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The paths ridden do not line up with the actual roads. I am not sure what the OP is actually trying to tell us about that though.
by KnightHawk3 12y ago
The paths ridden do not line up with the actual roads. I am not sure what the OP is actually trying to tell us about that though.
- Holbein 12y agoThere seems to be a chinese decree that all maps must be skewed so that in the case of being attacked, an attacker can presumably not find its way around the chinese capital. Bike maps are likely created directly from GPS paths, which are unskewed. When you look at Bejing, you can easily see that difference.
- 1stop 12y agoExactly, similar to that thing in the US before they opened up civilian GPS accuracy...
- alexkus 12y agoNot quite, the difference between the two situations is the difference between accuracy and precision. E.g. http://academics.wellesley.edu/Chemistry/Chem105manual/Appendices/AccuracyPrecision.gif http://academics.wellesley.edu/Chemistry/Chem105manual/Appen... The Chinese Street maps are very precise but consitently inaccurate (the skew). The GPS tracks shown are relatively precise and accurate. The change to the GPS signals (by not encrypting as much of the timestamp data) improved precision.