[talk-ph] Correcting Philippine coastlines

Fri Sep 19 16:35:44 BST 2008

Maning, Ian,

Sure, glad to help.

It would be easiest for me to import directly from the GNS data since I have that and the import script all set up, but let me just check I understand.  The objective is to import island names as nodes, e.g. place=island, name=xyz - i.e. just nodes not coastline ways with island name attached.  And is there any extra info or edits in gnet_islands_ph.zip ? I know for example that the GNS coordinates are very course so names for small islands (less than 2km across) may not be accurately placed.

Mike

At 10:30 AM 19/09/2008, maning sambale wrote:
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>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 |
>| '-._"7' |"Freedom is still the most radical idea of all" -N.Branden|
>| /'.-c |Linux registered user #402901, http://counter.li.org/ |
>| | /T |http://esambale.wikispaces.com|
>| _)_/LI
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