[talk-ph] Luzon Coastline

Ed Garcia eppgarcia at gmail.com
Fri Feb 20 08:40:26 GMT 2009


I also tried to "trace" that coastline section too a few days ago via JOSM
and was looking for possibility of "unmerged coastline nodes" somewhere.
Found none.

That section that went AWOL could be it.  Can't wait for Wednesday.

Thanks Jim!
:>)

On Fri, Feb 20, 2009 at 4:20 PM, Jim Morgan <jim at datalude.com> wrote:

> I've been trying to figure out the Luzon coastline around Zambales, as its
> driving me nuts. Personally I think it looks terribly offputting to see such
> a glaring error, especially as we're seeing some new members recently.
>
> So I looked at the coastline checker here,
>
> http://tile.openstreetmap.nl/coastlines.html?zoom=9&lat=15.1027&lon=120.35419&layers=B00T
>
> and, using the notes here
>        http://wiki.openstreetmap.org/index.php/Coastline_error_checker
>
> investigated a few of the Big Red Dots.
>
> From looking at them in JOSM, the Big Red Dots seem to be at areas where
> the coastline is split into different sections. The sections have the same
> tags i.e.
>  layer=-1
>  name=Luzon
>  natural=coastline
> and the direction is correct -- wet on the right.
> But they have different description and Notes fields.
>
> Is this the problem then? That the notes fields are different and that this
> has somehow made the renderer unable to recognise that they are the same
> coastline? I can't imagine that it is ... Or do the coastline segments need
> to be joined together?
>
> I understand that the islands outlined in red are only being flagged as
> wrong because they are currently "on land" so those will disappear when we
> get the coast corrected.
>
> Possibly related to this, I noticed that a section of the coastline had
> gone AWOL around Subic airport, and actually cut across the runway, so I put
> in a temporary section of coastline so that the coast goes outside the
> airport. Its very approximate at the moment, but at least it is
> topologically sound.
>
> Maybe I'll wait and see if this glitch was causing all the problems. I'm
> crossing my fingers that I haven't made things worse, but I thought I'd
> mention what I've been doing here, so that if the sea suddenly drains away
> from the entire Asian subcontinent, you'll know where to point the fingers
> of blame (and where to go to start fixing things ... .).
>
> If anyone else has any bright ideas on how to fix this coastline, please
> help me out here. I'm a little out of my depth (no pun intended), but its
> been broken for several weeks.
>
> Jim
>
>
>
> --
>   datalude: information security
>   e: jim at datalude.com
>   Philippines: +63 2 403 1311 / mob: +63 920 912 5830
>   Hong Kong: +852 9100 7586
>   w: http://www.datalude.com/
>
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