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Old 26-04-2011, 11:18   #721
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Re: Beta Test / Technical

Interesting link about the USGS survey package!
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Old 27-04-2011, 07:54   #722
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Re: Beta Test / Technical

Minor Bug, S57, Obstruction

Viewing the NOAA US5WA45M.000 chart (Bellingham Bay, WA) downloaded from the NOAA Web site.

There are a number of obstructions on the chart which are not displayed correctly. It seems as though these obstructions are displayed as a "default" symbol.

I have no idea whether this is a S57 bug in the NOAA chart, a bug in the S52 library (neither of which I have access to due to the ridiculously priced relevant standards) or a bug in OpenCPN.

It seems as though Obstructions that are polygons are correctly displayed as a hatched area, whereas Obstructions which even though are in a S57 polygon layer, are in fact points, and hence there is no asssociated symbol associated with them.

Find attached a screen capture with some of these incorrectly displayed obstructions.
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Old 27-04-2011, 08:24   #723
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Re: Beta Test / Technical

[QUOTE=stevead;675387]Minor Bug, S57, Obstruction

This is not in the S-52 library. I had notice that in the version 2.4.423 and that is one of the reason why I said:- What the hell did you do? You can check what I sended on the forum.
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Old 27-04-2011, 08:52   #724
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Re: Beta Test / Technical

[QUOTE=stevead;675387]Minor Bug, S57, Obstruction

By the way I forgot to tell you that I have seen the same thing in other programms too. But it's not suppose to be like that.
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Old 27-04-2011, 09:08   #725
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Re: Beta Test / Technical

Steve,
do you know how they should actually be symbolized? Caris and SeeMyENC I checked as reference don't agree with each other... Info is very scarce and OBSTRN04 is probably the most complicated CSP there is, taking into account the type of obstruction, it's depth etc... Anyway I suppose it's not a big deal - ISODGR51 symbol our CSP currently produces looks at least as dangerous as OBSTRN01 in Caris to me
Anyway, if anybody wants to check the logic: OpenCPN: s52cnsy.cpp Source File
These two probably can be handled in the switch beginning on line 1779 (once we know what to display instead)

@P_Dub: Do you notice any difference here from the previous version's behavior? I don't see any changes in the code that could cause it.

Pavel
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Old 27-04-2011, 11:29   #726
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Re: Beta Test / Technical

Folks...

Anybody able to post a screen shot of what it SHOULD look like?

Dave
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Old 27-04-2011, 11:44   #727
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Re: Beta Test / Technical

Dave,
Caris and PolarView display these with OBSTRN01. It also looks like watlev==5 should be symbolized by UWTROC04 and 2 by something like LNDARE01 (at least it looks like that looking at Attribute: Water level effect and the corresponding INT-1 and M-4 symbols). We also miss DANGER53 symbol. I have some more little fixes to the symbolization in the queue - will send you a patch when done.

Pavel
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Old 27-04-2011, 14:43   #728
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Re: Beta Test / Technical

Quote:
Originally Posted by bdbcat View Post
Folks...

Anybody able to post a screen shot of what it SHOULD look like?

Dave
It's easy. Just switch to the raster chart of the same area. You'll see the upper left obstruction (1) should be "Foul", the three lower right obstructions should be "Snags" (3) and two submerged wreck symbols (2 and 4).

Stevead: It would really help diagnose problems with the way objects are rendered if you would do an object query on any questionable objects.

1. Feature Class: OBSTRN

Position: 048 45.7703 N 122 31.0228 W

Attributes
CATOBS foul area(6)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
SCAMIN (59999)


2. Feature Class: WRECKS

Position: 048 45.1213 N 122 30.0481 W

Attributes
CATWRK dangerous wreck(2)
QUASOU depth unknown(2)
STATUS existence doubtful(18)
WATLEV always under
water/submerged(3)
SCAMIN (59999)


3. Feature Class: OBSTRN

Position: 048 45.1294 N 122 30.0029 W

Attributes
CATOBS snag / stump(1)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
INFORM (Snags)
SCAMIN (59999)


4. Feature Class: WRECKS

Position: 048 45.1184 N 122 29.9605 W

Attributes
CATWRK dangerous wreck(2)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
SCAMIN (59999)

Fabbian
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Size:	62.0 KB
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Old 27-04-2011, 15:18   #729
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Re: Beta Test / Technical

Fabbian,
unfortunately things are not always this easy The symbolization rules defined by the S-57 symbolization library which is part of the standard we try to follow are often quite a bit different than what is to be found on the paper charts. In this case very different I have to say.
The only thing on the raster snippet you posted that's at least close to what it should be on the vector charts are the two wrecks and even them should be symbolized as IK-28 (dangerous wreck) and not IK-29...
That's why we need at least CARIS S-57 ENC Object Catalogue and Canadian Hydrographic Service or U.S. Chart No. 1 (even worse as it's not searchable) to find suitable symbolization and that's why it's very time and effort consuming to get it right.

