Global Urban Network SVI Data

This data set contains street view segmentation indices for 50 global cities. We employ Meta's Mask2Former approach (Cheng, 2022) for image segmentation. <br> We obtain SVI from Mapillary which is the world's largest platform for free and open street view imagery (SVI). Till date, Mapillary's coverage has penetrated most global cities around the world. Compared to other proprietary options such as Google Street View, Mapillary images are hosted on a CC-BY-SA 4.0 licence, which allows users to freely share, use, and adapt images. <br> Images are subsampled proportionately based on geographic tiling of each city's administrative boundary and filtered to remove non-frontal facing and non-daylight images. <br> <br>本数据集涵盖全球50座城市的街景分割索引（street view segmentation indices）。我们采用Meta公司的Mask2Former方法（Cheng等，2022）完成图像分割任务。 我们从Mapillary平台获取街景影像（Street View Imagery，SVI），该平台是全球规模最大的免费开源街景影像平台。截至目前，Mapillary的影像覆盖范围已遍及全球多数城市。相较于谷歌街景（Google Street View）这类专有影像服务，Mapillary的影像采用CC-BY-SA 4.0许可协议发布，允许用户自由分享、使用并进行二次改编。 影像数据按照各城市行政边界的地理分块规则进行比例抽样，并经过筛选以移除非正面朝向及非日间拍摄的影像。