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

Nigeria’s DSM data and soil database of Nigeria is a predictive or computer-assisted digital depiction of Nigeria’s soil types, properties and spatial distribution. In this novel DSM data and soil database, secondary data in the form of compiled hard copies, derived from the 1985 reconnaissance soil survey are transformed into vectors and symbols encoded and held as data structures within the map layout. The DSM data and its database hold information relating to the Nigerian soil in geographically referenced numerical format. Thus, it delineates quantitatively and interactively the 58 soil components (soil mapping units), based on three ecological zones, twenty-four broad geomorphic units and parent materials in Nigeria. These soil mapping units are numbered from ‘1a’ to ‘24b’ and provides much quantitative information for environmental modelling and analyses using the Nigeria’s DSM data and database (Refer to [1] for a full list of the mapping units that describes the Nigeria’s soil distribution and their spatial distinctions).
This DSM and its database have a highly unique legend with flexible scales, are easy to update with location-specific measure of accuracy, and guarantees data security. Users can quickly generate spatial soil information that provides ample solutions to the growing demand for high-resolution soil data. This solves the cartographic and qualitative limitations of the 1990 FDALR hard copy soil maps. The DSM incorporates queries and spatial analyses tools to generate thematic maps of basic soil properties within the context of Nigeria such as soil mapping unit, geology (basement complex, basalt, sandstone, Aeolian sandstone, shale, etcetera), soil classification (USDA and FAO), pH scales (acidic, basic, neutral, etcetera) and ecological zones (wetland, rainforest, savanna).

尼日利亚的数字土壤制图（DSM）数据及土壤数据库是对尼日利亚土壤类型、特性及其空间分布的预测性或计算机辅助数字化描述。在此新颖的DSM数据及土壤数据库中，1985年侦察土壤调查所形成的次级数据，以编纂的硬拷贝形式呈现，被转化为矢量符号，并作为数据结构存储于地图布局中。DSM数据及其数据库以地理参考的数值格式保存了与尼日利亚土壤相关的信息。因此，它定量且交互式地界定了基于三个生态区、二十四项广义地貌单元以及母质在尼日利亚的58种土壤成分（土壤制图单元）。这些土壤制图单元编号从‘1a’至‘24b’，为利用尼日利亚的DSM数据和数据库进行环境建模与分析提供了大量定量信息（具体制图单元及其描述尼日利亚土壤分布和空间差异的完整列表，请参阅[1]）。该DSM及其数据库拥有一套独特且灵活的图例，易于根据特定位置的精确度进行更新，并保障数据安全。用户能够迅速生成空间土壤信息，满足对高分辨率土壤数据日益增长的需求。这解决了1990年FDALR硬拷贝土壤图在制图和定性方面的局限性。DSM整合了查询和空间分析工具，可在尼日利亚的背景下生成基本土壤特性的专题地图，如土壤制图单元、地质（基底复杂结构、玄武岩、砂岩、风成砂岩、页岩等）、土壤分类（美国农业部和美国粮农组织分类）、pH值尺度（酸性、碱性、中性等）以及生态区（湿地、雨林、稀树草原）等。