[OSM-dev] A PostgreSQL extension for real-time simplification of objects in OSM API database
rtosmdb at gmail.com
Fri Nov 18 03:22:03 UTC 2016
The simplified result of many objects are topologically consistent,
which means any two objects share a node in original datasets will
share the same node in their simplified version. However, the topology
preservation is a complicated issue for data simplification, more
tests are needed.
On Thu, Nov 17, 2016 at 9:42 PM, Jukka Rahkonen
<jukka.rahkonen at latuviitta.fi> wrote:
> Martin Koppenhoefer wrote 2016-11-17 14:39:
>> 2016-11-17 11:08 GMT+01:00 Rory McCann <rory at technomancy.org>:
>>> But... isn't there a danger that the mapper will load this
>>> simplified/reduced object in JOSM (etc), change the tags, then press
>>> upload? And then upload the simplified/reduced geometry? Which will
>>> the OSM data worse?
>> there would have to be precautions, the editors supporting reduced
>> data download would have to take care that only unreduced data can be
>> edited and uploaded. Maybe the API-server restituting different ids
>> for reduced data could help here as well, so even if the data consumer
>> / editor doesn't implement a special rule and someone tried to upload
>> simplefied data it would not overwrite the un-simplified OSM elements
>> or could be rejected.
> There can be a need to make the features which are edited to match with
> other existing features. If those other features are reduced ones the result
> may not be what was expected. It may be hard to make this system reliable.
> -Jukka Rahkonen-
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> dev at openstreetmap.org
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