I have points on a map of the globe given with lat|long coordinates. I want to create a rectangular buffer around each one, but I want to be able to set the dimension of this buffer in metres. The boxes will have dimensions of around 100m x 200m so I need my solution to be pretty accurate. The tools I've found so far assume (fairly) that the parameters I pass to it (width, height) are of the same type as the point coordinates. Instead I want to pass parameters in metres whereas my point coordinates are lat long values.
Converting metres to degrees somehow is an option but I'm worried about accuracy.