[Talk-us] New version of US redaction map

Martijn van Exel m at rtijn.org
Tue Aug 14 03:09:28 BST 2012

On Mon, Aug 13, 2012 at 12:27 PM, Mike N <niceman at att.net> wrote:

> On 8/13/2012 12:48 PM, Martijn van Exel wrote:
>> The main new thing is that it now shows deleted ways as well
>  Very nice - this map and Toby's are very useful.     I see that the
> deleted ways are purple.
>   One thing I have noticed is that it would be nice to detect a new
> roadway having been added under the old deleted roadway, and automatically
> remove the notification.
Interesting idea. My US database is currently catching up with reality, so
I can't really try until that has completed, but I do have an idea how to
make that work. Without relying on human tagging like in the Inspektor.
What I would do is select all (current) ways that overlap the bounding box
of the deleted way and that are created after 7/15, then calculate the
hausdorff distance between the deleted way's geometry and the results of
that query. If we get a close match, it is *very likely* that the way has
already been remapped. Identical highway= tags may further corroborate
this. What I am not so sure about is using the non-compliant geometry and
tags this way, from a legal perspective. Anyone who can offer any ideas on


martijn van exel
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