[talk-ph] better ways to coordinate coastline mapping?

Ed Garcia eppgarcia at gmail.com
Tue Jul 6 02:20:00 BST 2010


Wow! amazing ... how do you detect "sawtoothness"?  can you teach this at
the skillshare?  OSM genius ka talaga!

Anyway, I take note of the sawtooth patterns between Lucena and Pagbilao
Quezon ... I have corrected this already but the sawtooth appears only on
higher zoom-out levels now.  Does this mean it is good as "done" now?  It
still appears on yoursawtooth_coastlines map though.

ed

On Tue, Jul 6, 2010 at 1:04 AM, Eugene Alvin Villar <seav80 at gmail.com>wrote:

> HI guys,
>
> Here's an *initial* webmap showing where the jagged coastlines are as of
> July 3:
> http://forge.codedgraphic.com/osm/sawtooth_coastlines/
>
> The larger the circle, the more jagged steps there are to clean up.
>
> Sorry, there's no link going to Potlatch or JOSM/Merkaartor. I'll add that
> up when I learn more of OpenLayers. But for now, this will have to do.
>
> Enjoy!
>
> Eugene
>
>
> On Mon, Jul 5, 2010 at 9:30 AM, maning sambale <emmanuel.sambale at gmail.com
> > wrote:
>
>> We missed the June target to to finish the 10 largest islands.
>>
>> http://wiki.openstreetmap.org/wiki/WikiProject_Philippines/Coastline_Corrections#Priorities
>>
>> That's OK.  All we need is to finish mainland Mindanao and we can set
>> our radar to the next 20 on the list.
>> We are also working on some webmap to visualize the "sawtooth".  More
>> on that when its ready.
>>
>>
>> On Sun, Jul 4, 2010 at 5:48 PM, maning sambale
>> <emmanuel.sambale at gmail.com> wrote:
>> > I can load it in my public dropbox.
>> >
>> > On Sun, Jul 4, 2010 at 2:23 PM, Eugene Alvin Villar <seav80 at gmail.com>
>> wrote:
>> >> Hi guys,
>> >>
>> >> Once we are done with the large islands, the next step is to do the
>> smaller
>> >> islands. Ian Haylock has helpfully provided the PGS coastlines[1] for
>> the
>> >> Philippines last year[2] which he edited to combine ways. PGS itself
>> was
>> >> automatically generated by a software by analyzing the Landsat imagery.
>> >> Unfortunately, Ian's file was hosted on a free file server and has now
>> >> expired but I think several people on the mailing list managed to
>> download
>> >> it.
>> >>
>> >> I tried opening the file last year in Merkaartor but my old laptop
>> couldn't
>> >> handle the data. Now that I have a 4GB-RAM laptop, loading the data
>> into
>> >> Merkaartor is very manageable. Using the PGS coastlines is much, much
>> easier
>> >> than tracing Landsat by hand. I tried this with Homonhon Island and
>> editing
>> >> is way faster than actually uploading it[3]. Hehehe. What I did was to
>> >> delete the SRTM-derived coastline[4] and replace it with the PGS
>> >> coastline[5].
>> >>
>> >> I think uploading the PGS coastlines is better for the smaller islands.
>> I'll
>> >> see what we can do to have the PGS coastlines (55MB) uploaded
>> somewhere.
>> >>
>> >> [1] http://wiki.openstreetmap.org/wiki/Prototype_Global_Shoreline
>> >> [2]
>> http://lists.openstreetmap.org/pipermail/talk-ph/2009-June/001071.html
>> >> [3] http://www.openstreetmap.org/browse/changeset/5129873
>> >> [4] http://www.openstreetmap.org/browse/way/4327906
>> >> [5] http://www.openstreetmap.org/browse/way/65592780
>> >>
>> >> Eugene
>> >>
>> >>
>> >> On Thu, Jun 17, 2010 at 8:20 PM, maning sambale <
>> emmanuel.sambale at gmail.com>
>> >> wrote:
>> >>>
>> >>> UPDATE. Only two islands from the top ten need some coasty coastline
>> love.
>> >>>
>> >>>
>> http://wiki.openstreetmap.org/wiki/WikiProject_Philippines/Coastline_Corrections
>> >>>
>> >>> Anyone working on Negros and Mainland Mindanao?
>> >>>
>> >>
>> >>
>> >
>> >
>> >
>> > --
>> > 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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>>
>
>
>
> --
> http://vaes9.codedgraphic.com
>
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