Hi Michal,
HOT did not make Building damage assessments for Nepal, letting other groups
outside OpenStreetMap taking care of this, and avoiding duplication of efforts.
Coordination among various groups should be an important aspect of such
assessments to progress rapidly and efficiently. We also have to clarify the
objectives of Damage asssessments from aerial imagery. There are texts that
describe objective of assessment from imagery vs from field data collection.
Assessments from imagery is more to identify priority zones then individual
buildings. Field data collection let's identify precisely the damaged buildings
and the type of damage.
For the OSM Response, we identified IDP camps in Kathmandu (Informal tent
camps). This task went well and was done rapidly.
A second task was to identify potential helicopter landing zones.
The third task was about outlining villages in remote mountainous areas where
severe damages could be identified. Contributors had more difficulty with this
task and it progressed slowly, was never totally completed.
Questions1. No since not the same type of tasks2/4. links to all images used
are in the Task Manager Instructions
regard
Pierre
De : Michal Bodnár <[email protected]>
À : John Fortier <[email protected]>
Cc : HOT Openstreetmap <[email protected]>
Envoyé le : Dimanche 8 novembre 2015 9h36
Objet : Re: [HOT] OSM Damage Assessment
*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 <[email protected]> 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 <[email protected]> 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>
>>
>>
>> _______________________________________________
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>>
>
>
>
--
Michal Bodnár, M.Eng. PhD Researcher at Beihang University/NDRCC Coordinator at
Standby Task Force
China +8613031164554| Czech republic +420 607957528Find me on: LinkedIn
Facebook Twitter Alumni at CTU - Czech Technical University, Prague www.cvut.cz
Geomatics @CTU
Alumni at BEST (Board of European Students of Technology) www.best.eu.org
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