[HOT] Valparaíso, Chile Fires Response / Respuesta a Fuegos en Valparaíso, Chile
andrew.r.buck at gmail.com
Wed Apr 16 22:03:35 UTC 2014
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Here is a map showing some early results from the OSM task manager
jobs to trace the buildings and a polygon I made by tracing an image
of the burn area posted online. The red buildings are ones which are
in the area burned by the fire and the yellow ones are ones which are
on steep slopes.
Thanks to everyone who took part in tracing all the roads and
buildings in the task manager jobs so far (there is still a bit more
to do on the eastern one but they are nearly done).
It would be good to also try to trace the rest of the streams in these
areas as flash flooding and landslides could cause problems in the
future due to the lack of vegetation causing increased soil erosion.
We will continue to monitor the situation for new developments and
continue improving the map, but the bulk of the mapping that needs to
be done is now complete. The LandSat 8 satellite should make a pass
over the city on the 22nd of April, so when it does we can get a
detailed tracing of area burned by the fire and update the landuse in
the area accordingly.
Also, as a final aside, someone should start a page on the wiki for
this HMP if there has not already been one. My suggestion would be to
copy the page for the West Africa Ebola Response and then just delete
the text portion of the content but leave the basic pieces there.
On 04/16/2014 07:47 AM, Banick, Robert wrote:
> Fantastic stuff Andrew. Julio, may I ask whether anyone from OSM
> Chile is in touch with ONEMI or any other response agencies in
> Chile? Surely Andrew's analysis would be of value to them.
> Robert Banick | Field GIS Coordinator | International Services |
> American Red Cross 2025 E Street NW, Washington, DC 20006
> -----Original Message----- From: Andrew Buck
> [mailto:andrew.r.buck at gmail.com] Sent: Wednesday, April 16, 2014
> 1:45 AM To: Banick, Robert; HOT at OSM (Humanitarian OpenStreetMap
> Team); Julio Costa Zambelli Subject: Re: [HOT] Valparaíso, Chile
> Fires Response / Respuesta a Fuegos en Valparaíso, Chile
> Hey everyone,
> I spoke for a couple hours on skype screenshare with Álvaro Monares
> who is local to Chile and we made some progress on situational
> awareness for this response. Most importantly, there is a satelite
> image posted online taken the 13th of April (right while the fire
> was burning but before it got to the populated areas). Although
> the license of the image is not suitable for tracing in OSM I did
> load it up in QGIS and traced 3 very rough polygons around where
> the fire area burned as of the 13th.
> I then uploaded these polygons to a umap layer that we can use to
> plan out where to focus our mapping efforts. The map below shows
> the definite burned areas in red and the areas we are pretty sure
> burned on the 14th in yellow (click on the areas for more details).
> You can also see the blue dotted lines showing the two task manager
> jobs already created for this job (click on the blue dotted lines
> for links to these jobs).
> Here is the link to the umap:
> We also downloaded several Landsat 8 images to try to map landuse
> and to see what could be seen. There is a mostly cloud free image
> (at least for the area we are interested in) from about a week
> before the fire but that still just shows the forest and whatnot
> the same as we see in the Bing imagery. More interesting is a
> LandSat 8 image taken the 15th, however there is a cloud mass
> covering exactly the area we are interested in for that image. The
> next Landsat pass will be on April 22nd so we will have to wait a
> few days before that imagery becomes available. We should monitor
> this situation and process this image as soon as it becomes
> We also checked through the MODIS daily fire map data and landuse
> data, however this is too low resolution to be of use (500 meters
> per pixel).
> Finally, we downloaded the ASTER elevation data for the area.
> Since the areas that burned are very hilly terrain with lots of
> steep canyons and valleys, there will now be a very high risk of
> flash flooding, soil erosion, and landslides in the area where the
> fire burned. I used the ASTER elevation file to produce a slope
> map and then downloaded the OSM building data and for each building
> I had QGIS calculate the slope of the ground that the building sits
> on. This will allow us to see where there are buildings in areas
> at risk for landslides and we can do a similar analysis to see
> where buildings might be at risk of flash flooding. These high
> risk areas should receive special attention in the mapping process
> to help recovery teams work safely in the affected areas.
> Good work to everyone so far on the tracing. The first job is
> almost completely done and the second was at about 60% I think. I
> am going to bed for the night, but I will take another look at the
> QGIS analysis tomorrow to see what I can put together for a risk
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