<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap:break-word"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">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. </div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">Nate</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div> <br> <div id="bloop_sign_1495008275513106944" class="bloop_sign">Nate Smith<div><a href="https://twitter.com/nas_smith"><span style="color:rgb(0,0,0)">@nas_smith</span></a></div></div> <br><p class="airmail_on">On May 17, 2017 at 2:43:19 AM, Bjoern Hassler (<a href="mailto:bjohas+mw@gmail.com">bjohas+mw@gmail.com</a>) wrote:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
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<div style="font-size:12.8px">Dear all,</div>
<div style="font-size:12.8px"><br></div>
<div style="font-size:12.8px">I'm looking at this buildings
import, </div>
<div style="font-size:12.8px"><span style="font-size:12.8px"><a href="https://wiki.openstreetmap.org/wiki/Northern_Zambia_Buildings_Import">
https://wiki.openstreetmap.org/wiki/Northern_Zambia_Buildings_Import</a></span><br>
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<div style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div>
<div style="font-size:12.8px"><span style="font-size:12.8px">For
the buildings It includes buildings near Fiwila, -13.9710,
29.6019, Zambia.</span></div>
<div style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div>
<div><span style="font-size:12.8px">As well as East (e.g.
-13.9762965, 29.5746642) and West (e.g. -13.970185,
29.6203484) of Fiwila. </span><br></div>
<div><span style="font-size:12.8px"><br></span></div>
<div style="font-size:12.8px">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.</div>
<div style="font-size:12.8px"><br></div>
<div style="font-size:12.8px">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 <b>use field based operations</b> to contribute
back to OpenStreetMap. <b>Data was verified by Akros Global Health
contributors with assistance from the USAID GeoCenter's Remote
Sensing Program</b>." (my bold).</div>
<div style="font-size:12.8px"><br></div>
<div style="font-size:12.8px">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?</div>
<div style="font-size:12.8px"><br></div>
<div style="font-size:12.8px">Many thanks!</div>
<div style="font-size:12.8px">Bjoern</div>
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