However, it does include all your map's area and can be tailored into a perfect square that DOES fit your map.
Be aware that even though you supply perfect co-ordinates to the Google Maps Downloader, the stitched-together image you end up with is NOT a PERFECT fit for your map. I use Adobe Photoshop for converting the map image but I understand that it can be done in MS Paint just as well. I don't recall exactly what PNG is an acronym for, but I once heard it described as Probably Not a GIF. An interlaced PNG image will work but there's really no need for it to be interlaced and I believe a non-interlaced PNG may be a bit smaller. Once downloaded that image must be rendered into a PNG.
Skye's Building Zurich (which I strongly recommend viewing) uses a precision that yields 512 map segments. The program can be purchased for about $35 for those wanting more precision. The image for an 18 Sq Km section comes in 30 segments which can be stiched together via the Map Combiner tool that is part of the program. The Google Maps Downloader will download images at a zoom of 13 for free which is precise enough for most users.
