[OSRM-talk] Geometry Polyline Coordinates multiplied by 10
patrick.niklaus at student.kit.edu
Mon Oct 5 08:45:30 UTC 2015
> Is it safe for me to simply divide the decoded coordinates by 10?
Yes it is safe to do that. Polyline encodes arbitrary integers.
Multiplication by a factor and rounding is the first step. Dividing by
the factor is the last step.
Sadly the python implementation hard-codes this factor. Might be up
for a rewrite?
On Mon, Oct 5, 2015 at 2:24 AM, Daniel Patterson <daniel at mapbox.com> wrote:
> Hey Bryan,
> The simplest thing to might be to just add "compression=false" to your /viaroute request. That'll give you back a plain JSON array of coordinates, rather than in encoded form.
>> On Oct 4, 2015, at 4:57 PM, Bryan Coutts <bryan.coutts1994 at gmail.com> wrote:
>> I'm trying to use OSRM to supply routes as polylines. I've noticed that, when I use a standard decoder to decode these polylines (i.e. Python's polyline package), the lat/lon coordinates I get are multiplied by a factor of 10. Googling around, I found that this is due to OSRM producing coordinates at a higher precision; is there a way for me to decode these without writing my own decoder, or digging into an existing one? Is it safe for me to simply divide the decoded coordinates by 10?
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