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).

尼日利亚数字土壤制图（DSM）数据及其土壤数据库，是对尼日利亚土壤类型、属性与空间分布的预测性或计算机辅助数字化表征。在这款新颖的DSM数据与土壤数据库中，源自1985年土壤概查的汇编纸质二手数据，被转换为矢量要素与符号，并以数据结构形式编码存储于地图版式之中。该DSM数据及其数据库以地理参考数值格式存储尼日利亚土壤相关信息，可基于尼日利亚境内的3个生态区、24个广义地貌单元与母质，定量且交互式地勾勒出58个土壤组分（土壤制图单元）。这些土壤制图单元的编号范围为‘1a’至‘24b’，可为利用尼日利亚DSM数据与数据库开展的环境建模与分析提供丰富的定量信息（详见文献[1]，其中完整列出了描述尼日利亚土壤分布及其空间差异的制图单元清单）。
该DSM系统及其数据库拥有极具特色的图例体系与灵活的比例尺，可基于点位精准的精度指标进行便捷更新，并保障数据安全。用户可快速生成空间土壤信息，为日益增长的高分辨率土壤数据需求提供充足解决方案，同时弥补了1990年FDALR纸质土壤地图在制图与定性分析方面的局限。该DSM集成了查询与空间分析工具，可针对尼日利亚语境下的基础土壤属性生成专题地图，包括土壤制图单元、地质（基底杂岩、玄武岩、砂岩、风成砂岩、页岩等）、土壤分类（美国农业部（USDA）与联合国粮食及农业组织（FAO）体系）、pH分级（酸性、碱性、中性等）以及生态区（湿地、雨林、稀树草原）。