[HOT] Fwd: [OpenStreetMap] Alternative imagery project 2102

Daniel Specht danspecht at gmail.com
Wed Nov 9 05:43:47 UTC 2016


Hi,

I'm not sure why you would want to use imagery that doesn't show a large
percentage of buildings. The offset between the two images seems pretty
small, and while undesirable, not that big of a problem.

Dan

On Tue, Nov 8, 2016 at 2:12 PM, Chad Blevins <cblevins at usaid.gov> wrote:

> I modified the instructions in the task 2102
> <http://tasks.hotosm.org/project/2102>to hopefully help clarify the
> imagery problem.  This it was originally mapped using Bing, I suggest we
> validate using that source and use the service for cloudy or poor image
> quality areas.  I'm open to feedback of why this may or may not be a good
> approach.
>
> The idea of using one image source for new mappers is great, but so many
> parts of the world are cloudy.  It would be nice if the TM allowed cells to
> be marked as "cloudy", making it much easier to take Joost's approach.
>
> - Chad
>
> On Mon, Nov 7, 2016 at 12:15 PM, joost schouppe <joost.schouppe at gmail.com>
> wrote:
>
>> Ooh, sorry to jump to conclusions. It looked like a straightforward
>> problem at first glance.
>>
>> We've had similar challenges, where cloudy spots are mapped with
>> different imagery. Not only was there considerable change on the ground,
>> but also it was impossible to align the pictures because of the hilly
>> terrain. I'm afraid there's no easy solution.
>>
>> It does some likely that offering several imagery sources to newer
>> mappers is challenging. It might be better to just map what's possible with
>> one image, then create a new task to map what's left. Though that has it's
>> own problems too.
>>
>> 2016-11-07 15:17 GMT+01:00 Chad Blevins <cblevins at usaid.gov>:
>>
>>> Hi everyone,
>>>
>>> Thanks for the note, I created task 2102 and also provided the
>>> additional imagery service.  Unfortunately certain areas of the custom
>>> image service are offset from Bing and existing OSM data.  For this
>>> reason I purposely didn't load the custom service into the task, but
>>> offered it in the instructions to supplement clouds, etc.  These tasks
>>> are designed to get new mappers involved with OSM.  Offset imagery
>>> significantly raises the bar of entry and can introduce data quality
>>> issues.
>>>
>>> I've since noticed areas with significant change (buildings, trees,
>>> etc.) between the two images.  The service I provided is several years
>>> newer than Bing.  This highlights one major challenge with introducing
>>> new imagery in OSM.  It would be great if traced features were
>>> automatically tagged with the date/year of the service used.
>>>
>>> Before creating a custom service I check Bing for date/year, cloud
>>> cover, and quality.  If Mapbox isn't a good supplement then I search
>>> for other scenes from the DG archive, and do my best to find a recent
>>> cloud free scene that aligns with Bing.  I'm open to suggestions on
>>> the best way to proceed.
>>>
>>> Thanks,
>>> Chad
>>>
>>>
>>>
>>> > On Nov 7, 2016, at 7:21 AM, Blake Girardot HOT/OSM <
>>> blake.girardot at hotosm.org> wrote:
>>> >
>>> > Hi Joost, Mike, Daniel,
>>> >
>>> > Joost is of course correct. In looking at the project in the TM, it is
>>> > not clear which imagery should be preferred for mapping, it might be
>>> > on purpose the other imagery is not in the imagery field.
>>> >
>>> > I sent an email via OSM to the project creator to see if we can
>>> > clarify the instructions a bit and put the other imagery in the
>>> > imagery field if it should be used.
>>> >
>>> > Thank you for pointing it out Daniel.
>>> >
>>> > Regards,
>>> > Blake
>>> > ----------------------------------------------------
>>> > Blake Girardot
>>> > Humanitarian OpenStreetMap Team
>>> > skype: jblakegirardot
>>> > HOT Core Team Contact: info at hotosm.org
>>> >
>>> >
>>> > On Mon, Nov 7, 2016 at 11:32 AM, joost schouppe
>>> > <joost.schouppe at gmail.com> wrote:
>>> >> That shouldn't be necessary though.
>>> >>
>>> >> When you set up a task in the tasking manager, there is a tab to set
>>> the
>>> >> background imagery. Doing this ensures the custom imagery is loaded as
>>> >> default in ID. I don't know who managed the task, but they should be
>>> >> informed that this is a really useful thing to do.
>>> >>
>>> >>
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>>
>>
>>
>> --
>> Joost @
>> Openstreetmap <http://www.openstreetmap.org/user/joost%20schouppe/> |
>> Twitter <https://twitter.com/joostjakob> | LinkedIn
>> <https://www.linkedin.com/pub/joost-schouppe/48/939/603> | Meetup
>> <http://www.meetup.com/OpenStreetMap-Belgium/members/97979802/>
>>
>
>
>
> --
> *Chad Blevins*
> GeoCenter
> U.S. Global Development Lab
> USAID
> 202-712-0464
> Internal GeoCenter Website (USAID Only)
> <https://sites.google.com/a/usaid.gov/usaidgeocenter/home>
>



-- 
Dan
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