[Talk-ca] New user adding data, not sure what to do

Sat Sep 12 04:38:42 BST 2009

Ah, ok
(i dont have internet where i am right now) but i'll send a message
tomorow, hopefully he responds.
1 idea is that it could be canvec roads, as we know they dont connect.
Another ideas is it could be in JOSM as its easy to select a bunch of
stuff and paste which gets off-set if not done correctly.

Cheers,
Sam

On 9/11/09, Frank Steggink <steggink at steggink.org> wrote:
> Hi Sam,
>
> Thanks for responding. The issue here is not that there is a lot of
> data. This tile is pretty quiet. There were only 4500 elements (3620
> nodes and 880 ways).
>
> The problem is that I don't know what to do with the data contributed to
> the new user. It looks to be incorrect to me, although I'll have to
> verify that one way or another. Before I'm going to do anything about
> that, I'll await his response.
>
> B.t.w. my corrections are done. :)
>
> Frank
>
> Sam Vekemans wrote:
>> Hi Frank,
>> thanks for sharing :-)
>> This isn't the 1st time it happened, nor will it be the last....
>> (we'll make a nice FAQ sheet later)
>>
>> First off, are you using bulk_import? And trying to get road matcher
>> to find roads? (roadmatcher is nice BUT only for a quiet area)
>>
>> I would recommend this;
>> step 1: Create a complete .osm file for ALL the roads in your tile area.
>> 2 - upload this big file to mediafire and have a link available.
>> 3 -use JOSM and open that big .osm file
>> 4 - download the latest data for the  small area (as a new layer)
>> 5 manually copy the roads that you want and delete the roads that are
>> wrong.
>> 5 hide the big_roads.osm file and upload the changes.
>>
>> However, give a couple days for the user to respond, i'll message the
>> user and give access to the chart. (you also have ability to invite
>> people to edit BTW)
>>
>> So once this new user has access to it, i'd recommend a mapping party
>> and invite others. Then you all can get the whole tile copied, in 1
>> session.
>>
>> btw, on sunday i'll attempt to launch a uStream.tv broadcast, where
>> there is an option todo an 'on-screen demo' of what i talked about
>> above. (it will be recorded and posted with link)
>>
>> cheers,
>> Sam
>>
>>
>> On 9/11/09, Frank Steggink <steggink at steggink.org> wrote:
>>
>>> Hi list,
>>>
>>> I just _knew_ it would happen. As soon as I would start the Geobase
>>> import, some user would step up, and start adding data to the areas I'm
>>> about to import. And this is exactly what happened. To my surprise I
>>> discovered a whole lot of data southeast of Quebec City, in the
>>> Chaudière-Appalaches region: [1]. These are the NTS tiles 021L09, 10,
>>> 15, and 16.
>>>
>>> At first I was happy that there was some considerable activity in the
>>> Quebec region, other than my own. After examining the data, it comes
>>> from a user (Robert66) who has only joined us on Monday. Unfortunately
>>> this shines through his data as well: most of his roads are not
>>> connected, so that would involve a lot of cleanup. Apparently he had a
>>> blast this week: many small towns and villages were added. The data even
>>> has street names! See for example Montmagny: [2]. So, I've contacted him
>>> yesterday, in order to ask for more information. I haven't received a
>>> reply yet, but one day isn't that much.
>>>
>>> Because this area was on my todo list, I decided to continue with my
>>> import. Tile 021L10 ([3]) is on tonight's program. After the data was
>>> loaded, I noticed a concentration of roads in St. Damien [4], which I
>>> didn't see yesterday. Apparently Robert66 was busy adding it today, see
>>> changeset 2451637. When zooming in, I noticed that, while the data
>>> looked topologically correct (apart from the fact that the roads aren't
>>> connected), many roads are displaced, up to 150 m, compared to the
>>> Geobase data. See [5], screenshot of OpenJump. Brown=OSM, green=Geobase.
>>> I know that Geobase isn't the most accurate dataset, but in the area I
>>> have imported data, it generally matched my roads reasonably well. The
>>> differences are up to 30 meters, although there are some exceptions. An
>>> example is the main road in the St. Damien screenshot, going from SW to
>>> NE. It was originally added by me, nearly a year ago: [6], as well as a
>>> few residential roads.
>>>
>>> What I would like to know is: does anyone of you have a reasonable
>>> explanation as to how Robert66 has added his data? He has used Potlatch,
>>> and for that area there are no detailed Yahoo images. There is only one
>>> GPS trace of the main road. (It isn't mine: I'm using them only as a
>>> backdrop in JOSM.) I really hope he hasn't drawn the roads from memory,
>>> or some sketches, without the help of any GPS. Although I have traced
>>> only a few roads in St. Damien, I find it pretty odd that the roads I
>>> added myself are matching Geobase well, but the roads added by Robert66,
>>> are off up to 150 m!
>>>
>>> My hands are actually itching to override his data, and only reuse the
>>> names, but that isn't really in the spirit of the import. I also don't
>>> think that would be wise, because there is no clarity about how he got
>>> the data. I think I'll go visit St. Damien this weekend, and do my own
>>> survey. If I find out that Robert66's additions are indeed way off as
>>> the OpenJump screenshot implies, then I'll probably replace his roads.
>>> I'll wait for an answer from him first. Maybe he can use a bit of
>>> education :)
>>>
>>> As for my import, when I was writing this e-mail, I've uploaded the data
>>> from the standalone file, with bridges copied over, and some small
>>> corrections. See changeset 2452632. I've left out the residential roads
>>> in St. Damien. (Sam: there is even a note in your spreadsheet :) ) I'll
>>> cleanup the data, except for the St. Damien area. I'll follow a similar
>>> procedure for the rest of this entire area. Depending on the answer
>>> Robert66 can give me, I'll either leave his data in place, or add more
>>> Geobase roads, or eventually I'll survey those towns myself (which will
>>> be a lot of work).
>>>
>>> So, what do you think? Do you have any additional suggestions as how to
>>> handle this situation?
>>>
>>> Regards,
>>>
>>> Frank
>>>
>>> [1]
>>> http://www.openstreetmap.org/index.html?minlat=46.5&minlon=-71&maxlat=47&maxlon=-70&box=yes&layers=B000FTF
>>> [2] http://osm.org/go/cKbzIEER--
>>> [3]
>>> http://www.openstreetmap.org/index.html?mlat=46.625&mlon=-70.75&minlat=46.5&minlon=-71&maxlat=46.75&maxlon=-70.5&box=yes&layers=B000FTF
>>> [4] http://osm.org/go/cKawVZPY--
>>> [5] http://www.steggink.org/temp/St_Damien_QC.png
>>> [6] http://www.openstreetmap.org/browse/way/27080076/history
>>>
>>>
>>> _______________________________________________
>>> Talk-ca mailing list
>>> Talk-ca at openstreetmap.org
>>> http://lists.openstreetmap.org/listinfo/talk-ca
>>>
>>>
>>
>>
>>
>
>

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