[HOT] OSM Damage Assessment

Sun Nov 8 08:36:31 UTC 2015

*In this email I am asking for a help from HOT community regarding my
research. If it is not of your interest, you may ignore it. Thank you very
much*

Dear HOT community,

it has been a long time since I have written the first email which started
this thread, but as I have been extremely busy over last period of couple
of months, I am just starting now to dig into this again. And I would like
to ask for your help, if you do not mind.

So a small recap - I am planning on conducting a research on the quality
assessment of the different damage assessments that were undertaken for the
Nepal earthquake. Concretely, I would like to focus on conducting a
validation studies on how crowdsourcing tools/organizations/campaigns, such
as Tomnod and HOT are "good enough" in producing damage assessment. On the
other side, I have the data coming from UNOSAT/Copernicus and NGA. I would
like to do variety of the studies, meaning firstly I would like to compare
Tomnod and HOT results to the reference data separately. Then I would like
to compare HOT and Tomnod between each other and finally I would like to
compare then with UNOSAT/Copernicus and NGA results. Couple of questions
are arising from my side and I think some of you here are capable of
helping me out:

1. Is it "meaningful" to make a comparison between the results from Tomnod
and HOT? Because as I know, Tomnod results were categorized differently
than HOT ones, but probably I could just choose one category (damage
buildings, for instance) and focus on this.

2. Does anyone have an access to the good reference data and willingness to
share it? By that I mean field survey data, aerial imagery or even UAV
data.

3. If I do not have any of the reference data sources mentioned in question
no.2, do you think I could use UNOSAT/Copernicus or NGA results as
reference data instead? I have read some papers in which it was done like
that.

4. Anyone that has saved in his local storage (or online access to) the
pre-event and post-event imagery of Nepal earthquake that were used for HOT
assessment? I would need that data in order to load them to my GIS
software.

Again, thank you very much for any kind of help or recommendation. I am
very much open to the discussion and I hope this study could be useful for
HOT community itself as well. And if you think another somewhat related
study should be made as well, please come up with the suggestions as well.

Cheers from Beijing,
Michal.

On 4 July 2015 at 20:43, John Fortier <jfortiernotes at icloud.com> wrote:

