A map of agricultural systems in Africa by 1800

Illustrations, maps and GIS-files of the following articleWidgren Mats: Agriculture in sub-Saharan Africa by 1800: a map and a gazetteer. In Mercuri, A.M., D'Andrea, A.C., Fornaciari, R., Höhn, A. (eds.): Plants and People in the African Past - Progress in African Archaeobotany (in press), SPRINGER The GIS-files can be opened with GIS programmes such as QGIS (open source) or ArcGIS. Note that they have to overlayered with coastlines (and lakes, depending on scale).If you use the data: please refer to the article.AbstractRecent global
historical cropland modelling grossly underestimates the pre-colonial
development of agriculture in the Americas and many parts of sub-Saharan
Africa. Such models are usually developed from backcasting from recent land
cover combined with environmentally deterministic algorithms. Historical
geographers have been slow in responding to this new demand for a global
synthesis. Here a a
preliminary map of African agricultural systems by 1800 AD is presented. It
forms part of the project Mapping Global Agriculture and is based on the
existing historical literature, observations by early travellers, archaeology
and archaeobotany. Its preliminary nature must be emphasized.

配套于以下论文的插图、地图与地理信息系统（GIS）文件：作者为Widgren Mats，题为《1800年以前的撒哈拉以南非洲农业：一份地图与地名辞典（gazetteer）》。该论文收录于Mercuri、D'Andrea、Fornaciari与Höhn主编的《非洲过往的植物与人类——非洲考古植物学（archaeobotany）研究进展》（待出版），由施普林格（Springer）出版社出版。
该GIS文件可通过QGIS（开源软件）、ArcGIS等地理信息系统程序打开，请注意需将其与海岸线（根据比例尺不同，还需叠加湖泊图层）进行叠加。若使用本数据集，请引用该论文。
摘要：当前主流的全球历史耕地模型，严重低估了美洲与撒哈拉以南非洲诸多区域在前殖民时期的农业发展水平。此类模型通常基于近期土地覆盖数据的回溯推演（backcasting），并结合环境决定论算法构建。历史地理学界对这种全球综合研究的新需求响应迟缓。本文呈现一份公元1800年前后非洲农业系统的初步地图，该地图是全球农业制图（Mapping Global Agriculture）项目的组成部分，其数据基于现有历史文献、早期旅行者观测记录、考古学与考古植物学研究成果。需特别说明，本研究成果仍处于初步阶段。