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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Samuel,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It might be a good idea to simplify some
features before importing. It is not necessary for all features, and the
feature's node density usually varies by provinces/theme. In BC, hydro
network is really dense as you already figured out. In <st1:place w:st="on"><st1:State
w:st="on">Quebec</st1:State></st1:place>, the new road network often needs to by
simplified.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I would say just do it if it is required
for the tile/theme you are importing<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Daniel<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Samuel Longiaru [mailto:longiaru@shaw.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> February-11-11 10:38<br>
<b><span style='font-weight:bold'>To:</span></b> talk-ca@openstreetmap.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Talk-ca] Simplifying
CanVec imports</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Good Morning Everyone,<br>
<br>
For the past couple of weeks I have been importing CanVec data into an area southwest
of <st1:City w:st="on"><st1:place w:st="on">Kamloops</st1:place></st1:City>.
There was very little (if any) existing OSM data in the area. I've gotten
into a bit of a rhythm, merging and stitching all of 92I07 and about half of
92I10 but started becoming concerned about the high data density, particularly
associated with streams in the area. Most import files at the level of 92
I 07.0.0 for example, are runnning 10-15k nodes. At that rate, that is
somewhat near 200,000 nodes for an area at the level of 92I07.
Yikes! I guess the question in my mind is just how many data do we want
to import at this level and what are the practical implications for server
processing and overload. I expect that this level would be fairly
consistent across most of <st1:place w:st="on">Western Canada</st1:place>. Even
now, I haven't been able to call up a complete map in the openstreet.org view
tab for the past 4 or 5 days... 25-50% of the map being covered with "...
more OSM coming soon" tiles.<br>
<br>
I looked at the Simplify Way function in JOSM and applying it to just the water
data, have been able to eliminate 5-8k nodes from each file, thereby cutting
the data in nearly half. I really don't see any significant degradation
in the map quality as a result. Without simplifying, the data nodes in
some places are incredibly (and undeservedly ) dense. The only discussion
I've been able to find on the simplify tool is some rather old discussion that
took place during development. <br>
<br>
So just wondering if simplifying these data is a reasonable approach.
Right now, I am going back to the imported areas, calling them up from OSM,
simplifying the water, and re-uploading the simplified data. In the
future, I will just simplify in JOSM before uploading the file in the first
place. Anyway, does anyone have any issues with my approach here?
Is it worth simplifying or am I being overly concerned about data density
and its longer term implications?<br>
<br>
Thanks,<br>
<br>
Sam Longiaru<br>
<st1:place w:st="on"><st1:City w:st="on">Kamloops</st1:City>, <st1:State w:st="on">BC</st1:State></st1:place>
<o:p></o:p></span></font></p>
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