Hi,

Im having a problem aligning a ground overlay image to my map.

Here's my url:

http://mexsurf.com/test/maptst.html

as you can see, the overlaid png image is not aligning correctly with the
map.

However, opening the direct link to the image, "overlay png image,"  in a
new window or tab, you'll be able to compare & see how the image, in
reality, does correctly line up with the google/Mercator map projection.

It seems that the ground overlaying method is 'compressing' and distorting
my image when it overlays it on the map.

Im guessing this problem might be related to the way the ground overlay
bounds are set?

In my javascript, you'll see that Im passing map.getBounds() to the ground
overlay constructor (in theory, this should be correct?).

Can someone please help me figure out why the ground overlaying method is
distorting my image and therefore not aligning it correctly to the map?

Please help,

Thanks,

P.Romero

GGroundOverlay actually thinks its getting a "flat" projected image
and tries to project it into Mercator with some very clever
JavaScript. Since you seem to have an already correctly projected
image, GGroundOverlay causes your map to get stretched into a
misalignment. This isn't a problem but a feature.

Your problem is especially evident because you're using a low zoom
level and a full earth image. GGroundOverlay is a lot less sensitive
when looking at a zoom 15 image as the stretching is almost
imperceptible.

The solution is to use an overlay method that doesn't alter the image
but instead simply lays it correctly over the map. I wrote such a
library and called it "ProjectedOverlay" - it can be found here:
http://www.usnaviguide.com/js/ProjectedOverlay.js

If you want to use this library, please download it and call it from
your own server.

-John Coryat

http://maps.huge.info

http://www.usnaviguide.com

Thanks,
I'll try your library out.
Right now, Im going to test trying to create my own overlay layer, by
implementing the GOverlay interface, which seems like a more adequate,
sophisticated solution. Im guessing your library does something similar?

Thanks again,
P.Romero

Yes, that's the same approach I used. Feel free to start with my code
if you want.

-John Coryat

http://maps.huge.info

http://www.usnaviguide.com