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2. Karnaugh map - Wikipedia

   en.wikipedia.org/wiki/Karnaugh_map

   This image actually shows two Karnaugh maps: for the function ƒ, using minterms (colored rectangles) and for its complement, using maxterms (gray rectangles). In the image, E() signifies a sum of minterms, denoted in the article as . The Karnaugh map (KM or K-map) is a method of simplifying Boolean algebra expressions.

3. Perfect map - Wikipedia

   en.wikipedia.org/wiki/Perfect_map

   A perfect map need not be open (see previous example), but these properties are still preserved under perfect maps. Every homeomorphism is a perfect map. This follows from the fact that a bijective open map is closed and that since a homeomorphism is injective, the inverse of each element of the range must be finite in the domain (in fact, the ...

4. OpenStreetMap - Wikipedia

   en.wikipedia.org/wiki/OpenStreetMap

   OpenStreetMap (abbreviated 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 photo imagery or satellite imagery, and also import from other freely licensed geodata sources.

5. Compass rose - Wikipedia

   en.wikipedia.org/wiki/Compass_rose

   Linguistic anthropological studies have shown that most human communities have four points of cardinal direction.The names given to these directions are usually derived from either locally-specific geographic features (e.g. "towards the hills", "towards the sea") or from celestial bodies (especially the sun) or from atmospheric features (winds, temperature). [1]

6. Thematic map - Wikipedia

   en.wikipedia.org/wiki/Thematic_map

   The most common purpose of a thematic map is to portray the geographic distribution of one or more phenomena. Sometimes this distribution is already familiar to the cartographer, who wants to communicate it to an audience, while at other times the map is created to discover previously unknown patterns (as a form of Geovisualization). [17]

7. Comparison of web map services - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_web_map_services

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