[Imports] Akros Global Health, offset?

[Bjoern Hassler]

Hi Nate,

that's very helpful - many thanks!

Bjoern



On 17 May 2017 at 10:00, Nate Smith <nateasmith at gmail.com> wrote:

> Hi Bjoern - Based on my experience working on that import with Akros, I
> would say that matching the DG imagery is best. Bing and DG imagery was
> used for the original creation of the data before it was imported. The
> offset varied quite a bit across the region and DG was much better.
>
> Nate
>
>
> Nate Smith
> @nas_smith <https://twitter.com/nas_smith>
>
> On May 17, 2017 at 2:43:19 AM, Bjoern Hassler (bjohas+mw at gmail.com) wrote:
>
> Dear all,
>
> I'm looking at this buildings import,
> https://wiki.openstreetmap.org/wiki/Northern_Zambia_Buildings_Import
>
> For the buildings It includes buildings near Fiwila, -13.9710, 29.6019,
> Zambia.
>
> As well as East (e.g. -13.9762965, 29.5746642) and West (e.g. -13.970185,
> 29.6203484) of Fiwila.
>
> In Fiwila, the import matches Bing/DG imagery, and the road matches those
> too. Hwoever, East and West, there is a clear offset of about 20m East-West.
>
> The wiki page doesn't say how the data was collected. The wiki page states
> "The main goal of this work is to not only do a large import of buildings
> (268k records) into Zambia, but set an example for how Akros and other
> organizations can *use field based operations* to contribute back to
> OpenStreetMap. *Data was verified by Akros Global Health contributors
> with assistance from the USAID GeoCenter's Remote Sensing Program*." (my
> bold).
>
> So any thoughts on whether I should go by the Akros data (and offset
> Bing/DG) or whether I should adjust the Akros import (in that area) to
> match bing?
>
> Many thanks!
> Bjoern
>
>
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