[Gdal-dev] projected bounding box
jonathan at intevation.de
Mon Jul 14 12:51:46 EDT 2003
On Mon, 2003-07-14 at 18:39, Ed McNierney wrote:
> This is a tricky problem to solve in a general case,
> and has been the source of a number of software bugs
> I've met along the way!
Hopefully, in the future, not with Thuban ;)
> To do it right, you need to take EACH POINT along
> each of the edges of the output bounding box (rectangle)
> and reproject it back into the source projection. For
> each edge you calculate the appropriate minimum/maximum
> value in the input projection.
I was afraid of this response.
> it might be easier for you to take your specific application and calculate
> a "buffer" value.
> This is obviously a special-case solution, but it's
> probably a lot simpler and faster than trying to solve
> the general problem.
That's the problem, this isn't a special case situation. It should
really work with any projection anywhere on the globe. It certainly is
something for me to think about though. Perhaps I can come up with a way
that will guarantee a good buffer value. Thanks for your thoughts.
Jonathan Coles jonathan at intevation.de
Intevation GmbH http://www.intevation.de
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