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

Eugene Alvin Villar seav80 at gmail.com
Sun Jul 4 07:23:24 BST 2010


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?
>
>
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