[Talk-ca] Fredericton WMS Offset

nicholas ingalls nicholas.ingalls at gmail.com
Thu Jan 3 19:24:18 GMT 2013

Yeah I did a bit more research afterwards to double check, including going
and getting gps more gps traces and the current (Bing) imagery appears to
be dead on. I also checked it with some centre lines from another data
source (Not importing just to check the imagery) and they also verified
that the Bing imagery is correct.

Thanks for the feedback! I hadn't thought about the atmospheric


On Wed, Jan 2, 2013 at 3:59 PM, Andrew Buck <andrew.r.buck at gmail.com> wrote:

> Hi,
> I am not from the area, but I did want to post my 2 cents about this
> issue.  Your idea of how the offset got started sounds correct.  I
> would caution you though that GPS traces can be offset, too, due to
> atmospheric effects.  To really get a good trace with no offset you
> need to do a few traces on different days of the same road (or path is
> better since it is narrow) and through an area with few buildings
> around as these can cause offsets, too.
> Other than those issues, if you trust your traces then I see no reason
> not to fix the offset, but as I said make sure your traces are good
> first.
> -AndrewBuck
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