> Good Morning
> Sounds interesting.
> Can I help.
> I've had over 40 years experience in hazardous materials management, built
> environment and geotechnology.
> J
> John Fortier
> TrekMatics
>
> > On Jul 3, 2015, at 9:26 AM, Blake Girardot <bgirardot at gmail.com> wrote:
> >
> > Hi Michal,
> >
> > This is a somewhat complicated topic.
> >
> > Just for clarity: Humanitarian OpenStreetMap Team (HOT) and
> OpenStreetMap (OSM) are closely related, but separate organizations.
> >
> > HOT would be the group actually doing any damage assessments. We
> probably would be using OpenStreetMap (OSM) to store that damage assessment
> data or we might find another data store for that information, but for
> Nepal, the mapping related to damage we did, we stored in OSM.
> >
> > But HOT and OSM are separate organizations, even though we (HOT) rely on
> OSM to do our work and follow OSM conventions and guidelines for all the
> mapping we do.
> >
> > So talking about OSM damage assessments would not be the best way to
> refer to them.
> >
> > They would be HOT damage assessments stored in OSM. I only mention this
> very subtle distinction because as a researcher I want you to have the most
> accurate understanding possible and people often confuse the relationship
> between HOT and OSM.
> >
> > We did not do detailed damage assessments for Nepal. What we did map
> were areas that appear to have been completely destroyed by the earthquake.
> >
> > This was at a very macro scale, so the small settlement, neighborhood or
> block level.
> >
> > We did not do any specific damage grading or building level analysis.
> >
> > Basically we compared pre- and post-event imagery and tried to determine
> if settlements and buildings that appeared in the pre-event imagery were
> still there in the post-event imagery.
> >
> > If it looked like buildings have been totally destroyed and no longer
> appeared as buildings in the post-event imagery, we drew a polygon around
> that area and tagged it as a "landuse=brownfield" and
> "damage:event=nepal_earthquake_2015"
> >
> > You can read the exact methodology we used in one of the Projects we
> created to do the mapping in the "Instructions" tab of this project:
> > http://tasks.hotosm.org/project/1060
> >
> > All of the data we have generated should be in the 30 mins updates and
> you can find those polys by looking for the two key=value pairs I mentioned
> above.
> >
> > Another way to get just the areas marked as I described is to use the
> overpass-turbo.eu export tool.
> >
> > Use the query wizard to generate a query like this:
> >
> > landuse=brownfield and "damage:event"="nepal_earthquake_2015" in nepal
> >
> > It is a lot of data for a web browser to render so expect your browser
> to be non responsive at times. But you can then use the "Export" button to
> get the data in several formats.
> >
> > Here is a link to that query: http://overpass-turbo.eu/s/afm
> >
> > I would very roughly estimate that we have completed about 50% of the
> areas we have targeted to do those assessments on.
> >
> > As to the usability of the data generated, I think it served its
> intended purpose very well, which was to give a rough idea of where damage
> is likely to have occurred when very little other information was
> available. I think it might be used in the extended recovery phase as well,
> but I am less familiar with how it will be used in that phase.
> >
> > We are in the process of working with our partners on the ground to
> determine if we need to continue the process of identifying these areas and
> what the priority is.
> >
> > Any feedback, correlations, or on the ground evaluations of the accuracy
> of damage related data we generated would be most welcome and we will do
> what we can to help you do any evaluations of our assessments.
> >
> > Thank you very much for writing us, please let me know if you have any
> more questions or we can help you with your investigations any further.
> >
> > Cheers,
> > Blake
> >
> >
> >
> >> On 7/2/2015 7:55 PM, Michal Bodnár wrote:
> >> Hello HOT community,
> >>
> >> I am currently doing a research where I am validating and comparing
> >> different types of damage assessments of Nepal EQ - UNOSAT/Copernicus,
> >> Tomnod, Ushahidi (a special case) and I would like OSM damage assessment
> >> to be researched as well.
> >>
> >> I would have therefore some questions:
> >> 1. What everything is being mapped in terms of damage assessment? I have
> >> noticed landslides and damaged buildings.
> >> 2. In case of buildings, is there any classification of the level of
> >> damage being made (e.g. EMS-98 scale)?
> >> 3. How is the progress of the damage assessment so far? Do you think
> >> that the current status of DA is already enough "good" to be used?
> >> 4. How can I download all the damage assessment data in one package? I
> >> noticed the links for 30 minutes updates of the data, but that does not
> >> (as far as I know) include DA data.
> >>
> >> I would like to thank you in advance for any answer.
> >>
> >> Wish you all a great day,
> >> Michal.
> >> --
> >> Michal Bodnár, M.Eng.
> >> PhD Researcher at Beihang University/NDRCC
> >> China +8613031164554| Czech republic +420 607957528
> >> Find me on: LinkedIn
> >> <http://cn.linkedin.com/pub/michal-bodn%C3%A1r/42/aa/24a> Facebook
> >> <https://www.facebook.com/michal.bodnar> Twitter
> >> <https://twitter.com/michalbodnar>
> >> Alumni at CTU - Czech Technical University, Prague www.cvut.cz
> >> <http://www.cvut.cz/>Geomatics @CTU <http://geomatics.fsv.cvut.cz/en/>
> >> Alumni at BEST (Board of European Students of Technology)
> >> www.best.eu.org <http://www.best.eu.org>
> >>
> >>
> >> _______________________________________________
> >> HOT mailing list
> >> HOT at openstreetmap.org
> >> https://lists.openstreetmap.org/listinfo/hot
> >>
> >
> >
> >
>

-- 
Michal Bodnár, M.Eng.
PhD Researcher at Beihang University/NDRCC
Coordinator at Standby Task Force <http://blog.standbytaskforce.com/>
China +8613031164554| Czech republic +420 607957528
Find me on: LinkedIn
<http://cn.linkedin.com/pub/michal-bodn%C3%A1r/42/aa/24a> Facebook
<https://www.facebook.com/michal.bodnar> Twitter
<https://twitter.com/michalbodnar>
Alumni at CTU - Czech Technical University, Prague www.cvut.cz Geomatics
@CTU <http://geomatics.fsv.cvut.cz/en/>
Alumni at BEST (Board of European Students of Technology) www.best.eu.org
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