[talk-ph] Correcting Philippine coastlines

maning sambale emmanuel.sambale at gmail.com
Fri Sep 19 09:30:03 BST 2008


On Fri, Sep 19, 2008 at 3:26 PM, Ian Haylock <haylocki at yahoo.co.uk> wrote:
> Hi,
>
> I think the coastline from Manila to the part of Cavite should be ok, as
> I've been editing this area. I noticed last year that Boracay had been done,
> as well as some of the Island to the south of Boracay.
>
> Spotting coastline that needs updating should be fairly easy by examining
> the area using the slippy map, srtm coastlines usually have the horrible
> step like appearance.
>
> It would be nice to add the names to the islands as they are updated, but as
> I don't know what they are, do you know of a source where I can find out ?

I'm sending you a zip file containing all the island/islet names for
the Philippines from GNS
(http://earth-info.nga.mil/gns/html/index.html).  Data is in public
domain, hence, no licensing issues.  I converted the data to shapefile
years ago.  This is the same data source where Mike Collinson (cc'd
here) made the data Municipalities/Cities name import.

Mike can you help us out again in importing island names this time?

> Now I remember why I hated fixing the coastline before, you spend 5 minutes
> editing, and 20 minutes waiting for the upload to finish.

OSM database seems to be better now, don't you think?


And the Philippines even getting better :)

cheers,
maning
> Cheers, Ian
>
> --- On Fri, 19/9/08, maning sambale <emmanuel.sambale at gmail.com> wrote:
>
> From: maning sambale <emmanuel.sambale at gmail.com>
> Subject: Re: [talk-ph] Correcting Philippine coastlines
> To: talk-ph at openstreetmap.org
> Date: Friday, 19 September, 2008, 7:32 AM
>
>>
>> The script coast_josm.pl produces the same output, as the code used on the
>> web page is based on the coast_josm.pl script.
>>
>> I think using either of the above methods would be a lot quicker than
>> tracing all the coastline by hand, and produce a pretty accurate
> coastline.
>>
>> I've uploaded the data for the island, here's a link to the area :
>>
>>
> http://www.informationfreeway.org/?lat=19.318031414701732&lon=121.45548518653908&zoom=12&layers=B000F000F
>
> Calayan Island! Home of the endemic newly discovered bird Calayan
> Rail.  Yeah that looks nice.  Please update as many islands as you
> can.  We just need to be careful with
>  uploading large areas.  We might
> break into other contributor's work.  AFAIK, metro manila coast has
> been edited already from Yahoo!, so the PGS would be useless there, as
> well as in Davao.
>
> cheers,
> maning
>
>> I'll delete the original coastline, and fix the new one when
> you've had a
>> look.
>>
>> Cheers, Ian
>>
>> --- On Fri, 19/9/08, maning sambale <emmanuel.sambale at gmail.com>
> wrote:
>>
>> From: maning sambale <emmanuel.sambale at gmail.com>
>> Subject: Re: [talk-ph] Correcting Philippine coastlines
>> To: talk-ph at openstreetmap.org
>> Date: Friday, 19 September, 2008, 2:09 AM
>>
>> Thanks for the lakewalker tip!  I didn't get it to work before, but
>> now it's working quite fine for the lakes I'm currently processing
>>
>> On Thu, Sep 18, 2008 at 9:19 PM, Ian Haylock
>>  <haylocki at yahoo.co.uk>
>> wrote:
>>> Hi,
>  also just remembered when I was fixing the coastlines last year,
> some
>> of
>>> it was much better quality than the srtm coastline as it used the
> Almien
>>> Coastlines script.
>>>
>>>
>>
> http://wiki.openstreetmap.org/index.php/Almien_coastlines_(PGS)#Identifying_coastline_data
>>>
>>> I was hoping someone would finish uploading all the coastline.
> Don't
>> know if
>>> the reason it hasn't been, is because the data doesn't cover
> the
>> whole of
>>> the Philippines .
>> It actually has complete coverage for the Philippines, give a few
>> incomplete segments.  If we want to continue importing them, we need
>> to inventory which areas of the SRTM coastline are already edited in
>> detail.  From experience, the PGS coastline has a couple of errors and
>> manual edits are still needed.  The source of the PGS coastline by the
>> way
>  is also Landsat images.
>>
>> Feel free to
>>  test import in some area and lets see how it goes in
>> terms of efficient workflow and effort.
>>
>>
>> cheers,
>> maning
>>
>>
>>> Cheers, Ian
>>>
>>> --- On Thu, 18/9/08, maning sambale <emmanuel.sambale at gmail.com>
>> wrote:
>>>
>>> From: maning sambale <emmanuel.sambale at gmail.com>
>>> Subject: [talk-ph] Correcting Philippine coastlines
>>> To: talk-ph at openstreetmap.org
>>> Date: Thursday, 18 September, 2008, 2:05 AM
>>>
>>> Hi,
>>>
>>> I am documenting my progress in editing island coastlines.  Please add
>>> more in the list.
>>> We have more then  7,100 to correct :)
>>>
>>>
>>
> http://wiki.openstreetmap.org/index.php/OSM_Philippines_Data_Import#Coastline_Corrections
>>>
>>>
>>>
>  cheers,
>>> maning
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| __.-._ |"Ohhh. Great warrior. Wars not make one great." -Yoda |
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| /'.-c |Linux registered user #402901, http://counter.li.org/ |
| | /T |http://esambale.wikispaces.com|
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