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<DIV>Please remember that this is OpenStreetMap and most mappers are not experts
on the features they are mapping. It is my personal appeal to all to allow a
tagging system that allows general mappers to put a specific feature on the map
using overall basic tags and then the experts can come in and “add” additional
tags to break it into it’s specific grouping or usage and even take it to the
<FONT size=5>n</FONT><FONT size=2>th </FONT><FONT size=3>degree of ridiculous if
they so wish. Let us take the Electricity Grid as that example, if the general
mapper can identify a power line on the aerial imagery then they map it as a
<EM>power=line</EM>. They may even have the ability to identify the position of
most pylons (if the imagery shows a good shadow to identify between pole and
pylon) through open country, it becomes a lot more difficult and blurred in
Towns and Cities. For those who have a bit more local knowledge of the grid they
may then add the major detail such as National Grid which carries the highest
voltage, this breaks down to a lower voltage at a sub station to enter the
regional grid and then repeats this step to a lower voltage again for the local
or distributer grid. </FONT></DIV>
<DIV>Hopefully you will bear in mind the mapper and the process of getting
detail on the map before you start deciding that the mappers should all be using
the detailed knowledge tags that you are proposing. If the tags get too detailed
for general mappers then you are going to stop them from adding basic detail to
the map. I for one will stop adding power lines altogether if I do not know if
it is high or low voltage, national or local grid. I WILL CONTINUE TO MAP THEM
IF I AM ABLE TO JUST TAG IT AS A POWER LINE and be able to leave it up to
someone with more knowledge to identify it further.</DIV>
<DIV>Please remember the majority of mappers are not experts in all fields. I
may identify a structure on the aerial imagery and identify it as a building but
I have no way of knowing if it is a family home, a corner shop or a local pub
... so I tag it with the most general tag <EM>building=yes</EM>. I need to be
able to do the same with power lines ... a very basic tag for general use.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=penegal@live.fr
href="mailto:penegal@live.fr">David Marchal</A> </DIV>
<DIV><B>Sent:</B> Wednesday, October 14, 2015 8:19 AM</DIV>
<DIV><B>To:</B> <A title=tagging@openstreetmap.org
href="mailto:tagging@openstreetmap.org">Tag discussion, strategy and related
tools</A> </DIV>
<DIV><B>Subject:</B> Re: [Tagging] power=* tag: minor_line vs.
line</DIV></DIV></DIV>
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<DIV dir=ltr>Well, I would say: mainly on poles = minor_line, and mainly on
towers = line; this way, the difference is easy to see for mappers, even on Bing
imagery, and, as poles, AFAIK, are always smaller that towers, that would
properly model the landscape impact these power lines have. Besides, I know
we're not supposed to map for the renderer, but the OSM Mapnik stylesheet seems
adapted for such modelling, as minor_line are rendered only on higher zooms,
i.e. starting from z16, which seems to me a correct rendering for lines on
poles, far less visible than lines on towers. I mean, the stylesheet guys made a
logical choice, why not adopting the same? Date: Tue, 13 Oct 2015 22:48:58 +0200
From: fl.infosreseaux@gmail.com To: tagging@openstreetmap.org Subject: Re:
[Tagging] power=* tag: minor_line vs. line (Sent from a phone) Hi David, Many
opinion exists regarding the minor or not line qualification and still no
consensus. As consumers may not be able to make the right distinction between
minor or major lines, I assume using power=line only, in continental France and
always in combination with voltage=* and operator=*. Thus both users and mappers
only have information instead of hypothesis and can make the distinction they
want from the voltage, location and operating company. Additionally, underground
power paths use to be mapped with power=cable + location=underground Let us know
if you have better idea to improve power line mapping ;) All the best François
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