Re: [talk-ph] Admin Boundary and Coastline
There's no real need. The idea is that in the future we would be able to map out the exact municipal and provincial waters. But until then, making the admin boundaries just tackle land for the moment is manageable since data is much more readily available. Please reply if you have other suggestions. :) On Thu, May 19, 2011 at 8:23 PM, Marloue Pidor mur...@mail2engineer.com wrote: Is there a need to clamp the admin boundaries to the coastline? ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Admin Boundary and Coastline
Hi Eugene, I find it easier if the Barangay boundaries be extendend to the City/Municipal boundary, City/Municipal boundary be extended to the Provincial boundary, Provincial boundary to the Country boundary. This is just a suggestion for the coastal areas as you said to map out the exact municipal and provincial waters. If you notice here, http://osm.org/go/4sY75GPk-- the admin boundaries are clamped to the shoreline and creating the same to the island when we can include those island to the municipal boundary. I'm suggesting this because on a GIS point of view, it is easier to look for places when it is placed inside boundaries. murlwe -Original Message- From: Eugene Alvin Villar [sea...@gmail.com] Sent: 5/19/2011 10:13:33 PM To: mur...@mail2engineer.com Cc: Subject: Re: [talk-ph] Admin Boundary and Coastline There's no real need. The idea is that in the future we would be able to map out the exact municipal and provincial waters. But until then, making the admin boundaries just tackle land for the moment is manageable since data is much more readily available. Please reply if you have other suggestions. :) On Thu, May 19, 2011 at 8:23 PM, Marloue Pidor mur...@mail2engineer.com wrote: Is there a need to clamp the admin boundaries to the coastline? . span id=m2wTlpfont face=Arial, Helvetica, sans-serif size=2 style=font-size:13.5px___BRGet the Free email that has everyone talking at a href=http://www.mail2world.com target=newhttp://www.mail2world.com/abr font color=#99Unlimited Email Storage #150; POP3 #150; Calendar #150; SMS #150; Translator #150; Much More!/font/font/span___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Admin Boundary and Coastline
On Fri, May 20, 2011 at 11:50 AM, Eugene Alvin Villar sea...@gmail.com wrote: Hi Murlwe, I don't think that municipal/provincial waters should be clamped to the national waters. According to the UNCLOS, national waters are those that are within 12 nautical miles (about 22km) from the coastline. According to the Philippine Fisheries Code of 1998, municipal waters are within 15 kilometers of the coastline. In addition, there is yet no rule on how to deal with overlapping municipal waters. According to the Fisheries Code: Where two (2) municipalities are so situated on opposite shores that there is less than thirty (30) kilometers of marine waters between them, the third line shall be equally distant from the opposite shore of the respective municipalities. This can be easily done with a GIS buffer operation, but I don't find any real need for osm to do that. You can of course download the osm data and create your preferred boundary within a GIS app. I couldn't find a law stating anything about provincial waters, but I assume they encompass their municipalities' waters. Same with barangay waters. So the idea is to mark admin boundaries of barangays, municipalities/cities and provinces as just the land portions for now. This includes islands. This is a touchy issue (politically), so for now, I agree with using coastlines as part of the admin boundary. Plus, it is easier to maintain the data since when we move the the coastline, the admin boundary in relation to the coastline move as well. Although I have different opinion with clamping boundary relations to rivers. If the concern is that you want to signify that places/landmarks of an LGU are within its boundaries in GIS terms, then the GIS app need to support boundaries that are composed of multiple polygons. For example, Caloocan City is composed of 2 disjoint territories http://www.openstreetmap.org/?relation=273242. To say that a street or POI is within Caloocan, the GIS app needs to support multiple polygons. I think postgis can do this. Same thing goes currently with LGUs that have islands. The admin boundaries currently include islands as multipolygons. For example, Romblon, whose boundaries are currently clamped to the coastlines of all of its constituent islands: http://www.openstreetmap.org/?relation=1506343. Eugene On Fri, May 20, 2011 at 10:27 AM, Marloue Pidor mur...@mail2engineer.com wrote: Hi Eugene, I find it easier if the Barangay boundaries be extendend to the City/Municipal boundary, City/Municipal boundary be extended to the Provincial boundary, Provincial boundary to the Country boundary. This is just a suggestion for the coastal areas as you said to map out the exact municipal and provincial waters. If you notice here, http://osm.org/go/4sY75GPk-- the admin boundaries are clamped to the shoreline and creating the same to the island when we can include those island to the municipal boundary. I'm suggesting this because on a GIS point of view, it is easier to look for places when it is placed inside boundaries. murlwe -Original Message- From: Eugene Alvin Villar [sea...@gmail.com] Sent: 5/19/2011 10:13:33 PM To: mur...@mail2engineer.com Cc: Subject: Re: [talk-ph] Admin Boundary and Coastline There's no real need. The idea is that in the future we would be able to map out the exact municipal and provincial waters. But until then, making the admin boundaries just tackle land for the moment is manageable since data is much more readily available. Please reply if you have other suggestions. :) On Thu, May 19, 2011 at 8:23 PM, Marloue Pidor mur...@mail2engineer.com wrote: Is there a need to clamp the admin boundaries to the coastline? . ___ Get the Free email that has everyone talking at http://www.mail2world.com Unlimited Email Storage – POP3 – Calendar – SMS – Translator – Much More! -- http://vaes9.codedgraphic.com ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Admin Boundary and Coastline
