Cartagen Wiki
Geo Hashes
Geohashes can be thought of as rectangular subdivisions of the Earth’s surface. Learn more here: Geohash at Wikipedia. They were invented by Gustavo Niemeyer in 2008.
A degree of latitude is ~111.3km anywhere on earth. A degree of longitude varies depending on your latitude, but at the equator, it is also ~111.3km.
Dimensions in lon,lat of geohashes of length n:
| N | Longitude | Latitude | east/west distance at equator | north/south distance at equator |
|---|---|---|---|---|
| 12: | 0.00000033527612686157227 | 0.00000016763806343078613 | ~3.7cm | ~1.8cm |
| 11: | 0.000001341104507446289 | 0.000001341104507446289 | ~14.9cm | ~14.9cm |
| 10: | 0.000010728836059570312 | 0.000005364418029785156 | ~1.19m | ~0.60m |
| 9: | 0.00004291534423828125 | 0.00004291534423828125 | ~4.78m | ~4.78m |
| 8: | 0.00034332275390625 | 0.000171661376953125 | ~38.2m | ~19.1m |
| 7: | 0.001373291015625 | 0.001373291015625 | ~152.8m | ~152.8m |
| 6: | 0.010986328125 | 0.0054931640625 | ~1.2km | ~0.61km |
| 5: | 0.0439453125 | 0.0439453125 | ~4.9km | ~4.9km |
| 4: | 0.3515625 | 0.17578125 | ~39km | ~19.6km |
| 3: | 1.40625 | 1.40625 | ~157km | ~157km |
| 2: | 11.25 | 5.625 | ~1252km | ~626km |
| 1: | 45 | 45 | ~5018km | ~5018km |
IGNORE THE FOLLOWING NUMBERS
They’re wrong - i used x,y instead of lat/lon, and as a result they’re only valid for Rome; projected values are location-specific. But they’re interesting anyways and I wasted a half-hour on them so I’m saving them.
| N | x | y |
|---|---|---|
| 12: | 0.03352761268615723 | 0.022274659015238285 |
| 11: | 0.1341104507446289 | 0.1781972600147128 |
| 10: | 1.0728836059570312 | 0.7127890586853027 |
| 9: | 4.291534423828125 | 5.702313330955803 |
| 8: | 34.332275390625 | 22.809258637949824 |
| 7: | 137.3291015625 | 182.4745806204155 |
| 6: | 1098.6328125 | 729.8819535905495 |
| 5: | 4394.53125 | 5838.531777993776 |
| 4: | 35156.25 | 23348.537284125574 |
| 3: | 140625 | 187680.11060012504 |
| 2: | 1125000 | 744941.5192134883 |
| 1: | 4500000 | 6966582.671835422 |