/images/3515684#comment_11074393 shows that old Pony Town map (which other servers use)'s size is 5120x3840 and the current one is 6400x4800. Polyethylene Server's mini-map allows copy image, and under x1 zoom, the image is 160x160. This means each block in Pony Town is 32x24, because 5120÷160=32 and 3840÷160=24. Since we know the current one's map size is 6400x4800, and a block's size is 32x24, we could know the current map has 200x200 blocks, because 6400÷32=200 and 4800÷24=200. This means if we set the Pony Town's mini-map as 200x200 and use the smallest zoom, we can get the original mini-map.

I havn't find the way to delete the pins from the webpage yet, so I deleted them manually. Yet on library, a pixel's color cannot be decided, so I guessed it.

~Minimap without pin, unknown spot on library is red~