Re: [Talk-ca] Fredericton WMS Offset
Nicholas, I have noticed your work adding numerous building footprints in the Fredericton area. It's great to see somebody taking on this large task. It has been my experience that the older Bing imagery was better aligned than the current Bing imagery in the Fredericton area. I have been mapping in the Fredericton area since 2007 and the older Bing imagery aligned nicely with my GPS traces. It is best to align the new Bing Imagery with OSM streets and GPS traces. The misalignment of the Bing imagery varies across the Fredericton area so I would readjust the alignment of the Bing Imagery as you move to new neighborhoods. It is my practice to always adjust the Bing Imagery each time I start a new Potlatch 2 session and readjust when I move to new areas of the Fredericton region. This map I built at arcgis.com may help shed some light on the alignment issue. http://www.arcgis.com/apps/Compare/Configure/index.html?appid=c0f0ca089e23457082e997dceea0061b Cheers, Bernie. -- Bernie Connors, P.Eng bernie.conn...@unb.camailto:bernie.conn...@unb.ca New Maryland, NB From: nicholas ingalls [mailto:nicholas.inga...@gmail.com] Sent: Tuesday, 2013-01-01 19:23 To: talk-ca@openstreetmap.org Subject: [Talk-ca] Fredericton WMS Offset Hello all, I've been recently drawing all of the buildings in Fredericton in preparation for going around and collecting the addresses. I'd noticed that all the buildings in Fredericton were offset. Naturally I assumed that the original mappers in Fredericton had done this offset on purpose. I recently tested this against GPS traces and found that the offset was incorrect based on the traces I collected. I'm now assuming that this data was traced from the old Yahoo imagery and current users continue to offset the Bing WMS to match the data traced from the Yahoo imagery. I am proposing that we shift the data back to match the Bing WMS and the gps traces. Does anyone else from the Fredericton area have any comments, or can explain the offset? Cheers, ingalls ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Fredericton WMS Offset
If you want to check the accuracy of your GPX files in New Brunswick you can drag and drop them on this map I created at ArcGIS.com: http://www.arcgis.com/home/webmap/viewer.html?webmap=71d0cc7deebd4b359a14ea140d63d6f4 As you zoom in the property lines and civic addresses will be added to the air photo map. All of this data is published the government of New Brunswick (aka me and my co-workers). The accuracy of this data should exceed the accuracy of the consumer grade GPS receiver. You can read more about adding GPX files to this map in the ArcGIS.com help pages: http://resources.arcgis.com/en/help/arcgisonline/#/About_CSV_TXT_and_GPX_files/010q008v00/ In the Fredericton we are displaying the 2008 air photos captured by the City of Fredericton. They are not as current as the Bing Imagery in Potlatch but the alignment is excellent. The City of Fredericton acquired new imagery in 2012 and we will be updating this map as soon as we have the time and resources (some time in 2013). Bernie. -- Bernie Connors, P.Eng Land Information Infrastructure Unit, SNB bernie.conn...@snb.ca -Original Message- From: Andrew Buck [mailto:andrew.r.b...@gmail.com] Sent: Wednesday, 2013-01-02 15:59 To: nicholas ingalls Cc: talk-ca@openstreetmap.org Subject: Re: [Talk-ca] Fredericton WMS Offset Hi, I am not from the area, but I did want to post my 2 cents about this issue. Your idea of how the offset got started sounds correct. I would caution you though that GPS traces can be offset, too, due to atmospheric effects. To really get a good trace with no offset you need to do a few traces on different days of the same road (or path is better since it is narrow) and through an area with few buildings around as these can cause offsets, too. Other than those issues, if you trust your traces then I see no reason not to fix the offset, but as I said make sure your traces are good first. -AndrewBuck ___ 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] Canadienne ou américaine, cette île?
Here is my 2 cents worth on the international maritime boundary issue in the Gulf of Maine: · The Canadian Coast Guard has operated navigational aids on Machias Seal Island for a very long time · I heard in the past that a US citizen in Maine holds a deed to Machias Seal Island – but that does not dictate sovereignty – if that were the case Canada would have sovereignty over many condos and vacation homes in Florida ;) · As a GIS manager working in the government of New Brunswick I always showed Machias Seal Island as being part of New Brunswick when I produced maps. · The Province of New Brunswick Included Machias Seal Island in several map products it has produced over the past few decades. Bernie. -- Bernie Connors, P.Eng bernie.conn...@unb.camailto:bernie.conn...@unb.ca New Maryland, NB From: Bruno Remy [mailto:bremy.qc...@gmail.com] Sent: Sunday, 2012-12-23 17:20 To: Harald Kliems Cc: talk-ca@openstreetmap.org Subject: Re: [Talk-ca] Canadienne ou américaine, cette île? Good news : we're up-to-date. Let's stay tuned and follow what both gov. will decide! ;-) Bruno Remy Le 2012-12-23 16:15, Harald Kliems kli...@gmail.commailto:kli...@gmail.com a écrit : I saw the coverage in the Gazette this morning and checked the border. We indeed have border=disputed in the database, and it has been like that for quite some time. Nominatim will return the island twice, one with USA, one with Canada as the country. Harald. On Sun, Dec 23, 2012 at 4:08 PM, Bruno Remy bremy.qc...@gmail.commailto:bremy.qc...@gmail.com wrote: (english message will follow) À suivre de près: La Presse souligne un débat Géopolitique aux frontières du Maine(US) et du Nouveau-Brunswick: Le temps pour nous de vérifier la frontiète administrative ici! -- Please follow this: LaPresse published a geo-politic debate on administrative bondaries beetween Maine(US) and New-Brunswick(CA). Time for us to check out the administrative bondaries around here! http://www.lapresse.ca/le-soleil/actualites/politique/201212/23/01-4606481-canadienne-ou-americaine-cette-ile.php Bruno Remy ___ Talk-ca mailing list Talk-ca@openstreetmap.orgmailto:Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca -- Please use encrypted communication whenever possible! Key-ID: 0x199DC50F ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
