Free, open, quantitative and adaptable digital soil map data and database for Nigeria

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dc.contributor.authorNkwunonwo UC
dc.contributor.authorOkeke FI
dc.contributor.authorEbinne ES
dc.contributor.authorChiemelu NE
dc.date.accessioned2022-07-23T10:38:05Z
dc.date.available2022-07-23T10:38:05Z
dc.date.issued2020
dc.descriptionData in Brief
dc.description.abstractNigeria's digital soil map (DSM) and database is the most comprehensive and detailed source of quantitative information on the country's soil distribution. Digital cartography and geographic information system (GIS) operations were methods used in producing the DSM and database. We obtained analogue soil data in 8 hard copy maps (each at a displayable scale of 1: 650,000) from the Federal Department of Agricultural Land Resources (FDALR), which archived the result of Nigeria's reconnaissance soil survey. The survey started in 1985 and by 1990; it has completed the compilation of hard copy maps that outline Nigeria's major soil distribution. Our experimental design begins with electronic scanning of these paper maps. We set the scanning system to 500 dpi, creating high-resolution raster images, which were imported into ESRI ArcGIS software, for orthorectification by geo-referencing to WGS 1984 geographic coordinate system. We applied a spatial processing tool on the orthorectified images and created a geometrically-seamless mosaicked raster image for the soil data of the whole Nigeria. Using GIS on-screen digitization – with optimal snapping tolerance – we created vector polygons (spatial data) of soil components (mapping units). Finally, we coded the metadata (attributes) of Nigeria's soil distribution into Microsoft EXCEL spreadsheet, which we linked to the soil spatial data. The combined spatial and attribute soil data forms the soil database for Nigeria and provides, on-demand, vital soil information, such as thematic maps of soil characteristics. The department of Geoinformatics and surveying University of Nigeria, Enugu Campus (UNEC) is the major repository of Nigeria's DSM and database.
dc.identifier.citation10.1016/j.dib.2020.105941
dc.identifier.issn2352-3409
dc.identifier.urihttps://nerd.ethesis.ng/handle/123456789/144
dc.language.isoen
dc.subjectDigital soil map
dc.subjectNigeria
dc.subjectLand resources
dc.subjectGeomorphology
dc.subjectSoil information
dc.subjectDigital cartography
dc.subjectGeographic information system
dc.subjectRaster
dc.titleFree, open, quantitative and adaptable digital soil map data and database for Nigeria
dc.typeArticle
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