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

Eugene Alvin Villar seav80 at gmail.com
Sun Jul 4 07:26:00 BST 2010


Oh BTW, I don't think we should do this automatically. Human input is still
needed just to quickly verify that the PGS coastline does indeed match the
Landsat imagery.


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?
>>
>>
>


-- 
http://vaes9.codedgraphic.com
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