I'm currently trying to perform an analysis on a number of points and their EEZ regions in QGIS (see my earlier question here).
Here's an impression of what I've done so far:
In dark red, I've created a dissolved feature of a collection of line buffers around the EEZ regions. In grey, I've dissolved the relevant EEZ regions themselves.
I'd like to compare the areas of both. This is where it's getting strange. When I inspect the area of the buffered borders, it's about 960.412 square kilometers, see:
But when I inspect the area of the EEZs as a whole, it amounts to merely 66.739 square kilometers!
Clearly, the area of the EEZs as a whole should be larger than the area of the buffered EEZ borders (by a few orders of magnitude).
Questions: what's going wrong? And how can I obtain the correct areas of the buffered borders and the EEZ regions as a whole, respectively?