Pavel
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Old 27-04-2011, 16:50   #730
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Re: Beta Test / Technical

Pavel...

In S52 3.2 (the only one for which I have a spec), the object in the northwest:

1. Feature Class: OBSTRN

Position: 048 45.7703 N 122 31.0228 W

Attributes
CATOBS foul area(6)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
SCAMIN (59999)

must symbolize as "isolated dangerous point", for which we choose SY(ISODGR51). The key point is QUASOU==2.

I can't get to SY(OBSTRN01) without ignoring QUASOU and WATLEV.

Of course, Caris may be using a more modern version of the OBSTRN04 and UDWHAZ03. Who knows.

Your patches willingly accepted, (or at least debated....)

Wish we had the most modern S52 specs.....
Dave
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Old 28-04-2011, 01:31   #731
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Re: Beta Test / Technical

Quote:
Originally Posted by bdbcat View Post
Wish we had the most modern S52 specs.....
perhaps those users interested in such features could run a paypal fundraising drive?
when is it likely to change again? NDA/cleanroom implementation needed?


Hamish
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Old 28-04-2011, 03:34   #732
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Re: Beta Test / Technical

Dave...
It's more than sure that there's OBSTRN05 CSP defined in the 3.4 edition as the publicly available "APPENDIX 2, ADDENDUM TO ANNEX A, PART I" (http://www.ecdisregs.com/get_pdf.php?id=48&action=view) uses it... The problem is that the most I can find about how it should work is some old python code from NOAA's Pydro with unclear license that (at least partially) implements it, but no docs at all
http://www.iho-ohi.net/iho_pubs/maint/CS_MD07_Oct09.pdf mentions even OBSTRN06 so the fun will likely continue...

Pavel
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Old 28-04-2011, 06:51   #733
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Re: Beta Test / Technical

Quote:
Originally Posted by bdbcat View Post
Wish we had the most modern S52 specs.....
Dave
http://www.iho-ohi.net/iho_pubs/standard/S52/PresLib_e3.4_Part_I_Addendum.pdf

See page 148.

Fabbian
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Old 28-04-2011, 08:01   #734
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Re: Beta Test / Technical

fgd3....

Yep, that is a symol for "foul ground".

What we do not know is the rules to use this symbol. Those rules are in the S52 CSP definitions, which are in the full 3.4 spec, which we don't have. The symbol is never called for in the 3.2 specs....

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Old 28-04-2011, 08:02   #735
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Re: Beta Test / Technical

Quote:
Originally Posted by nohal View Post
Fabbian,
unfortunately things are not always this easy The symbolization rules defined by the S-57 symbolization library which is part of the standard we try to follow are often quite a bit different than what is to be found on the paper charts. In this case very different I have to say.
The only thing on the raster snippet you posted that's at least close to what it should be on the vector charts are the two wrecks and even them should be symbolized as IK-28 (dangerous wreck) and not IK-29...
That's why we need at least CARIS S-57 ENC Object Catalogue and Canadian Hydrographic Service or U.S. Chart No. 1 (even worse as it's not searchable) to find suitable symbolization and that's why it's very time and effort consuming to get it right.

Pavel
Since US Chart Number 1 is a description of the symbols used on US charts it's a pretty good shortcut to compare the raster chart with the vector chart if you're looking to see how a chart feature should be symbolized.

1. Feature Class: OBSTRN

Position: 048 45.7703 N 122 31.0228 W

Attributes
CATOBS foul area(6)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
SCAMIN (59999)

See chart no. 1, page 45, items 31 and 32.


2. Feature Class: WRECKS

Position: 048 45.1213 N 122 30.0481 W

Attributes
CATWRK dangerous wreck(2)
QUASOU depth unknown(2)
STATUS existence doubtful(18)
WATLEV always under
water/submerged(3)
SCAMIN (59999)

See chart no. 1, page 44, item 28.


3. Feature Class: OBSTRN

Position: 048 45.1294 N 122 30.0029 W

Attributes
CATOBS snag / stump(1)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
INFORM (Snags)
SCAMIN (59999)

See chart no. 1, page 45, item 43.2.


4. Feature Class: WRECKS

Position: 048 45.1184 N 122 29.9605 W

Attributes
CATWRK dangerous wreck(2)
QUASOU depth unknown(2)
WATLEV always under
water/submerged(3)
SCAMIN (59999)

See chart no. 1, page 44, item 28.

Fabbian
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