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You could use OpenStreetMap coastlines. The data is provided by Jochen Topf from here as a shapefile free of charge: http://openstreetmapdata.com/data/coastlines. Plaese considere ther the ODbL license when working with OpenStreetMap data.


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Download QGIS, download the dataset and unzip it. Drag and drop the .tiff (geotiff raster files) and .shp (shapefile vector files) into the opened QGIS window. All the data uses the standard projection 4326 so no headaches mixing any of the datasets


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Natural Earth project has these datasets and many more: http://www.naturalearthdata.com/features/


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The word localization is a new and, in my opinion, an annoying addition to geomatics. The question used to be: What is the difference between positioning and location? Two possible answers to which were: they're the same thing the difference depends on a specific context One context was AVL (automatic vehicle location). In the late '80s, Hassan Karimi ...


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I think your problem is a special kind of collision detection. You can try to solve it using your own algorithm but it will be very complicated and unreliable specially when your polygons have complex shapes such as wholes. The fastest and easiest way I know for this kind of problems is using the graphic capabilities built into most programming languages ...



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