OSM (OpenStreetMap) is a collaborative project to create a free editable map of the world and Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Based on OSM (OpenStreetMap) and Leaflet, a complete off-line map is constructed in this paper and applied to the actual emergency logistics project, which reduces the dependence of the open source map on the network and improves the security of the system.
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