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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.<br>
<br>
Eugene, that information help me a lot so now I would limit the barangay boundary to 22kms or 30kms from the shoreline.<br>
<br>
Thanks for the info guys.<br>
<br>
murlwe<br>
<br>
<br>
<br>
<-----Original Message-----> <br>
From: maning sambale [emmanuel.sambale@gmail.com]<br>
>Sent: 5/20/2011 12:15:48 PM<br>
>To: <br>
>Cc: murlwe@mail2engineer.com;<br>
>Subject: Re: [talk-ph] Admin Boundary and Coastline<br>
><br>
>On Fri, May 20, 2011 at 11:50 AM, Eugene Alvin Villar <seav80@gmail.com> <br>
>wrote:<br>
>> Hi Murlwe,<br>
>><br>
>> I don't think that municipal/provincial waters should be clamped to<br>
>> the national waters.<br>
>><br>
>> According to the UNCLOS, national waters are those that are within 12<br>
>> nautical miles (about 22km) from the coastline. According to the<br>
>> Philippine Fisheries Code of 1998, municipal waters are within 15<br>
>> kilometers of the coastline. In addition, there is yet no rule on how<br>
>> to deal with overlapping municipal waters.<br>
><br>
>According to the Fisheries Code:<br>
>Where two (2) municipalities are so situated on opposite shores that<br>
>there is less than thirty (30) kilometers of marine waters between<br>
>them, the third line shall be equally distant from the opposite shore<br>
>of the respective municipalities.<br>
><br>
>This can be easily done with a GIS buffer operation, but I don't find<br>
>any real need for osm to do that. You can of course download the osm<br>
>data and create your preferred boundary within a GIS app.<br>
><br>
>> I couldn't find a law stating anything about provincial waters, but I<br>
>> assume they encompass their municipalities' waters. Same with barangay<br>
>> waters.<br>
>><br>
>> So the idea is to mark admin boundaries of barangays,<br>
>> municipalities/cities and provinces as just the land portions for now.<br>
>> This includes islands.<br>
>This is a touchy issue (politically), so for now, I agree with using<br>
>coastlines as part of the admin boundary. Plus, it is easier to<br>
>maintain the data since when we move the the coastline, the admin<br>
>boundary in relation to the coastline move as well.<br>
><br>
>Although I have different opinion with "clamping" boundary relations to rivers.<br>
><br>
><br>
>> If the concern is that you want to signify that places/landmarks of an<br>
>> LGU are within its boundaries in GIS terms, then the GIS app need to<br>
>> support boundaries that are composed of multiple polygons. For<br>
>> example, Caloocan City is composed of 2 disjoint territories<br>
>> <http://www.openstreetmap.org/?relation=273242>. To say that a street<br>
>> or POI is within Caloocan, the GIS app needs to support multiple<br>
>> polygons.<br>
><br>
>I think postgis can do this.<br>
><br>
>> Same thing goes currently with LGUs that have islands. The admin<br>
>> boundaries currently include islands as multipolygons. For example,<br>
>> Romblon, whose boundaries are currently clamped to the coastlines of<br>
>> all of its constituent islands:<br>
>> <http://www.openstreetmap.org/?relation=1506343>.<br>
>><br>
>><br>
>> Eugene<br>
>><br>
>> On Fri, May 20, 2011 at 10:27 AM, Marloue Pidor<br>
>> <murlwe@mail2engineer.com> wrote:<br>
>>> Hi Eugene, I find it easier if the Barangay boundaries be extendend to <br>
>the<br>
>>> City/Municipal boundary, City/Municipal boundary be extended to the<br>
>>> Provincial boundary, Provincial boundary to the Country boundary. This is<br>
>>> just a suggestion for the coastal areas as you said to map out the exact<br>
>>> municipal and provincial waters. If you notice here,<br>
>>> http://osm.org/go/4sY75GPk-- the admin boundaries are clamped to the<br>
>>> shoreline and creating the same to the island when we can include those<br>
>>> island to the municipal boundary. I'm suggesting this because on a GIS <br>
>point<br>
>>> of view, it is easier to look for places when it is placed inside<br>
>>> boundaries.<br>
>>><br>
>>> murlwe<br>
>>><br>
>>><br>
>>> <-----Original Message-----><br>
>>> From: Eugene Alvin Villar [seav80@gmail.com]<br>
>>>>Sent: 5/19/2011 10:13:33 PM<br>
>>>>To: murlwe@mail2engineer.com<br>
>>>>Cc:<br>
>>>>Subject: Re: [talk-ph] Admin Boundary and Coastline<br>
>>>><br>
>>>>There's no real need. The idea is that in the future we would be able<br>
>>>>to map out the exact municipal and provincial waters. But until then,<br>
>>>>making the admin boundaries just tackle land for the moment is<br>
>>>>manageable since data is much more readily available.<br>
>>>><br>
>>>>Please reply if you have other suggestions. :)<br>
>>>><br>
>>>><br>
>>>>On Thu, May 19, 2011 at 8:23 PM, Marloue Pidor <br>
><murlwe@mail2engineer.com><br>
>>>>wrote:<br>
>>>>> Is there a need to clamp the admin boundaries to the coastline?<br>
>>>>.<br>
>>>><br>
>>><br>
>>> _______________________________________________________________<br>
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>><br>
>><br>
>><br>
>> --<br>
>> http://vaes9.codedgraphic.com<br>
>><br>
>> _______________________________________________<br>
>> talk-ph mailing list<br>
>> talk-ph@openstreetmap.org<br>
>> http://lists.openstreetmap.org/listinfo/talk-ph<br>
>><br>
><br>
><br>
><br>
>-- <br>
>cheers,<br>
>maning<br>
>------------------------------------------------------<br>
>"Freedom is still the most radical idea of all" -N.Branden<br>
>wiki: http://esambale.wikispaces.com/<br>
>blog: http://epsg4253.wordpress.com/<br>
>------------------------------------------------------<br>
>.<br>
>
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