source: subversion/applications/rendering/mapnik/zoom-to-scale.txt @ 7504

Last change on this file since 7504 was 6130, checked in by jochen, 12 years ago

Added comparison between zoom levels and the scale denominator numbers needed for the Mapnik Map file.

File size: 911 bytes
Line 
1
2Comparison between zoom levels and the scale denominator numbers needed for
3the Mapnik Map file.
4
5zoom level=1 scale_denom=279541132.014
6zoom level=2 scale_denom=139770566.007
7zoom level=3 scale_denom=69885283.0036
8zoom level=4 scale_denom=34942641.5018
9zoom level=5 scale_denom=17471320.7509
10zoom level=6 scale_denom=8735660.37545
11zoom level=7 scale_denom=4367830.18772
12zoom level=8 scale_denom=2183915.09386
13zoom level=9 scale_denom=1091957.54693
14zoom level=10 scale_denom=545978.773466
15zoom level=11 scale_denom=272989.386733
16zoom level=12 scale_denom=136494.693366
17zoom level=13 scale_denom=68247.3466832
18zoom level=14 scale_denom=34123.6733416
19zoom level=15 scale_denom=17061.8366708
20zoom level=16 scale_denom=8530.9183354
21zoom level=17 scale_denom=4265.4591677
22zoom level=18 scale_denom=2132.72958385
23
24scale_denominator = map_width_in_metres/ (map_width_in_pixels *
25standardized_pixel_size/*0.28mm*/)
26
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