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You don't have one polygon, you have many. It looks like the xy coords from all polygons are just dumped into one large list to make a single polygon. Hence the polygon boundary is jumping around creating bad topology. As the above commenters say, your question is poor. But, taking a guess: if you only want one polygon merge your data together prior to ...


You can create the polygon using Buffer. Note that the distance is in the units of the coordinate reference system you're using (which is probably degrees since you said its latitude and longitude). So if you want a 10 metre buffer, you probably need to project it (or be willing to accept some inaccuracy in the buffer size if you just want to convert 10 ...

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