[Thuban-devel] scaling

[Russell Nelson]

Bernhard Herzog writes:
 > If multiple layers want to adjust the scale the ones later in the list
 > only see the already adjusted scale.  Is that really the right approach?

Probably not.  I think that the basic design of Thuban is correct in
that every layer should expect to have to deal with a scale of
arbitrary value.  It's just that Terraserver has an intrinsic scale of
1, 2, 4, 8, .... meters per pixel, and it only makes sense to work
with them if possible.  If not possible, then rescaling is necessary.

 > I would have expected that all layers would base their adjustments on
 > the same initial scale.  If only one layer returns a different one or if
 > all layers that return a different one return the same one, that one
 > would be taken.  How to proceed if the layers that want a different
 > scale don't agree, I don't know.

Me neither.  I'll go ahead and implement something and we'll see how
it works!

 > On the whole, I think this scale adjustment needs more thought before it
 > goes into CVS.

Yup, agreed.  I'll run with it in my implemementation and see how it
goes.

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