I have filed this bug:
http://code.google.com/p/gmaps-api-issues/issues/detail?id=4070

Basically it seems that Google is using a lat/lngs based on an overhead
view to determine lat/lng on a tilted view. This is wrong.

Paul G.



On Sun, Apr 8, 2012 at 7:34 AM, Nianwei Liu <nian...@gmail.com> wrote:

> Elevation could play a role here. There may or may not be a bug in the
> current API, but without handling z value, 45 images will likely have
> distortion of the location, that's just the nature of the problem
> until the API start to request elevation values for the marker and
> process it accordingly.
>
>
> On Apr 7, 2:21 pm, Fraggle <idi...@gmail.com> wrote:
> > See my question at:
> http://stackoverflow.com/questions/10056424/marker-shifts-position-re...<
> http://stackoverflow.com/questions/10056424/marker-shifts-position-re...>
> >
> > Google Javascript Maps API 3.5
> >
> > Basic issue is that if you have a marker that is over a fixed landmark
> like
> > a fire hydrant in the overhead view, then you switch to 45 degree view,
> the
> > marker no longer shows on top of the hydrant. And vice versa (position
> the
> > marker in 45 degree view then switch to overhead).
> >
> > To reproduce:
> >
> > -Create a basic Google Maps web page with a draggable marker. With
> initial
> > marker/map position over an area with 45 degree imagery available: (try:
> > 33.501472920248354, -82.01948559679795). I'm not certain it shows this
> > problem for all areas so try that point to start.
> >
> > -Make sure you are zoomed in near the max and in Satellite view
> >
> > -Turn off 45 degree imagery
> >
> > -Position marker over fixed point (corner of sidewalk, house chimney,
> etc)
> >
> > -change to 45 degree view.
> >
> > -Note that marker position is shifted
> >
> > -Try rotating the 45 degree and see how marker shifts relative to
> original
> > point on image.
> >
> > -Switch back to overhead and marker is in original spot.
> >
> > *Why its a problem*: Don't know what to trust. What view shows the
> accurate
> > position for that marker? Can't create web pages that allow people to
> > position markers in one view and see them in another. Major
> inconsistencies.
>
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-- 
Regards,
Paul Goldstein
SkyDroid - Golf GPS
p...@skydroid.net

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