne C.; Adhikari, Kabindra; Ballabio, Cristiano; Greve, Mogens; Grundy, Mike; Guerrero, Eliseo; Hempel, Jon; Hengl, Tomislav; Heuvelink, Gerard; Batjes, Niels; Carvalho, Eloi; Hartemink, Alfred; Hewitt, Alan; Hong, Suk-Young; Krasilnikov, Pavel; Lagacherie, Philippe; Lelyk, Glen; Libohova, Zamir; Lilly, Allan; McBratney, Alex; McKenzie, Neil; Vasquez, Gustavo M.; Mulder, Vera Leatitia; Minasny, Budiman; Montanarella, Luca; Odeh, Inakwu; Padarian, Jose; Poggio, Laura; Roudier, Pierre; Saby, Nicolas; Savin, Igor; Searle, Ross; Solbovoy, Vladimir; Thompson, James; Smith, Scott; Sulaeman, Yiyi; Vintila, Ruxandra; Viscarra Rossel, Raphael; Wilson, Peter; Zhang, Gan-Lin; Swerts, Martine; Oorts, Katrien; Karklins, Aldis; Feng, Liu; Ibelles Navarro, Alexandro R.; Levin, Arkadiy; Laktionova, Tetiana; Dell'Acqua, Martin; Suvannang, Nopmanee; Ruam, Waew; Prasad, Jagdish; Patil, Nitin; Husnjak, Stjepan; Pásztor, László; Okx, Joop; Hallett, Stephen H.; Keay, Caroline; Farewell, Timothy; Lilja, Harri; Juilleret, Jérôme; Marx, Simone; Takata, Yusuke; Kazuyuki, Yagi; Mansuy, Nicolas; Panagos, Panos; van Liedekerke, Mark; Skalsky, Rastislav; Sobocka, Jaroslava; Kobza, Josef; Eftekhari, Kamran; Kacem Alavipanah, Seyed; Moussadek, Rachid; Badraoui, Mohamed; Da Silva, Mayesse; Paterson, Garry; da Conceição Gonçalves, Maria; Theocharopoulos, Sid; Yemefack, Martin; Tedou, Silatsa; Vrscaj, Borut; Grob, Urs; Kozák, Josef; Boruvka, Lubos; Dobos, Endre; Taboada, Miguel; Moretti, Lucas; Rodriguez, Dario
    Legacy soil data have been produced over 70 years in nearly all countries of the world. Unfortunately, data, information and knowledge are still currently fragmented and at risk of getting lost if they remain in a paper format. To process this legacy data into consistent, spatially explicit and continuous global soil information, data are being rescued and compiled into databases. Thousands of soil survey reports and maps have been scanned and made available online. The soil profile data reported by these data sources have been captured and compiled into databases. The total number of soil profiles rescued in the selected countries is about 800,000. Currently, data for 117, 000 profiles are compiled and harmonized according to GlobalSoilMap specifications in a world level database (WoSIS). The results presented at the country level are likely to be an underestimate. The majority of soil data is still not rescued and this effort should be pursued. The data have been used to produce soil property maps. We discuss the pro and cons of top-down and bottom-up approaches to produce such maps and we stress their complementarity. We give examples of success stories. The first global soil property maps using rescued data were produced by a top-down approach and were released at a limited resolution of 1 km in 2014, followed by an update at a resolution of 250 m in 2017. By the end of 2020, we aim to deliver the first worldwide product that fully meets the GlobalSoilMap specifications.
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    Towards a harmonisation of the soil map of Africa at the continental scale
    (Elsevier, 2013-12-31T00:00:00Z) Dewitte, Olivier; Jones, Arwyn; Spaargaren, Otto; Breuning-Madsen, Henrik; Brossard, Michel; Dampha, Almami; Deckers, Jozef; Gallali, Tahar; Hallett, Stephen H.; Jones, Robert J. A.; Kilasara, Method; LeRoux, Pieter; Michéli, Erika; Montanarella, Luca; Thiombiano, Lamourdia; van Ranst, Eric; Yemefack, Martin; Zougmore, Robert
    In the context of major global environmental challenges such as food security, climate change, fresh water scarcity and biodiversity loss, the protection and the sustainable management of soil resources in Africa are of paramount importance. To raise the awareness of the general public, stakeholders, policy makers and the science community to the importance of soil in Africa, the Joint Research Centre of the European Commission has produced the Soil Atlas of Africa. To that end, a new harmonised soil map at the continental scale has been produced. The steps of the construction of the new area-class map are presented, the basic information being derived from the Harmonized World Soil Database (HWSD). We show how the original data were updated and modified according to the World Reference Base for Soil Resources classification system. The corrections concerned boundary issues, areas with no information, soil patterns, river and drainage networks, and dynamic features such as sand dunes, water bodies and coastlines. In comparison to the initial map derived from HWSD, the new map represents a correction of 13% of the soil data for the continent. The map is available for downloading.