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 < [email protected]> 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 < > [email protected]> 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. >>> >>> 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.  >>> >>> 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.) >>> >>> Downslope (westward) from a likely reactivated slide located at >>> 85.81987,27.90810;9553423.739,3237391.771  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. >>> >>> One advantage of different acquisition angles is that some features may >>> be discernible on slopes that don't ordinarily show up very well. >>>  >>> 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.  >>> >>> Best regards, >>> >>> John >>> _______________________________________________ HOT mailing list >>> [email protected] https://lists.openstreetmap.org/listinfo/hot >>> >> >> >> _______________________________________________ >> HOT mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/hot >> > > > > -- > Prabhas Pokharel > http://prabhasp.com > twitter/skype/facebook/whatever: prabhasp >
_______________________________________________ HOT mailing list [email protected] https://lists.openstreetmap.org/listinfo/hot
