Hand-Drawn Annotation Dataset on OSM Basemaps for Sketch Map Digitisation

This dataset contains hand-drawn annotations on OpenStreetMap (OSM)-based basemaps for the study of automatic extraction of user-generated markings from sketch maps.

The dataset comprises approximately 2,300 annotated map images created during controlled data-curation rounds. Each sample represents a printed basemap that was manually annotated and subsequently scanned or photographed, resulting in realistic variations in image quality, illumination, and geometric distortions.

Annotations are provided as bounding boxes marking individual hand-drawn elements, including symbols, line segments, and text-like markings. The annotations were created using CVAT and follow a consistent labeling scheme across multiple annotators.

The dataset is designed to support research in object detection, change detection, and the digitisation of participatory sketch maps. It captures variability in drawing styles, stroke thicknesses, colours, and annotation placement, including partially overlapping and off-basemap markings.

Only OSM-based data and corresponding annotations are included in this release. Data derived from Esri World Imagery (EWI) is excluded due to licensing restrictions. Synthetic data used in the associated study is not included, as it is partially derived from non-redistributable sources.

本数据集包含基于开放街道地图（OpenStreetMap，简称OSM）的底图手绘标注，用于开展从草图地图中自动提取用户生成标记的相关研究。
本数据集包含约2300张经标注的地图图像，均生成于受控数据整理流程中。每一样本均为经人工标注后的印刷底图，后续通过扫描或拍摄获取图像，因此图像质量、光照条件与几何畸变均存在符合真实场景的差异。
标注以边界框形式呈现，用于标记各类手绘元素，包括符号、线段以及类文本标记。本次标注使用CVAT完成，且多位标注员均遵循统一的标注规范。
本数据集旨在为目标检测、变化检测以及参与式草图地图数字化的相关研究提供支撑。该数据集涵盖了绘图风格、笔触粗细、色彩以及标注位置的各类差异，包括部分重叠的标记以及位于底图之外的标注。
本次发布仅包含基于OSM的底图数据及其对应的标注。源自Esri世界影像（Esri World Imagery，简称EWI）的数据因授权限制未被纳入。相关研究中使用的合成数据因部分源自不可再分发的数据源，故未包含在本次发布中。