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EuroBirdPortal – Live bird movements across Europe

eurobirdportal.org

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Re: EuroBirdPortal – Live bird movements across Europe

#19
It's odd that you can see the borders between Belgium and France for various birds (like the swift and cuckoo), same for the border between Germany and Poland.

I wonder why that is? There are no topological features defining these borders. Maybe the data is normalised in some way across countries?

Re: EuroBirdPortal – Live bird movements across Europe

#20
post #19

It's odd that you can see the borders between Belgium and France for various birds (like the swift and cuckoo), same for the border between Germany and Poland. I wonder why that is? There are no topological features defining these borders. Maybe the data is normalised in some way across countries?

If this is based on bird spotters, I'd say the national bird spotting organizations don't report or watch for the same birds.
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