Crowdsourcing a City Manhole-cover Rubbing Map
井盖与城市纹理拓印的众包地图
标签：众包, 井盖纹样, 城市记忆, 开放档案
受日本"井盖卡"风潮启发的社区项目：参与者按统一规范拓取城市井盖、阀门盖与旧楼铜牌——A4 无酸卡纸、硬蜡笔斜握 45° 单向排涂，记录编号、坐标与环境照片上传共享档案。某市两年积累 600 余幅，标注出 1940 年代造币局原版与 1980 年代地方翻铸版的纹样差异，成为城市史研究素材。项目三条规则：只拓公共设施不拓私产、不用液态墨防污损路面、档案采用 CC BY-NC 许可便于非商业传播。
Inspired by Japan's manhole-card craze, a community project rubs covers, valve caps and old bronze plaques to one standard: A4 acid-free card, hard wax crayon held at 45°, single-direction strokes, with serial, coordinates and an environmental photo uploaded to a shared archive. One city logged 600-plus rubbings in two years, mapping 1940s mint originals against 1980s local recasts—material now used by urban historians. Three rules: public fixtures only, no liquid ink (it stains pavements), and a CC BY-NC licence for non-commercial sharing.