https://github.com/osmcode/mercator-projection
Different implementations of Mercator projection
https://github.com/osmcode/mercator-projection
Last synced: 10 months ago
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Different implementations of Mercator projection
- Host: GitHub
- URL: https://github.com/osmcode/mercator-projection
- Owner: osmcode
- Created: 2016-12-19T10:17:57.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2017-01-12T14:31:42.000Z (about 9 years ago)
- Last Synced: 2025-04-17T14:39:13.148Z (10 months ago)
- Language: C++
- Size: 30.3 KB
- Stars: 5
- Watchers: 4
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# mercator-projection
Experiments to find the best mercator projection function for use by
[libosmium](http://osmcode.org/libosmium).
## `compare_results`
Compare results of different algorithms.
## `benchmark`
Run benchmark comparing different implementations. Note that these benchmarks
use uniformly distributed random numbers which don't represent actual numbers
in OSM well.
## `lat_stat`
Run statistics on the distribution of latitude values in OSM. This is the
result from 2016-12-21:
| degree | count | percent |
| -----: | ----: | ------: |
| 0 | 12008881 | 0.33% |
| 1 | 17762590 | 0.49% |
| 2 | 9064484 | 0.25% |
| 3 | 14286757 | 0.39% |
| 4 | 17684240 | 0.48% |
| 5 | 16943942 | 0.46% |
| 6 | 22740428 | 0.62% |
| 7 | 24304089 | 0.67% |
| 8 | 20050603 | 0.55% |
| 9 | 17727349 | 0.49% |
| 10 | 18704372 | 0.51% |
| 11 | 18084987 | 0.49% |
| 12 | 19083560 | 0.52% |
| 13 | 17892790 | 0.49% |
| 14 | 23464741 | 0.64% |
| 15 | 15365604 | 0.42% |
| 16 | 17829984 | 0.49% |
| 17 | 20095527 | 0.55% |
| 18 | 25793449 | 0.71% |
| 19 | 19541694 | 0.53% |
| 20 | 17382722 | 0.48% |
| 21 | 14017581 | 0.38% |
| 22 | 19047975 | 0.52% |
| 23 | 18238732 | 0.50% |
| 24 | 13666258 | 0.37% |
| 25 | 14787576 | 0.40% |
| 26 | 18840869 | 0.52% |
| 27 | 27827341 | 0.76% |
| 28 | 26152310 | 0.72% |
| 29 | 35748941 | 0.98% |
| 30 | 36429620 | 1.00% |
| 31 | 28542067 | 0.78% |
| 32 | 37653401 | 1.03% |
| 33 | 65088262 | 1.78% |
| 34 | 79722859 | 2.18% |
| 35 | 84125327 | 2.30% |
| 36 | 73319083 | 2.01% |
| 37 | 75865865 | 2.08% |
| 38 | 70869723 | 1.94% |
| 39 | 74718802 | 2.04% |
| 40 | 87981378 | 2.41% |
| 41 | 91058820 | 2.49% |
| 42 | 98554193 | 2.70% |
| 43 | 126460316 | 3.46% |
| 44 | 120349195 | 3.29% |
| 45 | 158285354 | 4.33% |
| 46 | 143499424 | 3.93% |
| 47 | 164812088 | 4.51% |
| 48 | 195168653 | 5.34% |
| 49 | 174650223 | 4.78% |
| 50 | 184564170 | 5.05% |
| 51 | 187561628 | 5.13% |
| 52 | 151327838 | 4.14% |
| 53 | 107258963 | 2.93% |
| 54 | 68001779 | 1.86% |
| 55 | 68246437 | 1.87% |
| 56 | 48965777 | 1.34% |
| 57 | 30921736 | 0.85% |
| 58 | 31927914 | 0.87% |
| 59 | 37734211 | 1.03% |
| 60 | 39452857 | 1.08% |
| 61 | 32986848 | 0.90% |
| 62 | 23017847 | 0.63% |
| 63 | 20143691 | 0.55% |
| 64 | 13580210 | 0.37% |
| 65 | 7352543 | 0.20% |
| 66 | 8681265 | 0.24% |
| 67 | 6089092 | 0.17% |
| 68 | 7778302 | 0.21% |
| 69 | 7343956 | 0.20% |
| 70 | 3073368 | 0.08% |
| 71 | 1331738 | 0.04% |
| 72 | 747441 | 0.02% |
| 73 | 597278 | 0.02% |
| 74 | 433194 | 0.01% |
| 75 | 501785 | 0.01% |
| 76 | 404051 | 0.01% |
| 77 | 373793 | 0.01% |
| 78 | 337416 | 0.01% |
| 79 | 307339 | 0.01% |
| 80 | 462390 | 0.01% |
| 81 | 255295 | 0.01% |
| 82 | 1027907 | 0.03% |
| 83 | 143650 | 0.00% |
| 84 | 108233 | 0.00% |
| 85 | 94760 | 0.00% |
| 86 | 49008 | 0.00% |
| 87 | 1149 | 0.00% |
| 88 | 0 | 0.00% |
| 89 | 3300 | 0.00% |
| 90 | 41 | 0.00% |
| total | 3654485229 | 100% |