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World Shorelines Vector Data

posted by Satri on Wednesday June 14, @07:04AM        Permalink  Trackback URI  Slashdotthis  Diggthis  Del.icio.us
from the good-data-is-good dept.

The EVS-Islands blog discuss and links to freely available world shorelines datasets. From the blog: "After a preliminary look, I can confidently state that PGS is a major improvement over WVS. At 1:250,000, PGS shows a different shoreline than WVS shorelines. At larger scales (1:25,000) they show a shoreline that is very close to Landsat-7 imagery, whereas WVS is clunky and coarse." Update: 06/14 13:10 GMT by S : Link updated, thanks emj :-)

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Application Domains: World Vector Land-Water Mask [+]

The useful EVS-Islands blog discuss the creation of a global land-water mask in vector format (screenshots included). From the blog: "Regular readers know that I am a long time user of World Vector Shorelines (WVS). These vectors cover the world at a scale of 1:250,000. If you download them, you will see that they are not polygons, but line files. I have always wanted to create a land-mask of all land areas within this database, but have never had the time, software or computer calculating power. That was until yesterday. [...] I let my reader know that the 1-kilometer global land-sea mask he currently was using was, probably, the best going. He knew of the Globcover LULC 300-meter grid cell version coming out in the first part of February 2008 to be created and made available by ESA. [...] Using a simple routine within the digitizing tools, I created polygons from lines." Mr. Minton's new dataset is freely available from the blog entry. The topic of world shorelines datasets was previously discussed here over a year ago.

• broken link

  (Score:2, Informative)

  by emj (430) on Wednesday June 14, @08:04AM (#708)

  The link doesn't seem to work, this is the correct link [blogspot.com].
  • Re:broken link

    (Score:3, Informative)

    by emj (430) on Wednesday June 14, @09:30AM (#711)

    Uhm the link to Prototype Global Shoreline Data (Satellite Derived High Water Line Data) [nga.mil] apperantly got mangled in the EVS-Islands post. It seems like a bad link day.

    [ Parent ]
• Followup by EVS

  (Score:2)

  by Satri (3) on Thursday June 15, @07:59AM (#716)
  ( http://alexandreleroux.blogspot.com/ | Last Journal: Friday March 17, @04:07PM )

  EVS compares his vectors with the PGS vectors in this blog entry [blogspot.com]. As far as I know (but never confirmed :-), EVS vectors don't have worldwide coverage while the PGS do. Right?
  • Re:Followup by EVS

    (Score:3)

    by Satri (3) on Thursday June 15, @08:03AM (#717)
    ( http://alexandreleroux.blogspot.com/ | Last Journal: Friday March 17, @04:07PM )

    Ok, I should have checked before posting. The EVS vectors does not cover the whole planet but offers freely *a lot* of processed shores!

    [ Parent ]
• More shorelines data from

  (Score:2)

  by Satri (3) on Friday July 21, @07:43AM (#837)
  ( http://alexandreleroux.blogspot.com/ | Last Journal: Friday March 17, @04:07PM )

  the National Geospatial Intelligence Agency.
  
  Learn about it here [blogspot.com].