About cedejcarto.org Portal The CEDEJ map library is unique in Egypt: A multi-scalar collection of cadastral, topographic and geographic maps covering all of Egypt ranging from 1/500th to 1/1,000,000th scale. The oldest maps date from the end of the 19th century (insurance map of downtown Cairo) and the most recent ones from the end of the 1990s (the 1/50,000th series covering the Delta and the Nile Valley). These maps are useful to everyone for field studies, integration in master or thesis files or dissertations, comparison at different dates, etc. In order to facilitate the consultation of this map library, we are offering to the community of users an online management catalog, that is ergonomic, dynamic and interactive and allowing the access, the extraction and the exploration of textual and geo-referenced data. This work was carried out within the framework of open science. We carry an open data policy in strict compliance with the legislation and in the spirit of Plan S, namely "that data should be as open as possible and as closed as necessary" (https://scienceeurope.org)