Reporter: bubaya
[Submitted to the original trac issue database at 6.55pm, Friday, 9th November 2012]

Given the following example: [http://parent.tile.openstreetmap.org/cgi-bin/export?bbox=5.0,50.0,5.1,50.016666&scale=10500&format=pdf]

This map extract is 1' lat high, this is 1852m. The scale is 1:10500. Hence, the exported pdf should be 17,64cm high. In fact, it is 34,6cm high; that means a scale of 1:5353.

The same problem if I export images: When I export the same area as a PNG image, the image is 981px high, and has a resolution of 72ppi. That means a height of 34,6cm, the same as the PDF. To match the 1:10500 scale, the image would have to have a resolution of 141.3ppi. If I play around, I do not get a constant resolution that would match the scale, but always value between 140 and 145ppi.