Re: [Talk-ca] Map Error
Hi all, I would agree with Gordon, it looks pretty much like an artifact left over after the NAD27-NAD83 conversion. These artifacts were corrected when the map were digitized but obviously not in this case. Sam, this does not happen across the country along the NTS border lines. You find edge match problems due to differences in time of aerial photography, aerial photography interpretation, and so on, but not the NAD27-NAD83 conversion. About GeoBase NHN data, it should be the same because, as explained before, they all come from the same source. However, the QC team is already having a look and I will get back to you soon. Thanks, Daniel -Original Message- From: talk-ca-boun...@openstreetmap.org [mailto:talk-ca-boun...@openstreetmap.org] On Behalf Of Sam Vekemans Sent: October 25, 2010 00:40 To: gor...@pinetree.org; Bob Dustan Cc: talk-ca Subject: Re: [Talk-ca] Map Error 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.mapversion=1.1.1service=WMSrequest=Getmaplayer=HYDRO_AGGREGATformat=image/pngSTYLE=defaultlayers=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 Blog: http://acrosscanadatrails.posterous.com/ Facebook: http://www.facebook.com/sam.vekemans Skype: 'Sam Vekemans' IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) IRC: irc://irc.oftc.net #CommonMap The Common Map channel (an open chat room) On Sun, Oct 24, 2010 at 2:16 PM, Gordon Dewis gor...@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.dus...@gmail.com Sender: talk-ca-boun...@openstreetmap.org Date: Sun, 24 Oct 2010 14:30:45 To: talk-catalk-ca@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=45.317mlon=-79.0zoom=15layers=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%20popula ted_places%20railway%20power_network%20manmade_features%20designated_a reas%20water_features%20water_saturated_soils%20relief%20contours%20to ponymy%20contourscale=140.00mapxy=1281552.5697346777%20-2736 73.4692181579map_layer[northarrow]_class[0]_style[0]=ANGLE%20-14.5876 61326428645mapsize=750%20666urlappend= 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 ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-ca mailing
Re: [Talk-ca] Map Error
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.mapversion=1.1.1service=WMSrequest=Getmaplayer=HYDRO_AGGREGATformat=image/pngSTYLE=defaultlayers=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 Blog: http://acrosscanadatrails.posterous.com/ Facebook: http://www.facebook.com/sam.vekemans Skype: 'Sam Vekemans' IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) IRC: irc://irc.oftc.net #CommonMap The Common Map channel (an open chat room) On Sun, Oct 24, 2010 at 2:16 PM, Gordon Dewis gor...@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.dus...@gmail.com Sender: talk-ca-boun...@openstreetmap.org Date: Sun, 24 Oct 2010 14:30:45 To: talk-catalk-ca@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=45.317mlon=-79.0zoom=15layers=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%20contourscale=140.00mapxy=1281552.5697346777%20-273673.4692181579map_layer[northarrow]_class[0]_style[0]=ANGLE%20-14.587661326428645mapsize=750%20666urlappend= 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 ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Map Error
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.dus...@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.mapversion=1.1.1service=WMSrequest=Getmaplayer=HYDRO_AGGREGATformat=image/pngSTYLE=defaultlayers=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 Blog: http://acrosscanadatrails.posterous.com/ Facebook: http://www.facebook.com/sam.vekemans Skype: 'Sam Vekemans' IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) IRC: irc://irc.oftc.net #CommonMap The Common Map channel (an open chat room) On Sun, Oct 24, 2010 at 2:16 PM, Gordon Dewis gor...@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.dus...@gmail.com Sender: talk-ca-boun...@openstreetmap.org Date: Sun, 24 Oct 2010 14:30:45 To: talk-catalk-ca@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=45.317mlon=-79.0zoom=15layers=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%20contourscale=140.00mapxy=1281552.5697346777%20-273673.4692181579map_layer[northarrow]_class[0]_style[0]=ANGLE%20-14.587661326428645mapsize=750%20666urlappend= 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 ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca -- Twitter: @Acrosscanada Blogs: http://acrosscanadatrails.posterous.com/ http://Acrosscanadatrails.blogspot.com Facebook: http://www.facebook.com/sam.vekemans Skype: samvekemans IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) @Acrosscanadatrails ___ Talk-ca mailing list
