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（gROADSv1）是在CODATA全球道路数据发展工作组的支持下开发的。该数据集通过整合各国最优质的道路数据，构建了全球道路覆盖范围，其中采用了联合国空间数据基础设施运输（UNSDI-T）版本2作为通用数据模型。所有国家的道路网络在边境处进行了拓扑连接，许多国家的内部拓扑结构也进行了编辑。每个国家的源数据均包含在文档中，并鼓励用户参考readme文件了解适用于少数国家的使用限制。由于数据来源于多个渠道，道路网络表示的时间范围从20世纪80年代至2010年不等，具体取决于国家（大多数国家没有确切的日期），空间精度也各有差异。基线全球数据集由乔治亚大学的信息技术外联服务（ITOS）编制。哥伦比亚大学国际地球科学信息网络中心（CIESIN）汇编了27个国家和6个较小地理实体的更新数据，重点主要针对数据覆盖最薄弱的发展中国家。