[talk-ph] Provincial relations ( no not your far away relatives :-) )

maning sambale emmanuel.sambale at gmail.com
Mon Mar 28 10:44:43 BST 2011


Dear Ian,

I personally appreciate your province relations effort as I am
currently testing a new algorithm for garmin map that utilizes
boundary relations to assign address info to streets.  Getting the
correct admin boundaries for towns/cities is the holy grail of geodata
and your work is great start.

On Mon, Mar 28, 2011 at 5:33 PM, Ian Haylock <haylocki at yahoo.co.uk> wrote:
> Hi,
>
> Well anyone who wishes can reverse the changeset where I moved the boundary. It bothers me not :-)
>
> Am I the only one who can see the similarity between the shape of the border and the shape of the river ?
>
> Still unless we get a good source of municipal boundaries, I'm finished with boundaries now. Back to error fixing and tracing images.
>
> Oh, maybe I'll check the boundaries in Manila that I haven't checked yet, but I need a break from boundaries for a while.
>
> Cheers, Ian
>
>
> --- On Mon, 28/3/11, maning sambale <emmanuel.sambale at gmail.com> wrote:
>
>> From: maning sambale <emmanuel.sambale at gmail.com>
>> Subject: Re: [talk-ph] Provincial relations ( no not your far away relatives :-) )
>> To: "Eugene Alvin Villar" <seav80 at gmail.com>
>> Cc: "Ian Haylock" <haylocki at yahoo.co.uk>, "OpenStreetMap Philippines" <talk-ph at openstreetmap.org>
>> Date: Monday, 28 March, 2011, 5:36
>> Unless we have very good reference,
>> using rivers as boundaries is not
>> always a good choice.  The post-ondoy imagery from
>> Bing shows that a
>> lot of river tributaries have changed already:
>> http://www.openstreetmap.org/user/maning/diary/13191
>>
>> On Sun, Mar 27, 2011 at 11:35 PM, Eugene Alvin Villar
>> <seav80 at gmail.com>
>> wrote:
>> >>> 4. When you moved the QC-Rizal boundary to
>> Marikina River
>> >>> (which I'm
>> >>> not sure is really correct)
>> >>
>> >> Well it seemed more logical, as lots of the
>> boundaries seem to follow rivers and streams.
>> >
>> > While it seems logical, it's not always the case. Many
>> boundaries
>> > don't follow any natural feature. Quezon City's map
>> > <http://www.quezoncity.gov.ph/index.php?option=com_content&view=article&id=141&Itemid=16>
>> > suggests that the boundary in that area is a straight
>> line and not the
>> > Marikina River. This map of neighboring San Mateo
>> > ,http://www.batangsanmateo.com/map/index.htm> also
>> suggests that the
>> > boundary is a straight line.
>>
>>
>>
>> --
>> cheers,
>> maning
>> ------------------------------------------------------
>> "Freedom is still the most radical idea of all" -N.Branden
>> wiki: http://esambale.wikispaces.com/
>> blog: http://epsg4253.wordpress.com/
>> ------------------------------------------------------
>>
>



-- 
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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