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The best way to get boundaries of countries, provinces and regions is to use the OSM Boundaries application: https://osm.wno-edv-service.de/boundaries/ Extracting boundaries from generic tools like Overpass Turbo is not always easy, as the boundaries may contain errors and are likely complex multipolygons consisting of many parts. The OSM Boundaries ...


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The easiest way to get OpenStreetMap extracts would probably be through Mapzen's Metro Extracts tool here I would suggest exporting it in GeoJSON, then using a tool like ogr2gre (there's an online version here) to convert it to KML. You may also be interested in looking at Overpass Turbo for exporting data from OpenStreetMap.


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Instead of creating a convex hull over a set of points with the same attributes, create a Voronoi tesselation of all points, then merge the Voronoi polygons of those points with the same attributes. There are lots of ways to process the information you may have, and what I just said is one idea on how to do it. Voronoi + merge might create multipolygons, ...


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Download administrative boundaries of the spain and portugal from in .shp format from http://www.gadm.org/ you can import the shapefiles into QGIS or another software the filter with query builder to isolate the regions you are interested in QGIS you can install openlayer plugin from the vectors tab select- openstreetmap then select download data points, ...


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You could download data directly from Openstreetmap as .osm file, and convert it in QGIS as .kml, since QGIS supports export data as .kml. Alternatively, you could download data from Geofabrik (also openstreeet map data, but country by country, as .gbd/mdb, and in ArcMap, export it as .kml. Also, I would suggest you to use, if you have, shapefiles od Spain ...



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