Quality control tools greatly benefit map maintainers. The purpose of this tool is to find map features, in this case roads or paths, that have not been updated in a long time.

"Osmia" is a tool primarily to help mappers perform quality control analysis of OpenStreetMap data, and add missing data where it is required. Osmia's Obsolete Road Geometry function colours road lines and the line vertices increasingly red if they have not been edited recently. This highlights data that needs reviewing; due to improvements in the quality of aerial photography recently, the theory is that old data could be quite inaccurate. As far as I know, despite all the quality assurance tools available for mappers, none focus specifically on the temporality or recency of the data, so this is fairly novel. Additionally, there is a function that finds roads with no surface tags.

Previously, the only way to achieve this kind of data visualisation was through manually downloading and styling the vector data in QGIS. This tool fully automates this task in a computationally light, browser-based workflow.

Osmia hinges on the Nominatim and Overpass APIs to retrieve data easily. Openlayers is used for the slippy map and vector data styling.