Global Roads Open Access Data Set, Version 1 (gROADSv1)

The Global Roads Open Access Data Set, Version 1 (gROADSv1) was developed under the auspices of the CODATA Global Roads Data Development Task Group. The data set combines the best available roads data by country into a global roads coverage, using the UN Spatial Data Infrastructure Transport (UNSDI-T) version 2 as a common data model. All country road networks have been joined topologically at the borders, and many countries have been edited for internal topology. Source data for each country are provided in the documentation, and users are encouraged to refer to the readme file for use constraints that apply to a small number of countries. Because the data are compiled from multiple sources, the date range for road network representations ranges from the 1980s to 2010 depending on the country (most countries have no confirmed date), and spatial accuracy varies. The baseline global data set was compiled by the Information Technology Outreach Services (ITOS) of the University of Georgia. Updated data for 27 countries and 6 smaller geographic entities were assembled by Columbia University's Center for International Earth Science Information Network (CIESIN), with a focus largely on developing countries with the poorest data coverage.

全球道路开放获取数据集第1版（gROADSv1）由国际科学技术数据委员会（CODATA）全球道路数据开发任务组支持研发。该数据集以联合国空间数据基础设施交通框架（UNSDI-T）第2版作为通用数据模型，将各国现有最优道路数据整合为全球道路覆盖数据集。所有国家的道路路网均已在国界处完成拓扑拼接，且多数国家的内部路网拓扑结构已完成修订优化。各国道路的源数据均随配套文档一并提供，同时建议用户参阅自述文件，以了解适用于少数国家的使用限制条款。由于该数据集整合自多源数据，不同国家的道路路网数据采集时间跨度介于20世纪80年代至2010年之间（多数国家未确认具体采集日期），且空间精度存在差异。基础版全球数据集由美国佐治亚大学信息技术推广服务部（ITOS）编制。针对27个国家及6个小型地理实体的更新数据集由哥伦比亚大学国际地球科学信息网络中心（CIESIN）完成整合，其重点覆盖数据覆盖度最差的发展中国家。