<div class="gmail_quote"><div>I think he's aware that we can't use Google Earth, nor did he ever say
to. He was just saying that his GPS tracks met up with the actual path
when overlayed on the Google imagery, meaning that his tracks are
probably more accurate.<br>
<br>About the waterways - I think many of the waterways (smaller ones)
were just traces of aerial imagery onto the topo maps. Waterways are
too much of a pain to do by GPS on such a large scale so I couldn't see
them being too accurate, unless you get a municipality's watershed
layers which I've found to be very accurate and detailed, but those
aren't available to the public or under the CC so it doesn't matter
anyways. For all we know the federal data could have been
aerial-->paper topo-->digitized, meaning it could be very
innacurate. I don't know what the metadata says since I'm at work and
can't (shouldn't) access it, so I don't know if it says in there what
the source is. I think a user who knows the area should be the one who
decides what should happen to the waterway or at least compare the bot
loaded data with the aerial imagery that's already available to decide
which is nearest to the actual location.<br>
<br clear="all">-Kevin (Kevo) <br><br>p.s. sorry for sending twice sam, i always forget to press reply all.<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br><br><div class="gmail_quote"><div><div></div><div class="h5">On Thu, Mar 12, 2009 at 1:16 PM, Sam Vekemans <span dir="ltr"><<a href="mailto:acrosscanadatrails@gmail.com" target="_blank">acrosscanadatrails@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5">
Hi,<div>Ya we (the OSM community) dont use Google Earth (because the map isn't free, you cant take a printed map of Google Earth/Google Maps and print it in Books. .. you can with OpenStreetMap.org</div><div><br></div>
<div>By submitting your original GPX tracks to OSM, you then help build the larger map of the world, the more original GPS tracks that get added to the area, the more likely and easier it is to accurately tell what map features are more accurate. </div>
<div><br></div><div>The map that your making (yes, it is useful) however, the OpenCycleMap currently available, is also available to download as a garmin map from Cloudmade </div><div><a href="http://downloads.cloudmade.com/north_america/canada#breadcrumbs" target="_blank">http://downloads.cloudmade.com/north_america/canada#breadcrumbs</a><br>
</div><div><br></div><div><br></div><div>& the OpenHikingMap is currently in progress which takes the OSM map features and tones down the highways so then all the trails stand out more. Also, all the things relevant to Hiking will also be shown.</div>
<div><br></div><div><a href="http://wiki.openstreetmap.org/wiki/Hiking_Map" target="_blank">http://wiki.openstreetmap.org/wiki/Hiking_Map</a><br></div><div><br></div><div>Here's that the area of discussion looks like on the cyclemap layer</div>
<div><a href="http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=00B0FTF" target="_blank">http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=00B0FTF</a><br>
</div><div><br>
</div><div>But of course, if your not into contributing to OSM directly, im sure Simon would be able to help out again, and import the latest version of your .mp map when it's ready :)</div><div><br></div><div>Cheers,</div>
<div>Sam Vekemans</div><font color="#888888"><div>Across Canada Trails</div></font><div><div></div><div><div><br></div><div><div class="gmail_quote">On Thu, Mar 12, 2009 at 9:53 AM, Calgary Trail Maps <span dir="ltr"><<a href="mailto:calgarytrailmaps@shaw.ca" target="_blank">calgarytrailmaps@shaw.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">The current OSM data is from my maps, which are based on my
tracks, other than the ATV bridge which someone else added. You can see
them clearly in Google Earth. I'm working on cleaning this area up for my
next release and I'll clean it up a bit more.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">John</font></span></div><br>
<div dir="ltr" align="left" lang="en-us">
<hr>
<font size="2" face="Tahoma"><b>From:</b> <a href="mailto:samvekemans@gmail.com" target="_blank">samvekemans@gmail.com</a>
[mailto:<a href="mailto:samvekemans@gmail.com" target="_blank">samvekemans@gmail.com</a>] <b>On Behalf Of </b>Sam Vekemans<br><b>Sent:</b>
March 12, 2009 10:35 AM<br><b>To:</b> <a href="mailto:simon@mungewell.org" target="_blank">simon@mungewell.org</a><br><b>Cc:</b> Calgary
Area Trail Maps; Talk-CA OpenStreetMap; Jean-Sébastien; Dale Atkin; Richard
Degelder<div><br><b>Subject:</b> Re: ACQTECH vs. Valdate vs. OSM User imput for
CanVec HD<br></div></font><br></div><div><div></div><div>
<div></div>
<div>Hi Simon,</div>
<div><br></div>
<div>So for the canvec data, it was recorded back in 1979 when the earth was
flat .. lol :-)</div>
<div>it also says that the technique is "vector data" . ... it also says the
planimeteric accuracy is "19" that would be 'meters' ... so your statement of
'15 meters' off makes the canvec data also 'right' in it's own sence.</div>
<div>If your GPS had a better accuracy, then best guess is all you can do.</div>
<div><br></div>
<div>And John,</div>
<div>Thanks, would u be able to upload all your GPX tracks to OSM?
