[HOT] landslides and imagery

john o'l ol.john.el at gmail.com
Mon May 11 22:09:28 UTC 2015


Well I think I'm rapidly approaching the end of the window I had to work
with this and figure out how to add it to osm, if anyone else wants to try,
go for it.  In the meantime, I just figured out how to turn it into a kml,
it contains sites in addition to those mapped by British Geological Survey,
Durham University, ICIMOD, NASA-JPL, Univ. of Arizona -- though one
coincides: theirs: 20150508_hazard_db:FID 120 this eq_kml_shp:id -80 and
eq_kml_shp:id -81. Their db is available at:
https://data.hdx.rwlabs.org/dataset/lands

This kmz here (rougher than I'd like but it will have to do... )  All the
best, John


On Mon, May 11, 2015 at 8:59 AM, john o'l <ol.john.el at gmail.com> wrote:

> Also linking a website with links to a report on the Oso landslide as it
> is somewhat familiar to me
> http://www.geerassociation.org/GEER_Post%20EQ%20Reports/Oso_WA_2014/index.html
> For our purposes, some of the key points made are:  the initial phase of
> the slide (most destructive/fastest and most distant runout) -- was an old
> slide that had remobilized. 200 vertical meters of material which covered a
> horizontal distance of 1000 meters.  So existing landslides can remain very
> dangerous for a considerable period of time.  The 1 km runout, (or
> "deposit" keeping with the tagging scheme I proposed  "area = deposit") was
> not extraordinary based on volume of material, however it was extraordinary
> relative to most peoples' perceptions -- I doubt anyone seriously
> considered that a hillside that low and distant could be an active risk to
> an area as far away as the main highway corridor.
>
> After mapping some more landslides to my local machine but yet to upload
> any to OSM, I'd like to update my proposed OSM tagging scheme:
>
> hazard_type = landslide
> hazard_prone = yes
> area = scarp OR deposit
> damage:event = nepal_earthquake_2015 OR pre_nepal_earthquake_2015
> barrier = scarp OR deposit
> source = DigitalGlobe, 2015-05 OR other as appropriate
> landuse = brownfield
>
> Cheers,
>
> John
>
> On Mon, May 11, 2015 at 8:00 AM, john o'l <ol.john.el at gmail.com> wrote:
>
>> Thanks Prabhas,
>>
>> Very interesting! Yesterday I was directed to the Earthquakes Without
>> Frontiers blog http://ewf.nerc.ac.uk/blog/ and a map linked from their
>> May 8 post
>> http://ewf.nerc.ac.uk/wp-content/uploads/2015/05/Landslide_Update_2_08052015_SMALL.jpg,
>> apparently higher resolution is also available..
>>
>> Cheers,
>> John
>>
>> On Mon, May 11, 2015 at 7:10 AM, Prabhas Pokharel <
>> prabhas.pokharel at gmail.com> wrote:
>>
>>> Another email to add to the list for those interested in doing landslide
>>> mapping:
>>> We at KLL were forwarded this landslide risk assessment layer:
>>> https://www.google.com/maps/d/u/0/viewer?mid=z6HUO2aILzmQ.kGtOdlu45GXY&usp=sharing
>>> which comes from here:
>>> https://sites.google.com/a/umich.edu/nepalearthquake/landslide-maps
>>>
>>> It may help those of us interested in finding lanslides have some areas
>>> of high risk where they could start looking.
>>>
>>> cheers,
>>> Prabhas
>>>
>>> On Sun, May 10, 2015 at 11:50 AM, Springfield Harrison <
>>> stellargps at gmail.com> wrote:
>>>
>>>> Hello John,
>>>>
>>>> With reference to your moving boulder, just wondering if that could be
>>>> in fact moving, i.e., not an image based coordinate shift as such.  I'm
>>>> just thinking that with aftershocks and general instability, many of these
>>>> new features are still sorting themselves out and traveling downhill.
>>>>
>>>> Can DG or Bing make stereo pairs available?  Likely a long shot, but
>>>> thought I would ask.
>>>>
>>>>                 Cheers . . . . . . . . Spring Harrison
>>>>
>>>>
>>>> At 09-05-2015 17:49 Saturday, john o'l wrote:
>>>>
>>>>> I've been focusing on landslides and have located several score that
>>>>> appear recent. Of these, a few are pre-quake and appear relatively stable,
>>>>> some are pre-quake but appear reactivated and many appear to have been
>>>>> associated with the quake and/or aftershocks. I've mapped several dozen of
>>>>> these so far. In my next email, I'll cover why you won't find them in
>>>>> osm... yet. For this one, I'd like to stick to post quake imagery and some
>>>>> of its quirks.Â
>>>>>
>>>>> There is an inhabited hillside that had numerous landslides, some
>>>>> predate the quake, but most are presumably related. So far I've mapped
>>>>> about half of them, those that are largest or appear to threaten buildings
>>>>> and pathways. There is Digital Globe imagery available from May 3 and May
>>>>> 8. It looks like QGIS easily operates with more than one coordinate system
>>>>> at a time. The center of a large boulder in the May 3 imagery (Longitude,
>>>>> Latitude; WGS84 EPSG:3857 x,y) is at
>>>>> 85.85659,27.83609;9557511.789,3228324.329, in the May 8 imagery it is at
>>>>> 85.85669,27.83656;9557522.728,3228382.865. Mind you, this is not a
>>>>> complaint, rather it is a concrete example of the variability with this
>>>>> recent imagery. Â
>>>>>
>>>>> A more extreme example is a slide that appeared to be partially
>>>>> blocking a stream in the May 3 imagery 85.90258,27.87818;9562631.312,
>>>>> 3233623.303; -- it was completely obscured by a hillside in the May 8
>>>>> imagery (probably taken from a more northerly or northwesterly vantage
>>>>> point.)Â
>>>>>
>>>>> Downslope (westward) from a likely reactivated slide located at
>>>>> 85.81987,27.90810;9553423.739,3237391.771 Â is a remote area that
>>>>> appears very hard hit. The May 8th imagery is mostly clouds, but the May
>>>>> 3rd imagery shows a blue rooftop at
>>>>> 85.80644,27.90818;9551929.301,3237402.414, it looks like there are several
>>>>> large boulders in the immediate area and there is not much left to tell
>>>>> there were more than 20 buildings nearby. While the boulders may have
>>>>> contributed, at the moment I think it is probable that the shaking itself
>>>>> was mostly responsible for the extreme level of destruction.Â
>>>>>
>>>>> One advantage of different acquisition angles is that some features
>>>>> may be discernible on slopes that don't ordinarily show up very well.Â
>>>>> Â
>>>>> Question to the HOT folks -- is there a way to specify the date of DG
>>>>> imagery we access through the proxy server?, Some of the May 8 imagery is
>>>>> starting to come up over the May 3 imagery without me telling it to. Â
>>>>>
>>>>> Best regards,
>>>>>
>>>>> John
>>>>> _______________________________________________ HOT mailing list
>>>>> HOT at openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> HOT mailing list
>>>> HOT at openstreetmap.org
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>>>>
>>>
>>>
>>>
>>> --
>>> Prabhas Pokharel
>>> http://prabhasp.com
>>> twitter/skype/facebook/whatever: prabhasp
>>>
>>
>>
>
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