Nicholas,
I have noticed your work adding numerous building footprints in
the Fredericton area. It's great to see somebody taking on this large task. It
has been my experience that the older Bing imagery was better aligned than the
current Bing imagery in the Fredericton area. I have been mapping in the
Fredericton area since 2007 and the older Bing imagery aligned nicely with my
GPS traces. It is best to align the new Bing Imagery with OSM streets and GPS
traces. The misalignment of the Bing imagery varies across the Fredericton
area so I would readjust the alignment of the Bing Imagery as you move to new
neighborhoods. It is my practice to always adjust the Bing Imagery each time I
start a new Potlatch 2 session and readjust when I move to new areas of the
Fredericton region.
This map I built at arcgis.com may help shed some light on the
alignment issue.
http://www.arcgis.com/apps/Compare/Configure/index.html?appid=c0f0ca089e23457082e997dceea0061b
Cheers,
Bernie.
--
Bernie Connors, P.Eng
bernie.conn...@unb.ca<mailto:bernie.conn...@unb.ca>
New Maryland, NB
From: nicholas ingalls [mailto:nicholas.inga...@gmail.com]
Sent: Tuesday, 2013-01-01 19:23
To: talk-ca@openstreetmap.org
Subject: [Talk-ca] Fredericton WMS Offset
Hello all,
I've been recently drawing all of the buildings in Fredericton in preparation
for going around and collecting the addresses. I'd noticed that all the
buildings in Fredericton were offset. Naturally I assumed that the original
mappers in Fredericton had done this offset on purpose. I recently tested this
against GPS traces and found that the offset was incorrect based on the traces
I collected. I'm now assuming that this data was traced from the old Yahoo
imagery and current users continue to offset the Bing WMS to match the data
traced from the Yahoo imagery.
I am proposing that we shift the data back to match the Bing WMS and the gps
traces. Does anyone else from the Fredericton area have any comments, or can
explain the offset?
Cheers,
ingalls
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