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PNG is a lossless, truecolor image format. It is good for all maps and particularly for maps with more than 256 colours. As a pixel-based image, it is more difficult than an SVG image to edit. Some uploaders prefer to work with SVG and then upload a PNG version. SVG is vector graphics format, which has three main advantages:
Run the query, then click 'Export' in the toolbar and select the 'copy' part of 'download/copy as GeoJSON' In Wikimedia Commons, create a page in the Data: namespace with the .map extension, like Data:COTA10.map; When you create the page, replace the 'Data' placeholder (including the two brackets) with the GeoJSON you copied.
In order to create an interactive map in an article, you need to have one of the below forms of data: coordinates, either supplied or from Wikidata; a Wikidata ID for a shape or linear element; data stored in GeoJSON format in a data file; raw GeoJSON, preferably transcluded from another page
These SVG maps have user-editable sections (any text editor) to allow creation of more maps on more topics. Just paste in a list of states and values. See examples at Commons:Category:English-language SVG maps of the United States made with templates. Feel free to create map templates for other countries too. Cmglee may be able to help with that.
A tiled web map, slippy map [1] (in OpenStreetMap terminology) or tile map is a map displayed in a web browser by seamlessly joining dozens of individually requested image or vector data files. It is the most popular way to display and navigate maps, replacing other methods such as Web Map Service (WMS) which typically display a single large ...
Therefore a relief location map that combines i.e. this map File:Reliefkarte Italien.png with the borders of this map File:Italy location map 1905.svg (but without the post World War II regional boundaries) and that only includes Northern Italy would be perfect.
Image:Map of USA-bw.png – Black and white outlines for states, for the purposes of easy coloring of states. Image:BlankMap-USA-states.PNG – US states, grey and white style similar to Vardion's world maps. Image:Map of USA with county outlines.png – Grey and white map of USA with county outlines.
Most of these conventions are supported by active groups of map makers, and have been created and improved through long and serious discussions. The main intentions are: to display efficiently selected data; to create screen, web, print, creation & share friendly maps; to create a wiki style free of nationalism issues.