Changeset: 52834243
#hotosm-project-3671 #HurricaneMaria #PuertoRico
Closed by Verdy_p
Tags
changesets_count | 7134 |
---|---|
created_by | iD 2.4.3 |
hashtags | #hotosm-project-3671;#HurricaneMaria;#PuertoRico |
host | http://www.openstreetmap.org/edit |
imagery_used | Custom (https://{switch:services,server}.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x});Local GPX |
locale | fr-FR |
Discussion
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Comment from Nehaj
Hi Verdy_p,
do you really think, that there is a 500 kV power line in Puerto Rico?
Greetings
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Comment from Verdy_p
I've not indicated any voltage, I just traced the visible lines or prolongated those that were only started.
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Comment from Verdy_p
look at the history to find who indicated the voltage initially. I can't tell that!
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Comment from Verdy_p
Notably look at https://www.openstreetmap.org/changeset/52718816
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Comment from Verdy_p
This was done before me!
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Comment from nickvet419
I did the same, but anyone can go back and adjust the default values.
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Comment from Verdy_p
So you say you indicated "default values". In OSM there's NO default value at all to insert in the database, if you don't know, don't specify anything. Anytway I have not removed anything in existing tags, even if it's possible that I interconnected two segments of a line and joined them as there was by evidence no break at all: if this happens the merged way will have the tag coming for any one of the initial segment.. I did not merge any pairs of segments when there was a doubt with other incoming lines with intersections (we have some indicators of these intersections: angles, very irregular distance between poles, even if sometimes some angles are necessary to pass over some narrow valley with longer arcs, or get into a deep valley by creating short arcs near the summit to dive into the valley, or near the bottom of the valley, or when the line follows a valley to follow its curconvolitions by zig-zaging with alternances of short arcs in the curves and long arcs passing from one side of a river to the other side. Within dense urban sectors, electric lines tend to follow the streets (due ti higher buildings), in less dense residential areas they pass easily over houses and gardens, but generally they pass near the border of forests (or along rural tracks without tall trees), and tend to limit the changes of elevation. small hills are passed with longer arcs mounted on higher poles and pass over all tress, houses, rivers, roads, railways (however these long arcs are more exposed to wind, notably during hurricanes, the huge forces can break them as the arcs will be moving/extending/ relaxing repeatedly and there will be resonance of waves creating break opportunity at more positions of the wind wave length: huirricanes create shorter wave lengths than classic tempests or local storms, resonance of these waves are a severe difficulty and the only to stop these waves is to add more poles to absorbe them, and it is more difficult to do in dense residential areas, and why electric lines tend there to follow streets/roads even if winds near the ground may be amplified (but with more constant direction, less pulses, and less resonance effects: what is needed is just a way to keep the pole firmly in place to resist the traction forces, and make sure they are deedply grounded and resist water flows on the surface)
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