[Talk-ca] Map Error

[Sam Vekemans]

Cool, thanks :)
I suspect that the data is also more current.
I dout that better data is available, untill you get to the municipal level.
I like the geobase data, primarly because it is in water basins.
But i think quality is more important than ease of use.
Do i need to make the shp files available?
I'm thinking of posting the data to geocommons.org.



cheers,
sam

On 10/25/10, Bob Dustan <bob.dustan at gmail.com> wrote:
> Hi Sam,
>
> I just updated the affected area using LIO WMS to trace from.
> Incidentally, LIO matches up with Google imagery fairly well.
>
> Bob
>
>
> On 10/25/2010 12:40 AM, Sam Vekemans wrote:
>> Hi,
>> Yes.  Thats most likely correct.  This happens across the country
>> along the NTS border lines.
>> You might want to check the GeoBaseNHN data, as it could be better.
>> (since its organized in water basins)[1]
>>
>> Then we can go 1 level deeper, into the Land Information Ontario
>> dataset.   A WMS layer is available [2] as well as the source shp
>> files.  (I do have direct access to it (via a data warehouse loginID)
>>
>> [1]
>> wms layer for JOSM  (found on this page
>> http://wiki.openstreetmap.org/wiki/Geobase/NHN_-_OSM_Map_Feature)
>> http://wms.cits.rncan.gc.ca/cgi/wms_en.cgi?map=/export/wms/mapfiles/rhn/geobase_rhn.map&version=1.1.1&service=WMS&request=Getmap&layer=HYDRO_AGGREGAT&format=image/png&STYLE=default&layers=GEOBASE_RHN_NHN&
>>
>> [2]
>> http://wiki.openstreetmap.org/wiki/Land_Information_Ontario#Data_Access_-_WMS_Layers
>> You'll have to dig... i'm not exactly sure where the river WMS is..
>> but i do remember seeing it.  The Ontario servers are considerably
>> slower than NRCan, so you'll need to be patient :)
>>
>> You might want to try using  Merkaartor, as it can handle WMS layers
>> alot better.
>> http://wiki.openstreetmap.org/wiki/Merkaartor
>>
>> Cheers,
>> Sam
>>
>> P.S.   great to hear from another Ibycus Topo user :)   One of my
>> projects is to make a better version of it, now that more data is
>> available.   I don't know if Dale Atkin is planning on doing the same
>> at some point.
>>
>>
>> ---
>> Across Canada Trails - Beyond 2017 - The National Trails Network
>> Victoria, BC Canada
>>
>> Twitter: @Acrosscanada
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>> room)
>>
>>
>>
>> On Sun, Oct 24, 2010 at 2:16 PM, Gordon Dewis <gordon at pinetree.org> wrote:
>>> Interesting. I wonder if it's an artefact left over after the
>>> NAD27->NAD83 conversion.
>>>
>>>  --Gordon
>>> -----Original Message-----
>>> From: Bob Dustan <bob.dustan at gmail.com>
>>> Sender: talk-ca-bounces at openstreetmap.org
>>> Date: Sun, 24 Oct 2010 14:30:45
>>> To: talk-ca<talk-ca at openstreetmap.org>
>>> Subject: [Talk-ca] Map Error
>>>
>>> Hi,
>>>
>>> I was importing CanVec data for 031E07 and noticed what appears to be an
>>> error in the map.  A section of the Oxtongue River seems to be repeated
>>> nearby in 031E06.  In OSM you can see it at:
>>>
>>> http://www.openstreetmap.org/?mlat=45.317&mlon=-79.0&zoom=15&layers=M
>>>
>>> If you use JOSM or Merkaator to view this area and enable the NRCan WMS,
>>> you'll see that the error is also in the WMS version of the map.
>>>
>>> The error also appears in "The Atlas of Canada" (Toporama) web site at:
>>>
>>> http://atlas.nrcan.gc.ca/site/english/maps/topo/map?layers=nodata_ntdb_50k%20north_arrow%20other_features%20million_grid%20t50k_grid%20grid_50k_3%20roads%20hydrography%20boundary%20builtup%20vegetation%20populated_places%20railway%20power_network%20manmade_features%20designated_areas%20water_features%20water_saturated_soils%20relief%20contours%20toponymy%20contour&scale=1400000.000000&mapxy=1281552.5697346777%20-273673.4692181579&map_layer[northarrow]_class[0]_style[0]=ANGLE%20-14.587661326428645&mapsize=750%20666&urlappend=
>>>
>>> The error also appears in the Ibycus map.
>>>
>>> Also, if you look north along the boundary between these 2 map sections,
>>> you will see other discrepancies.
>>>
>>> I have topo maps of the area that I bought at least 10 years ago.  They
>>> appear to be scans of paper maps.  When I line up the 2 map sections,
>>> everything lines up (roads, rivers, elevation lines, etc.).
>>>
>>> It seems to me that some errors (albeit fairly minor) were introduced in
>>> the digital form of the map.  Then the errors were propagated to CanVec.
>>>
>>> Is there a way to get the map corrected?
>>>
>>> Bob
>>>
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>


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