[Tagging] Power generation refinement: power plant model evolution

François Lacombe francois.lacombe at telecom-bretagne.eu
Sat Apr 6 00:25:25 UTC 2013


Today I've updated the proposal to setup an improvement about power plants
global model.

Thanks to Vinking81 suggestions concerning solar power, we found some room
for modifications.

According to that chart:
source and output power of whole power plants are now specified by tags
plant:source and plant:output.
It helps to check consistency with tags generator:source and
generator:output which are member of the power=plant + type=site relation.
Those power plant values are mainly lists of values separated by ; as it's
widely done in OSM.

Secondly, it introduce distinguishing of intermediate and output generators.
Why such a complex thing?
1 - In some cases (like solar farms, geothermal power plants, combustion
power plans) we'll need to output more than only one kind of power.
plant:output=* would be a list of different powers in use outside the plant.
2 - To link generators to each other as for mapping several power
conversion steps through several kind of generators.
Output generators must be distinguished from intermediate generators since
they give the total amount of output power. Intermediate generators don't
produce power which can be used outside the power plant at all.
No new tag to make that distinguishing: only output generators have member
role=generator in power=plant relation.

Output values was added to the generators types table and special roles
table had been reorganized by plant values instead of generators values.
Only generator method remains in that table. Any idea to replace it by a
plant:* tag?

I'm aware it's not the smartest way to make those specifications but it
works well (and it's backward compatible with current model).
If you have any suggestion about that, don't hesitate to answer that mail.

For the two main power plants configuration (conventional and farm), simple
tagging models are still available and don't care of those considerations.
Mappers who are confident in advanced tagging models will be able to
improve accuracy of information in OSM.


*François Lacombe*

francois dot lacombe At telecom-bretagne dot eu
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