Much faster map tiles processing #5
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Modified version of extract_features.py to allow faster processing and much larger areas using multiprocessing and generators. Also includes implementation for z_ordering and optional .png map tiles rendering on /test_imgs.
Added process_features_new and style_features_new, also modified clip_lines and clip_polygons using generatores for memory efficiency.
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Faster processing of much larger areas with multiprocessing and generators