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. 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. 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. 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
