Hi all,
I'm having trouble getting my head around the image scale
when using the sky maps. Hoping someone can help me out.
I'm trying to figure out the arc seconds per pixel for the current
zoom level, which I would have thought would be the same on the
vertical and horizontal axis, but I seem to be getting different
values. The horizontal value is always the same for a given zoom
level, regardless of map position, but the vertical values changes as
the map position does. This is what I'm doing:
1. get bounds using map.getLatLngBounds()
2. get viewable width by subtracting bounds.getEast() - bounds.getWest
()
3. multiply viewable width in decimal degrees by 3600 to get viewable
width in arcseconds
4. divide viewable width in arcseconds by viewable width in pixels to
get arcseconds per pixel.
5. repeat for height
Could the problem be something to do with the projection of the map?
Another thing I noticed is the scaleControl is useless, apparently the
andromeda galaxy is 1 meter across :) but the interesting this is
that the scale changes as the map is moved vertically. Sounds like
this could be related to my issue maybe?
I'm completely new to this, and figuring it out as I go, so I could be
doing this completely wrong, any help at all would be great.
Thanks
Dave
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