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I managed to complete this task by converting the polygons in lines and then I use the SAGA GIS and the tool split Lines with Lines.


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Looking at that image, my question would be - are you sure it's the islands? It could be the coastline. Fixes: Islands - if you think it's the islands, then just exclude them. I'd suggest simply calculating the areas of the features and removing any that are island sized. There appears to be a clear size difference in your features so you won't end up ...


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If you really need your layer physically (e.g., saved on your disk), you should follow @Tangnar's advice, but if you want to play with the layer (basically what they are for), there is no such need (since you are testing layer behaviour by a script). Professionally I do not use (never, ever) MakeFeatureLayer_management to create layer in Python scripts but ...


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There is Aggregate Polygons (Cartography) tool in ArcGIS. Looks like it is what are you looking for:


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A few suggestions. Make one large polygon the overlays everything and the use the Erase function (info license only) to get the gaps as polygons. Now break up this polygon into a fishnet and use spatial joins. Now Dissolve on the value that gives you the colors above. Use Spatial Allocation to fill the empty space. Polygonize it, do not simplify. Now ...



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