Jump To isn't zooming close enough

[osjonathan]

Using my EPSG:27700, I've set up a Jump To thus:

"Britain" : [0,0,700000,1300000],

This should zoom to Britain, and in a manner of speaking it does. The problem is that it also includes most of France, Germany, Denmark and the rest of North Western Europe.

If you look at the attached, you'll see what happens when the Jump To is used, as well as what area is covered by those coordinates (the red box). As can be seen, only the northern border is correct. As Britain is taller than it is wide, what should happen is that the north and south bounds hit the edge of the map area (as north has), and there is extra east/west showing beyond the bounds.

Using the Zoom tool to try and draw a bounding box around this area (red square) doesn't seem to get any closer.

[theduckylittle]

There are a couple of quirks to this.

1. When using web mercator, your scales are fixed, and since the application starts in Web Mercator, fixed scales are turned on by default.
2. Differing screen sizes and resolutions will change how the effect works.
3. OpenLayers can either fit the entire extent or will go to the next step to get "closer". We have it set to the former.

I'd suggest trying a different setting in your mapbook:

<param name="fractional_zoom">true</param>

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