###This script takes as input a set of ExactEarth AIS csv files and will:
- cleans the data following some basic criteria and outputs both clean data files and dirty data files
- joins (inner) that data with an international database of ship names / MMSI / IMO / types / etc, to drop off some of wonky data
- converts these cleaned csv's to point shapefiles
- converts the points data to lines shapefiles
- ** not yet implemented ** -- open source version of simple line density to show the 'lanes'.
[ more documentation and features to come ]