On Fri, May 20, 2011 at 12:15 PM, maning sambale emmanuel.samb...@gmail.com wrote: On Fri, May 20, 2011 at 11:50 AM, Eugene Alvin Villar sea...@gmail.com wrote: Hi Murlwe, I don't think that municipal/provincial waters should be clamped to the national waters. According to the UNCLOS, national waters are those that are within 12 nautical miles (about 22km) from the coastline. According to the Philippine Fisheries Code of 1998, municipal waters are within 15 kilometers of the coastline. In addition, there is yet no rule on how to deal with overlapping municipal waters. According to the Fisheries Code: Where two (2) municipalities are so situated on opposite shores that there is less than thirty (30) kilometers of marine waters between them, the third line shall be equally distant from the opposite shore of the respective municipalities. Let me clarify, there's a problem with the Fisheries Code's conflict resolution in that it disadvantages municipalities that have offshore islands. This research paper provides a very nice detailed description of the problem including illustrations and examples:http://www.scribd.com/doc/4938593/Archipelagic-Principle-Towards-Charting-of-the-Municipal-Waters ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Admin Boundary and Coastline
Maning, we have the need to do that at least in Davao because we have this Disaster Preparedness project here and it includes monitoring of passenger sea vessels via GPS/SMS?RF going from Davao to Samal so I need the boundaries. We are using OSM as the base map. That is also the reason why I am adding now the Barangay boundaries to have some idea to where the vessel on the map. Eugene, that information help me a lot so now I would limit the barangay boundary to 22kms or 30kms from the shoreline. Thanks for the info guys. murlwe -Original Message- From: maning sambale [emmanuel.samb...@gmail.com] Sent: 5/20/2011 12:15:48 PM To: Cc: mur...@mail2engineer.com; Subject: Re: [talk-ph] Admin Boundary and Coastline On Fri, May 20, 2011 at 11:50 AM, Eugene Alvin Villar sea...@gmail.com wrote: Hi Murlwe, I don't think that municipal/provincial waters should be clamped to the national waters. According to the UNCLOS, national waters are those that are within 12 nautical miles (about 22km) from the coastline. According to the Philippine Fisheries Code of 1998, municipal waters are within 15 kilometers of the coastline. In addition, there is yet no rule on how to deal with overlapping municipal waters. According to the Fisheries Code: Where two (2) municipalities are so situated on opposite shores that there is less than thirty (30) kilometers of marine waters between them, the third line shall be equally distant from the opposite shore of the respective municipalities. This can be easily done with a GIS buffer operation, but I don't find any real need for osm to do that. You can of course download the osm data and create your preferred boundary within a GIS app. I couldn't find a law stating anything about provincial waters, but I assume they encompass their municipalities' waters. Same with barangay waters. So the idea is to mark admin boundaries of barangays, municipalities/cities and provinces as just the land portions for now. This includes islands. This is a touchy issue (politically), so for now, I agree with using coastlines as part of the admin boundary. Plus, it is easier to maintain the data since when we move the the coastline, the admin boundary in relation to the coastline move as well. Although I have different opinion with clamping boundary relations to rivers. If the concern is that you want to signify that places/landmarks of an LGU are within its boundaries in GIS terms, then the GIS app need to support boundaries that are composed of multiple polygons. For example, Caloocan City is composed of 2 disjoint territories http://www.openstreetmap.org/?relation=273242. To say that a street or POI is within Caloocan, the GIS app needs to support multiple polygons. I think postgis can do this. Same thing goes currently with LGUs that have islands. The admin boundaries currently include islands as multipolygons. For example, Romblon, whose boundaries are currently clamped to the coastlines of all of its constituent islands: http://www.openstreetmap.org/?relation=1506343. Eugene On Fri, May 20, 2011 at 10:27 AM, Marloue Pidor mur...@mail2engineer.com wrote: Hi Eugene, I find it easier if the Barangay boundaries be extendend to the City/Municipal boundary, City/Municipal boundary be extended to the Provincial boundary, Provincial boundary to the Country boundary. This is just a suggestion for the coastal areas as you said to map out the exact municipal and provincial waters. If you notice here, http://osm.org/go/4sY75GPk-- the admin boundaries are clamped to the shoreline and creating the same to the island when we can include those island to the municipal boundary. I'm suggesting this because on a GIS point of view, it is easier to look for places when it is placed inside boundaries. murlwe -Original Message- From: Eugene Alvin Villar [sea...@gmail.com] Sent: 5/19/2011 10:13:33 PM To: mur...@mail2engineer.com Cc: Subject: Re: [talk-ph] Admin Boundary and Coastline There's no real need. The idea is that in the future we would be able to map out the exact municipal and provincial waters. But until then, making the admin boundaries just tackle land for the moment is manageable since data is much more readily available. Please reply if you have other suggestions. :) On Thu, May 19, 2011 at 8:23 PM, Marloue Pidor mur...@mail2engineer.com wrote: Is there a need to clamp the admin boundaries to the coastline? . ___ Get the Free email that has everyone talking at http://www.mail2world.com Unlimited Email Storage - POP3 - Calendar - SMS - Translator - Much More! -- http://vaes9.codedgraphic.com ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph -- cheers, maning -- Freedom is still the most radical idea
