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OpenStreetMap ( OSM) is a free, open geographic database updated and maintained by a community of volunteers via open collaboration. Contributors collect data from surveys, trace from aerial imagery and also import from other freely licensed geodata sources. OpenStreetMap is freely licensed under the Open Database License and as a result ...
Open and closed maps. In mathematics, more specifically in topology, an open map is a function between two topological spaces that maps open sets to open sets. [1] [2] [3] That is, a function is open if for any open set in the image is open in Likewise, a closed map is a function that maps closed sets to closed sets.
An Android app for My Maps, initially released in March 2013 under the name Google Maps Engine Lite, was available until its removal from the Play Store in October 2021. Google Local Guides. Google Local Guides is a volunteer program launched by Google Maps to enable users to contribute to Google Maps when registered. It sometimes provides them ...
In functional analysis, the open mapping theorem, also known as the Banach–Schauder theorem or the Banach theorem [1] (named after Stefan Banach and Juliusz Schauder ), is a fundamental result that states that if a bounded or continuous linear operator between Banach spaces is surjective then it is an open map .
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Properties. Every continuous map from a compact space to a Hausdorff space is both proper and closed. Every surjective proper map is a compact covering map. A map. f : X → Y {\displaystyle f:X\to Y} is called a compact covering if for every compact subset. K ⊆ Y {\displaystyle K\subseteq Y} there exists some compact subset.
Comparison of free off-line satellite navigation software. This article contains a list with gratis (but not necessarily open source) satellite navigation (or "GPS") software for a range of devices (PC, laptop, tablet PC, mobile phone, handheld PC (Pocket PC, Palm)). Some of the free software mentioned here does not have detailed maps (or maps ...
In July 2010, MapQuest announced plans to become the first major mapping site to embrace open-source mapping data, launching a new site separate from its main site, entirely using data from the OpenStreetMap project. On July 14, 2010, MapQuest launched a simplified user interface and made the site more compact.