[Talk-ca] ACQTECH vs. Valdate vs. OSM User imput for CanVec HD

[Sam Vekemans]

Hi,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

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.

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
http://downloads.cloudmade.com/north_america/canada#breadcrumbs


& 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.

http://wiki.openstreetmap.org/wiki/Hiking_Map

Here's that the area of discussion looks like on the cyclemap layer
http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=00B0FTF

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 :)

Cheers,
Sam Vekemans
Across Canada Trails

On Thu, Mar 12, 2009 at 9:53 AM, Calgary Trail Maps <
calgarytrailmaps at shaw.ca> wrote:

>  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.
>
> John
>
>  ------------------------------
> *From:* samvekemans at gmail.com [mailto:samvekemans at gmail.com] *On Behalf Of
> *Sam Vekemans
> *Sent:* March 12, 2009 10:35 AM
> *To:* simon at mungewell.org
> *Cc:* Calgary Area Trail Maps; Talk-CA OpenStreetMap; Jean-Sébastien; Dale
> Atkin; Richard Degelder
> *Subject:* Re: ACQTECH vs. Valdate vs. OSM User imput for CanVec HD
>
>  Hi Simon,
>
> So for the canvec data, it was recorded back in 1979 when the earth was
> flat .. lol :-)
> 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.
> If your GPS had a better accuracy, then best guess is all you can do.
>
> And John,
> Thanks, would u be able to upload all your GPX tracks to OSM? If not, i
> can upload that for you, on your request.
>
> Using JOSM, i just download all the local area GPS Traces, and i only see 1
> track (Simon's)
>
> And everyone,
>
> 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.
>
> And so, looking at the contour lines on the Cyclemap, it looks pritty good.
>
> Anyway,
> 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.
> So for some of them that are labeled... like "York Creek" it's hard to say
> what it is.
>
> I could change it so that "Watercourse, non isolated" is listed as a
> "stream" would that be better?
>
> Thanks,
> Sam
>
> P.S.
> 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.
> http://docs.google.com/Doc?id=d2d8mrd_179gnhs54cw
>
>
>
> On Thu, Mar 12, 2009 at 8:29 AM, <simon at mungewell.org> wrote:
>
>> > Hi, i have an area, which i found interesting.
>> > The York Creek (river) ish..
>>
>> Are you perhaps refering to this spot?
>>
>> http://www.openstreetmap.org/?lat=49.58793&lon=-114.5186&zoom=17&layers=B000FTF
>>
>> http://www.flickr.com/photos/24244464@N03/2777260804/in/set-72157606820699424/
>>
>> Where I sat with my doggie, having lunch on a fine afternoon last summer.
>>
>> Looking at the sources available to me (OSM, OSM-GPX, CatMP and Canvec),
>> it appears that the Canvec waterway (coded 1470171) is about 15m too far
>> west.
>>
>> That said, consumer GPS is not going to be very accurate. Look how the
>> (only!) GPX track is very noisy here. The only real way is to get multiple
>> GPS tracks going through the area an visually average/discount them to get
>> an approximately true location.
>>
>> One thing that we have on our side when looking at waterways, is that
>> water is lazy and will take the easy route. So if you look at this area
>> with a contour layer you might be able to confirm which of the waterways
>> is in the wrong place.
>>
>> Cheers,
>> Simon.
>>
>>
>
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