I'm currently creating a 2048x1024 image of the earth using the Natural Earth
data set. I need to be able to look at every pixel from my map and determine
whether or not it is inside a country or group of countries. The best way I've
implemented this so far is by creating a bounding box around the country (or
group of countries) and then iterating through each pixel inside that bounding
box (to prevent iterating over the entire world map). I convert the pixels to
coordinates then call the contains() method to determine if the coordinate is
within the polygon for the country. This method works, but is very slow for
some areas, especially if the bounding box gets large, which happens if you
select many countries or with area's that span the entire globe. There are
several groupings that span half or most of the world. If I select larger
groups or even select all countries the checks take an extremely long time to
complete.
Is there a suggested better (more efficient) way to do this kind of task with
your tools I may have overlooked? I'm still learning the tools here and would
very much appreciate any feedback or assistance you could give.
Additionally the bounding box for a country like Fiji from the Natural Earth
data spans the entire globe (-180 to 180 degrees). Is there an approved method
of splitting the bounding boxes in that case to reduce the area I have to check?
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