<div>If not, i can upload that for you, on your request.</div>
<div><br></div>
<div>Using JOSM, i just download all the local area GPS Traces, and i only see 1
track (Simon's)</div></div>
<div><br></div>
<div>And everyone,</div>
<div><br></div>
<div>Well, i "think" when it says "GPS" as the source, would be from a 'trimble
differencial unit" (but not sure) .. and so, when canvec says it's a "7 Field
completion" then we could says it's as accurate as any mapper account.</div>
<div><br></div>
<div>And so, looking at the contour lines on the Cyclemap, it looks pritty
good.</div>
<div><br></div>
<div>Anyway,</div>
<div>I fixed the script so it reads as a "river" thats because it's a
"Watercourse, non isolated" for the "Watercourse, isolated" thats when i list it
as a "stream" and for all the "other" and "unknown" I list it as a "stream" so
then they can be manually upgraded.</div>
<div>So for some of them that are labeled... like "York Creek" it's hard to say
what it is.</div>
<div><br></div>
<div>I could change it so that "Watercourse, non isolated" is listed as a
"stream" would that be better?</div>
<div><br>Thanks,</div>
<div>Sam</div>
<div><br></div>
<div>P.S.</div>
<div>I now need to go over the whole set again and fix up the wiki charts.
Hopefully in the next few days it will be better. ... but of course, im always
looking for errors. anyway i published the rules.txt file and added the
'date-time stamp' from notepad so you can see how old it is.</div>
<div><a href="http://docs.google.com/Doc?id=d2d8mrd_179gnhs54cw" target="_blank">http://docs.google.com/Doc?id=d2d8mrd_179gnhs54cw</a><br></div>
<div><br></div>
<div><br></div>
<div><br>
<div class="gmail_quote">On Thu, Mar 12, 2009 at 8:29 AM, <span dir="ltr"><<a href="mailto:simon@mungewell.org" target="_blank">simon@mungewell.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div>> Hi, i have an area, which i found interesting.<br>> The York
Creek (river) ish..<br><br></div>Are you perhaps refering to this spot?<br><a href="http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=B000FTF" target="_blank">http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=B000FTF</a><br>
<a href="http://www.flickr.com/photos/24244464@N03/2777260804/in/set-72157606820699424/" target="_blank">http://www.flickr.com/photos/24244464@N03/2777260804/in/set-72157606820699424/</a><br><br>Where
I sat with my doggie, having lunch on a fine afternoon last
summer.<br><br>Looking at the sources available to me (OSM, OSM-GPX, CatMP and
Canvec),<br>it appears that the Canvec waterway (coded 1470171) is about 15m
too far<br>west.<br><br>That said, consumer GPS is not going to be very
accurate. Look how the<br>(only!) GPX track is very noisy here. The only real
way is to get multiple<br>GPS tracks going through the area an visually
average/discount them to get<br>an approximately true location.<br><br>One
thing that we have on our side when looking at waterways, is that<br>water is
lazy and will take the easy route. So if you look at this area<br>with a
contour layer you might be able to confirm which of the waterways<br>is in the
wrong
place.<br><br>Cheers,<br>Simon.<br><br></blockquote></div><br></div></div></div></div>
</blockquote></div><br></div>
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</blockquote></div><br>