[talk-ph] Admin Boundary and Coastline

Eugene Alvin Villar seav80 at gmail.com
Fri May 20 04:50:02 BST 2011

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

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

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:


On Fri, May 20, 2011 at 10:27 AM, Marloue Pidor
<murlwe at 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 [seav80 at gmail.com]
>>Sent: 5/19/2011 10:13:33 PM
>>To: murlwe at mail2engineer.com
>>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 <murlwe at mail2engineer.com>
>>> Is there a need to clamp the admin boundaries to the coastline?
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