Since I am rendering test-seeds for 1.7.2, I needed to see the overall map in 2D, but had to realize that our 2D map renderer gave up on the current map format. The software has not been update since 2012 or earlier, so I went and looked for a new one that works.
I eventually found one, however that one renders in tiles and is not able to restrict the output to a certain coordinate. So what I had to do is write a code that would assemble the tiles into one image and then cut off the borders so that it stops where our lot stops.
This is now basically finished, and I now have to make the process fit for all our different sized maps and automate the new process. The advantage is that the new map is considerably better looking than the old one and that there are no more black spots for newer blocks anymore.