[Merkaartor] How to remove way_4539895?

[Chris Browet]

To be complete, the "402 - Precondition failed" is sent by the server
because, as Merkaartor didn't know about the relation, it didn't send the
command to remove the way from the relation. The API thereafter detects that
we are trying to remove a way which is still used and denies the request
with a 402.

- Chris -

On Sun, Jan 18, 2009 at 1:47 AM, Chris Browet <cbro at semperpax.com> wrote:

> In the download dialog, you have to enable "Resolve all relations".
>
> Explanation:
> When downloading from the API by bounding box (e.g. viewport), the
> relations which cross the viewport are downloaded but not all of their
> children.
> To avoid inconsistencies, at the end of the download, all relations of
> which not all children have been downloaded are removed.
>
> When enabling "Resolve all relations", rather than removing the relation,
> all missing children are downloaded and thus you are sure the relation is
> complete.
> The downside of this (and the reason it is not enabled by default; it is
> remembered, though) is that if the viewport fortuously cross a very large
> relation (like a border or a large cycleway, for instance), every features
> would be downloaded, which would mean a large, slow, unecessary download.
>
> This is hinted at
> http://wiki.openstreetmap.org/wiki/OSM_Protocol_Version_0.5#Retrieving_nodes.2C_ways.2C_and_relations,
> at the end of the paragraph.
>
> - Chris -
>
>
> On Sat, Jan 17, 2009 at 11:21 PM, Yves Goergen <
> nospam.list at unclassified.de> wrote:
>
>> way_4539895 seems to be part of a relation, but Merkaartor doesn't allow
>> removing it. It also doesn't highlight the relation outline when I
>> select the road. But it lists the relation when I click on "Referenced
>> by relation". Adding and then removing the road to/from that relation
>> doesn't make a difference.
>>
>> This way originally was almost directly over the near road of the same
>> type. I managed to detach it at both ends and move it off the road so
>> that it can be better seen and handled. It even shared its nodes with
>> two on the real road. It almost wasn't visible if it didn't shortcut a
>> slight curve...
>>
>> The road segment cannot be removed in Merkaartor, the server always says
>> "Precondition failed". Potlatch doesn't seem to have a remove function.
>> JOSM is too complicated that I could use it.
>>
>> It seems that relations often cause problems in the map. 1) many people
>> just don't notice them and destroy carefully crafted bicycle routes
>> (says someone from my neighbour village who constantly repairs his
>> routes) and 2) they seem to cause "Precondition failed" errors that you
>> don't seem to be able to explain or resolve.
>>
>> --
>> Yves Goergen "LonelyPixel" <nospam.list at unclassified.de>
>> Visit my web laboratory at http://beta.unclassified.de
>>
>> _______________________________________________
>> Merkaartor mailing list
>> Merkaartor at openstreetmap.org
>> http://lists.openstreetmap.org/listinfo/merkaartor
>>
>
>
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