[OSM-dev] Lite OSM backend

Wollschaf mith at uni.de
Thu Sep 7 23:15:45 BST 2006


Guessing is good, counting is better. 

Analysis of planet-060827.osm reveals: 1.29% (174208) of the nodes are at
latitudes are above 58°; Each of these nodes can be saved with 1 bit
precision less, resulting in 21 KiB saved space. 

At least it was fun to generate the graphs. :)

Graph: http://wiki.openstreetmap.org/index.php/Image:Nodes_by_lat.png

13471435 nodes 
0.00% (86) at lat -41 
0.00% (409) at lat -39 
0.00% (316) at lat -38 
0.00% (284) at lat -37 
0.01% (980) at lat -36 
0.02% (3284) at lat -35 
0.04% (6042) at lat -34 
0.11% (14583) at lat -33 
0.00% (16) at lat -30 
0.00% (129) at lat -28 
0.12% (16119) at lat -27 
0.01% (1348) at lat -26 
0.00% (499) at lat -23 
0.00% (50) at lat -22 
0.00% (39) at lat -19 
0.00% (16) at lat 8 
0.01% (748) at lat 14 
0.00% (324) at lat 15 
0.00% (230) at lat 16 
0.01% (1088) at lat 17 
0.00% (96) at lat 19 
0.00% (313) at lat 22 
0.12% (16700) at lat 28 
4.52% (609508) at lat 29 
5.33% (717374) at lat 30 
12.44% (1675600) at lat 31 
7.16% (963943) at lat 32 
10.10% (1360518) at lat 33 
3.99% (537820) at lat 34 
0.31% (42331) at lat 35 
0.09% (12549) at lat 36 
4.12% (555194) at lat 37 
10.03% (1351297) at lat 38 
11.98% (1614405) at lat 39 
0.90% (121712) at lat 40 
1.83% (246747) at lat 41 
1.08% (145726) at lat 42 
0.89% (119732) at lat 43 
0.39% (52049) at lat 44 
1.48% (199350) at lat 45 
1.51% (203883) at lat 46 
12.74% (1716026) at lat 47 
1.32% (177254) at lat 48 
0.42% (56500) at lat 49 
0.78% (104678) at lat 50 
1.43% (192329) at lat 51 
1.09% (146259) at lat 52 
0.76% (101820) at lat 53 
0.29% (39121) at lat 54 
0.38% (51774) at lat 55 
0.20% (26406) at lat 56 
0.16% (22046) at lat 57 
0.52% (69561) at lat 58 
0.53% (70913) at lat 59 
0.23% (31299) at lat 60 
0.09% (11592) at lat 61 
0.07% (9027) at lat 62 
0.06% (8370) at lat 63 
0.07% (9759) at lat 64 
0.07% (8993) at lat 65 
0.06% (7750) at lat 66 
0.03% (3472) at lat 67 
0.06% (8606) at lat 68 
0.03% (3845) at lat 69 
0.00% (582) at lat 70





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