[gdal-dev] OGR about s_57
warmerdam at pobox.com
Tue Sep 1 13:46:56 EDT 2009
> Hi, everyone,
> I=A1=AFm now interesting in displaying ENCs.
> I know the OGR can support the s57 format files and it can get some=20
> data like point=A1=A2line=A1=A2polygon. But it cannot support the style=
s as Mr=20
> Frank Warmerdam told me. Now, I have such questions:
> 1. Where can I know what OGR does support and does not support=20
> about s57 ? Does it get the symbols(no, right?)?
OGR does not read the actual graphical symbols. For instance,
we might have a feature from the WRECKS layer like below with
various valuable attributes, but actual wreck symbol.
RCID (Integer) =3D 2164
PRIM (Integer) =3D 1
GRUP (Integer) =3D 2
OBJL (Integer) =3D 159
RVER (Integer) =3D 1
AGEN (Integer) =3D 540
FIDN (Integer) =3D 2135161787
FIDS (Integer) =3D 688
LNAM (String) =3D 021C7F43FBBB02B0
NAME_RCNM (IntegerList) =3D (1:110)
NAME_RCID (IntegerList) =3D (1:517)
ORNT (IntegerList) =3D (1:255)
USAG (IntegerList) =3D (1:255)
MASK (IntegerList) =3D (1:255)
CATWRK (Integer) =3D 1
QUASOU (String) =3D 2
WATLEV (Integer) =3D 3
POINT (61.1031909 -32.4450159)
> 2. If I have got the color and symbols, How could I know which=20
> kind of color the line(or polygon or something else which I get with th=
> help of OGR) should match with?
You would normally read the S52 specification and use it to
determine appropriate coloring, styling and symbolization
from the attributes of a feature. I haven't actually reviewed
the S52 specification, but I imagine it has rules for how
to draw wrecks that might indicate different symbols depending
on the CATWRK (Category of Wreck) and WATLEV (Water level
effect) attributes of the feature.
> 3. Has anyone done such things, can you help me something?
I know lots of people have made various levels of effort in
following the S52 specification based on OGR as a feature
reader. Perhaps some of them will speak up and volunteer
> 4. I know the file =A1=B0IHO ECDIS Presentation Library=A1=B1 can=
> but I don=A1=AFt know how to get it, can you?
Normally the IHO web site should have instructions on ordering.
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox=
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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