Re: [HOT] Mapping high tension power lines in Nepal

Thu, 21 May 2015 21:56:36 -0700

Hello Brad,

        Sorry to be slow on this, lots to keep up with.

        In terms of helicopter flight hazards, it wouldn't really be necessary to map all the power lines, end to end.  The hazards are primarily where the power lines cross valleys or gorges.  Marking only those types of sites may save a lot of time.

        In addition, if the pilot has to scan the whole powerline map to assess for hazards, that is not much help overall.  Our aviation charts do show power lines but also show the crossings with tower symbols.

        Also worth mapping are communication towers.  These can prove quite a threat in poor weather, especially if not lighted or marked.

                 Thanks, Cheers . . . . . . . . Spring Harrison




At 14-05-2015 08:23 Thursday, Brad Neuhauser wrote:
Fyi, user GautamPratik already started entering some hydro sites using the tag hydropower_project:name. Here's a search for that: http://overpass-turbo.eu/s/9lJ

And one for power=generator generally in Nepal: http://overpass-turbo.eu/s/9lN

Cheers, Brad

On Thu, May 14, 2015 at 9:03 AM, Steve Bower <[email protected]> wrote:
The Nepal Electric Authority would likely already have such a map, or relevant data:
http://www.nea.org.np/

Page 106 of their annual plan has a transmission line map:
http://www.nea.org.np/images/supportive_docs/Annual%20Report-2014.pdf

I did not find anything better in a quick search of their web site, but they could probably provide something.

Steve


On Thu, May 14, 2015 at 7:26 AM, Jean-Guilhem Cailton <[email protected]> wrote:
Hi,

As you may know, helicopters play a critical role in bringing help to
Nepalese people affected by April 25 7.8 earthquake, and May 12 7.4
aftershock, with roads blocked or made dangerous by landslides and
unstable terrain.

A USMC helicopter that was taking part in this effort is missing since
May 12. Other helicopters involved in the search and rescue mission
report that: "A primary concern for ongoing search and rescue efforts is
unmarked high tension power lines, which have been reported and bisect
many of the valleys in the search area".

Some high tension power lines have already been mapped
( http://overpass-turbo.eu/s/9lx , passed along to those conducting the
searches). Starting from electrical dams makes it easier to spot them.

If mappers experienced at mapping power lines could give a hand, this
would be great. (Or others willing to learn, like me :) ).

Bing is available for large parts of Nepal. A focus for current search
and rescue effort is around Ghorthali (27.7517 NÂ 86.0342 E) from where
a Nepalese local reported seeing a helicopter crash. But of course high
tension power lines would also be nice to have for Sindhupalchowk,
Dolakha and other affected districts (see
http://kathmandulivinglabs.github.io/quake-maps/).

(Please download and upload OSM data often, in case other mappers work
on the same theme).

Thanks,

Jean-Guilhem


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