[OSM-dev] Chopped of ways. Change Default or remove ID

[Nick Austin]

On Thu, Aug 14, 2008 at 9:31 AM, Jochen Topf <jochen at remote.org> wrote:
> On Thu, Aug 14, 2008 at 09:46:45AM +0200, Marcus Wolschon wrote:
>>
>> I propose to not modify ways by default and to remove the way-id of
>> ways that are modified during extraction.
>> What should a tool care if the way references node-ids that it has
>> no nodes for because they are outside the bounding-box? It has to ignore
>> them.
>>
>> The removal of the ID is because this is no longer the way with
>> that ID but a new and artificially created way that contains a part
>> of the original one.
>
> If you remove the ID the way can't be referenced any more from
> relations which you might also have in the OSM file. But I agree that
> the way is somehow different, not the same anymore so it might not have
> "a right" to this ID.
>
> In a more general case, if you remove some tag from a node and leave of
> the ID because of that, you can't reference it any more from ways, which
> might make the node useless. There are good reasons for removing, say
> all "created_by" tags, because they take a huge amount of space and most
> people will not need them.

Then just flip the sign of the ID to make it a negative number, (unless negative
IDs already have some meaning of which I'm not aware).

NIck.