[Talk-ca] Great Lakes shoreline
Hello, I have been adding canvec data for the last part of the Bruce Peninsula and noticed that the existing shoreline is quite different than that given by the canvec data. The source for the existing coastline is r_coastlines and I have no idea who/what that is. I don't know which is more accurate but the canvec coastline matches much better with the land features. Should the existing coastline be left alone or should it be switched over? -- James (Jay) Treacy tre...@debian.org ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Great Lakes shoreline
On Wed, Apr 20, 2011 at 12:29 PM, James A. Treacy tre...@debian.org wrote: Hello, I have been adding canvec data for the last part of the Bruce Peninsula and noticed that the existing shoreline is quite different than that given by the canvec data. The source for the existing coastline is r_coastlines and I have no idea who/what that is. I don't know which is more accurate but the canvec coastline matches much better with the land features. Should the existing coastline be left alone or should it be switched over? Dear Jay, That's the eternal question isn't it? With one source, we just use it. With multiple sources; it's always about evaluation and comparison. ;-) r_coastlines doesn't ring a bell, but I know that PGS coastlines was fairly easy to improve upon. Sounds like you are seeing canvec as a better match to the other land features, which may also be from canvec. I'm not sure you should see that as definitive. But if the canvec is a better match, and yahoo / Bing don't disagree, ... ? If you decide to proceed, and the water bodies are tagged as coastline, be aware that coastline rendering is sensitive, and does not re-render immediately. ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Great Lakes shoreline
My suggestion on the coastline. Connect both the canvec and existing together at some point. Leave it for a few days. Then delete the old one. That way there's always a connected coastline. Especially if the coastline is one of the great lakes. It also handles the case I ran into. I finished a project and moved on, then someone wiped out part of my changes with an update (they grabbed data days before my updates) this created a disconnected coastline. Michael On Wed, Apr 20, 2011 at 12:29 PM, James A. Treacy tre...@debian.org wrote: Hello, I have been adding canvec data for the last part of the Bruce Peninsula and noticed that the existing shoreline is quite different than that given by the canvec data. The source for the existing coastline is r_coastlines and I have no idea who/what that is. I don't know which is more accurate but the canvec coastline matches much better with the land features. Should the existing coastline be left alone or should it be switched over? -- James (Jay) Treacy tre...@debian.org ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca -- * G. Michael Carter* Contact: H: 1-519-940-8935 | W: 1-905-267-8494 | M: 1-519-215-1869 | F: 1-519-941-0009 Google Talk: xmpp:mikeycarter1...@gmail.com http://livedvd.carterfamily.ca/http://www.openstreetmap.org/?lat=43.9216lon=-80.105zoom=14layers=B000FTF http://www.openstreetmap.org/?lat=43.9216lon=-80.105zoom=14layers=B000FTF ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Great Lakes shoreline
On Wed, Apr 20, 2011 at 01:58:39PM -0400, Richard Weait wrote: On Wed, Apr 20, 2011 at 12:29 PM, James A. Treacy tre...@debian.org wrote: Hello, I have been adding canvec data for the last part of the Bruce Peninsula and noticed that the existing shoreline is quite different than that given by the canvec data. The source for the existing coastline is r_coastlines and I have no idea who/what that is. I don't know which is more accurate but the canvec coastline matches much better with the land features. Should the existing coastline be left alone or should it be switched over? Dear Jay, That's the eternal question isn't it? With one source, we just use it. With multiple sources; it's always about evaluation and comparison. ;-) r_coastlines doesn't ring a bell, but I know that PGS coastlines was fairly easy to improve upon. Sounds like you are seeing canvec as a better match to the other land features, which may also be from canvec. I'm not sure you should see that as definitive. But if the canvec is a better match, and yahoo / Bing don't disagree, ... ? I just did a comparison with Bing imagery and there is no comparison: even given the low resolution of the imagery, the canvec coastline for the tip of the Bruce Peninsula is clearly 10x better. Of course, that is no indication that the rest of the coastline for Lake Huron is as good so would check it as I go along. If you decide to proceed, and the water bodies are tagged as coastline, be aware that coastline rendering is sensitive, and does not re-render immediately. Due to time constraints, I wouldn't start this until May. In fact I will have spotty (at best) net connection next week. That is probably a good idea as it will give time for feedback from others. I'd want to start with a test section and see how it goes before proceeding. Do you know how long it is between updates of coastlines? Also, if it goes well I would just proceed and update a large section of the coast. As this would involve a large geographical area, I would give updates to the mailing list to minimize the chance of conflicts. -- James (Jay) Treacy tre...@debian.org ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Great Lakes shoreline
Coastline updates vary, depending on Mapnik vs. Osmarender and what zoom level you're looking at. I've done editing to the coastline that represents Great Slave Lake in the Northwest Territories, and edits made on April 2 still have not been rendered by Mapnik, but they have been rendered by Osmarender. Edits made on March 15 are rendered (and have been for a week or two). So right now it takes around a month for coastline changes to be rendered by Mapnik. Adam On Wed, Apr 20, 2011 at 11:44 AM, James A. Treacy tre...@debian.org wrote: On Wed, Apr 20, 2011 at 01:58:39PM -0400, Richard Weait wrote: On Wed, Apr 20, 2011 at 12:29 PM, James A. Treacy tre...@debian.org wrote: Hello, I have been adding canvec data for the last part of the Bruce Peninsula and noticed that the existing shoreline is quite different than that given by the canvec data. The source for the existing coastline is r_coastlines and I have no idea who/what that is. I don't know which is more accurate but the canvec coastline matches much better with the land features. Should the existing coastline be left alone or should it be switched over? Dear Jay, That's the eternal question isn't it? With one source, we just use it. With multiple sources; it's always about evaluation and comparison. ;-) r_coastlines doesn't ring a bell, but I know that PGS coastlines was fairly easy to improve upon. Sounds like you are seeing canvec as a better match to the other land features, which may also be from canvec. I'm not sure you should see that as definitive. But if the canvec is a better match, and yahoo / Bing don't disagree, ... ? I just did a comparison with Bing imagery and there is no comparison: even given the low resolution of the imagery, the canvec coastline for the tip of the Bruce Peninsula is clearly 10x better. Of course, that is no indication that the rest of the coastline for Lake Huron is as good so would check it as I go along. If you decide to proceed, and the water bodies are tagged as coastline, be aware that coastline rendering is sensitive, and does not re-render immediately. Due to time constraints, I wouldn't start this until May. In fact I will have spotty (at best) net connection next week. That is probably a good idea as it will give time for feedback from others. I'd want to start with a test section and see how it goes before proceeding. Do you know how long it is between updates of coastlines? Also, if it goes well I would just proceed and update a large section of the coast. As this would involve a large geographical area, I would give updates to the mailing list to minimize the chance of conflicts. -- James (Jay) Treacy tre...@debian.org ___ 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
