[Talk-ca] Lake Simcoe - two versions?

G. Michael Carter mikey at carterfamily.ca
Mon May 30 22:04:54 BST 2011


Barrie area was probably my import before we had OSM files from CanVec.
Can't remember.  I think the duplicate is because at the time I couldn't get
an answer on what to do with the coastline.  But since the lake is self
contained it can probably be deleted.

Michael

On Mon, May 30, 2011 at 4:33 PM, Frank Steggink <steggink at steggink.org>wrote:

> On 11-05-30 09:15 PM, Me (Gmail) wrote:
>
>> I've been working on improving the Barrie, Ontario area, and I'm
>> trying to figure out what is going on with/what to do about Lake
>> Simcoe.
>>
>> There are multiple CanVec-imported ways that together make up a fairly
>> detailed, accurate representation of the lake. A single low-detail way
>> [1] is overlapping these, and obscures the accurate detail in many
>> places when rendered [2].
>>
>> [1]: http://www.openstreetmap.org/browse/way/4997263
>> [2]: http://dl.dropbox.com/u/2398828/lake-simcoe-josm.png
>>
>> Not having much experience dealing with large or tiled objects in OSM,
>> my question is if the low-resolution object is serving a purpose, and
>> whether I should bother editing it so as to not overlap with the
>> high-detail version, or whether it can just be deleted.
>>
>>  Hi AJ,
>
> The Canvec version is clearly better, so the lowres version can be deleted.
> It was probably one of the features being traced when only Landsat imagery
> was available. In my opinion this cleaning up should have been done during
> the import of the Canvec sheet. Otherwise this import gets more
> characteristics of a "bad import" (by leaving duplicate features), which we
> should prevent. (Note that there are also some people who think that user
> traced features are always better than imported features, but in this case
> the difference is evident, and nobody has bothered yet to trace the
> shoreline from the Bing imagery.)
>
> What might have caused this is that Lake Simcoe overlaps several sheets, so
> it can't be deleted at once. Wat I usually do is to cut the part of the
> coastline which is overlapping the sheet being imported, and connect the
> existing coastline to the new one. An example of this can be seen in the
> southeast part of Lac Saint-Jean in Québec: [1]. This is also how I've dealt
> with the Saguenay river, and also with the St. Lawrence coastline. This can
> best be done asap, because you never know for sure when you continue with
> the rest. It is a bit more work, but in my opinion it's much better than
> confusing or even annoying others.
>
> Frank
>
> [1] http://osm.org/go/cLD8wZR--
>
>
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