“Obstructions that cover”, there’s more

Ben Ellison

Ben Ellison

Panbo editor, publisher & chief bottlewasher from 4/2005 until 8/2018, and now excited to have Ben Stein as very able publisher, webmaster, and editing colleague. Panbo is going to the next level in 2019 and beyond.

3 Responses

  1. MacENC says:

    Problem is (in this case), the S-57 ENC data the rock is not tagged as an obstruction (most are) but instead as “nature of surface” (i.e. what’s the composition of the sea bottom). MacENC uses text to render the nature of surface (i.e. mud, sand, rock, gravel, grass, etc).
    So it is an easy change to make the assumption that any rock that is in shallow water is also an obstruction and as such be rendered with the normal (*) graphic. The downside is that it may not actually be an obstruction, but instead just a rocky bottom.
    As noted before the S-57 ENC specification does not make rules in regards how to render features. Only when features should be rendered are specified.

  2. Ben Ellison Ben Ellison says:

    Hmmm…hard to understand this rational as I’ve just seen 3 other ENC viewing programs all recognize the rocks as (*) rocks. Is there any other viewer aside from MacENC that shows them as “nature of surface” (i.e. nature of bottom surface)? If you are using 3rd party software to interpret raw ENC files, as SoftChart and others do, could the problem be there? There is a serious difference between rocks that uncover and a rocky bottom.

  3. MacENC says:

    Most likley those three viewers use the SevenC’s S-57 ENC reader. MacENC does not use this common reader because they do not offer a Mac version.
    The next release of MacENC (releases come out on a monthly basis – all users receive them at no charge) will show “rocks” (Feature: Nature of Surface) that are in the shallow waters as the standard “*”. Not a big change to make.
    MacENC works directly with the FREE public NOAA ENC data. That is the ENC data is not run through any third party translator. This is much preferred so chart updates are as simple as going to the NOAA ENC site and downloading them.

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