Tanzania travel time to nearest health centre

Travel time surface was estimated using the cost allocation (friction surfaces) which used three primary input datasets on land surface characteristics that help or hinder travel speeds: land cover, roads and topography. This Geotiff is a 20-m spatial resolution surface where each pixel has a value which is the time in seconds to travel to the nearest health centre documented in the paper by Maina et al. (2020) doi: 10.1038/s41597-019-0142. According to the United Republic of Tanzania Ministry of Health and Social Welfare Health sector strategic plan (http://www.tzdpg.or.tz/fileadmin/documents/dpg_internal/dpg_working_groups_clusters/cluster_2/health/Key_Sector_Documents/Induction_Pack/Final_HSSP_IV_Vs1.0_260815.pdf) health centres are found at theward level they can admit patients and sometimes provide surgical services.

本研究通过成本分配法（摩擦表面法，cost allocation (friction surfaces)）估算出行时间表面（travel time surface），该方法依托三类核心地表特征输入数据集以表征其对出行速度的促进或阻碍作用，三类数据集分别为土地覆被、道路与地形。本数据集为空间分辨率20米的GeoTIFF（Geotiff）格式文件，每个像素的数值代表从该像素位置前往最近卫生中心所需的出行时长（单位：秒），相关研究细节已在Maina等人2020年发表的论文中予以说明，论文DOI为10.1038/s41597-019-0142。根据坦桑尼亚联合共和国卫生与社会福利部发布的《卫生部门战略规划》（访问链接：http://www.tzdpg.or.tz/fileadmin/documents/dpg_internal/dpg_working_groups_clusters/cluster_2/health/Key_Sector_Documents/Induction_Pack/Final_HSSP_IV_Vs1.0_260815.pdf），乡级（ward）行政区内设置的卫生中心可接收住院患者，部分机构还可提供外科诊疗服务。