[talk-ph] editing admin boundaries of Marikina

[maning sambale]

What I did was,

1.  Create a boundary for each barangay, example is:
http://www.openstreetmap.org/browse/way/35024135

admin_level = 10
boundary = administrative
name = Marikina Heights

pros, easier to create; cons, there will be overlapping ways.

2.  Add a relation for city
http://www.openstreetmap.org/browse/relation/146949

admin_level = 6
boundary = administrative
name = Marikina
type = multipolygon

pros, it adds the whole boundaries of barangays not only the outer
limits but also the inner boundaries.

In short a way/polygon for the highest admin_level (in this case,
level=10) and relations and relation of a relations for lower
admin_level.
I see the advantage of using purely relations up to the barangay
level.  I'll try it with my succeeding edits.

Nice ascii art, btw.

On Tue, May 26, 2009 at 10:12 PM, Eugene Alvin Villar <seav80 at gmail.com> wrote:
> Hi maning,
>
> What we and Ian do is to decompose the borders as a network of ways. Each
> boundary way should only be a dividing line between any two barangays (if
> known) and left unnamed and tagged with the lowest (numeric) possible
> admin_level. Then the borders surrounding a barangay are collected into a
> relation as are the ways surrounding a municipality, city, province, etc.
>
> Example: City A is composed of barangays W, X, Y and Z.
>
>    ,--------,--------,
>    |    2   |    4   |
>    |1  W    |3       |
>    |        |   X   5|
>    |--------|        |
>    |   8   7|    6   |
>    |        |--------|
>    |9  Y    |        |
>    |        |11  Z 12|
>    |  10    |   13   |
>    '--------'--------'
>
> Hopefully the ASCII art looks ok. In this example, we have a total of 13
> ways all tagged with boundary=administrative. In addition, ways 1, 2, 4, 5,
> 12, 13, 10, and 9 are tagged with admin_level=6 (city) while the rest with
> admin_level=10 (barangay).
>
> Then create relations for each of the barangays:
>
> Barangay W:
> type=boundary
> boundary=administrative
> admin_level=10
> name=W
> members: 1,2,3,8 (all as blank)
>
> and so on.
>
> Then finally, City A is another relation:
> type=boundary
> boundary=administrative
> admin_level=6
> name=A
> members: 1,2,4,5,12,13,10,9 (all as blank)
>
> Hopefully this explains everything.
>
> Eugene / seav
>
>
> On Tue, May 26, 2009 at 6:36 PM, maning sambale <emmanuel.sambale at gmail.com>
> wrote:
>>
>> Hi,
>>
>> I am starting to add admin boundaries of Marikina (partly because I
>> envy Makati!).
>>
>> http://www.openstreetmap.org/?lat=14.6442&lon=121.1174&zoom=14&layers=B000FTF
>>
>> I am now adopting seav's proposal on the admin_levels and using
>> relations for aggregating barangay boundaries into Marikina City
>> borders.
>>
>> The admin boundaries around marikina (QC, pasig, san mateo, cainta and
>> antipolo) maybe a bit messy right now.  Partly because I am trying to
>> understand how to merge marikina barangay boundaries into the existing
>> boundaries (please don't touch them for the moment, I promise to
>> finish this weekend).
>>
>> The hardest part is how to tag multiple boundary levels.
>>
>> for example, the northern border of Barangay Nangka:
>> http://www.openstreetmap.org/browse/way/35024130
>> admin_level = 10
>> boundary = administrative
>> name = Nangka
>>
>> is also the  admin boundary of Marikina and San Mateo
>> admin_level = 6
>>
>> which is also part of the Rizal border
>> admin_level = 4
>>
>> which is also the regional boundary
>> admin_level = 3
>>
>> Whew!
>>
>> When there are conflicts (in the OSM sense), I decided to treat higher
>> admin level (i. e. barangay and municipalities), as a "priority" over
>> other admin levels.
>> Is this good practice?
>>
>>
>>
>> --
>> cheers,
>> maning
>> ------------------------------------------------------
>> "Freedom is still the most radical idea of all" -N.Branden
>> wiki: http://esambale.wikispaces.com/
>> blog: http://epsg4253.wordpress.com/
>> ------------------------------------------------------
>>
>> _______________________________________________
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>
>
>
> --
> http://vaes9.codedgraphic.com
>



-- 
cheers,
maning
------------------------------------------------------
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
------------------------------------------------------