[HOT] Fwd: [OpenStreetMap] Alternative imagery project 2102
cblevins at usaid.gov
Tue Nov 8 22:12:12 UTC 2016
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.
On Mon, Nov 7, 2016 at 12:15 PM, joost schouppe <joost.schouppe at gmail.com>
> 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
>> 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.
>> > 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
>> >> 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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