Opened 21 years ago

Last modified 21 years ago

#238 closed defect (wontfix)

Null MSLink values in ogrinfo

Reported by: jesus.orozco@… Owned by: warmerdam
Priority: highest Milestone:
Component: default Version: unspecified
Severity: critical Keywords:
Cc:

Description 

I found some inconsistences between ogrinfo and dgndump working with DGN files.
In one case, ogrinfo fails to read the MSLink field values (it says null). And
dgndump can get the value just fine.

If you need sample dataset, drop me a line.

Regards

Change History (6)

comment:1 by warmerdam, 21 years ago 

Jesus,

Please attach a file demonstrating this result, and the dgndump and ogrinfo
output for a features showing the problem. 

Thanks,

comment:2 by jesus.orozco@…, 21 years ago 

I'm posting a couple of reports.

  1) dgndump -s

  2) ogrinfo (the first 199 lines)

And sample dataset can be found in www.gmaps.es/dl/dgn

Kind Regards/Saludos
Jesús

=========================================================
begin: dgndump
=========================================================
X Range: 0.00 to 0.00
Y Range: 0.00 to 0.00
Z Range: 0.00 to 0.00
Total Elements: 260151

Per Type Report
===============
Type Cell Header: 130072
Type Group Data: 1
Type Digitizer Setup: 1
Type TCB: 1
Type Level Symbology: 1
Type Ellipse: 130072
Type Application Element: 3

Per Level Report
================
Level 0, 130074 elements:
  Type Cell Header: 130072
  Type Digitizer Setup: 1
  Type Level Symbology: 1

Level 1, 1 elements:
  Type Group Data: 1

Level 7, 1 elements:
  Type Application Element: 1

Level 8, 1 elements:
  Type TCB: 1

Level 9, 1 elements:
  Type Application Element: 1

Level 23, 1 elements:
  Type Application Element: 1

Level 28, 130072 elements:
  Type Ellipse: 130072

=========================================================
end: dgndump
=========================================================

=========================================================
begin: ogrinfo
=========================================================
INFO: Open of `clabsano.dgn'
using driver `DGN' successful.

Layer name: elements
Geometry: Unknown (any)
Feature Count: 0
Layer SRS WKT:
(unknown)
Type: Integer (2.0)
Level: Integer (2.0)
GraphicGroup: Integer (4.0)
ColorIndex: Integer (3.0)
Weight: Integer (2.0)
Style: Integer (1.0)
EntityNum: Integer (8.0)
MSLink: Integer (10.0)
Text: String (0.0)
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OGRFeature(elements):27
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OGRFeature(elements):31
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OGRFeature(elements):33
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=========================================================
end: ogrinfo
=========================================================

comment:3 by warmerdam, 21 years ago 

Jesus, 

It doesn't look like the sample dgn file "stuck".  If you want, you can just
email it to me (zipped).  I would add that your sample output from dgndump
and ogrinfo does not identify a features that is translated improperly.  I
was hoping for the detailed dgndump output for *one* element, and the ogrinfo
output for *one* feature (the feature corresponding to the source element of
course) that show an MSLINK not coming through.  What I am trying to avoid is
spending alot of time poring through dumps myself just looking for a
demonstration of the problem before I even start working out a fix.

comment:4 by jesus.orozco@…, 21 years ago 

Frank,

I finally could upload the zipped file in the website. If you want, you can
download it from http://www.gmaps.es/dl/dgn/. 

It seems that ogrinfo is trying to get the MSLink value from the ellipse
(OGRFeature(elements):7) and dgndump gets it from element 6 (cell header) which
seems right.

=====================================================
ogrinfo
=====================================================

OGRFeature(elements):7
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  GraphicGroup (Integer) = 0
  ColorIndex (Integer) = 0
  Weight (Integer) = 0
  Style (Integer) = 0
  EntityNum (Integer) = (null)
  MSLink (Integer) = (null)
  Text (String) = (null)
  Style = PEN(id:"ogr-pen-0",c:#ffffff)
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=====================================================
dgndump
=====================================================

Element:Cell Header  Level: 0 id:6      
  offset=4724  size=108 bytes
  graphic_group:0   color:0 weight:0 style:0
  properties=18944,SNAPPABLE,ATTRIBUTES,NEW
  totlength=71, name=ALCNOD, class=1, levels=008000000
  rnglow=(-0.50000,-0.50000), rnghigh=(0.49900,0.49900)
  origin=(32652.28000,89837.73000)
  xscale=1, yscale=1, rotation=0
Attributes (16 bytes):
Type=0x5e62, EntityNum=41, MSLink=46512
  0x071f625e810f2900b0b5000000000000

comment:5 by warmerdam, 21 years ago 

Jesus, 

OK, I see the problem.  

The OGR drive built on dgnlib does not do anything with cell headers.  They
are discarded, and the components elements are treated as independent features.
The relationship with the cell header, and any interesting information on the
cell header (like MSLink values) are lost. 

This isn't exactly a bug.  What I could do is:

 o convert cell headers as a feature with no geometry.  This would give 
   something to hang the MSLink value on. 

 o find some way of storing the feature id of the cell header feature to
   which it corresponds on the features derived from elements that belong
   to that cell header. 

The first thing, translating cell headers as geometryless features wouldn't
be too hard, but the second would be hard.  Furthermore, it would be pretty
difficult to take advantage of this except in very customized applications. 
finally, the feature ids are generally not preserved when translating to a
new format, so the relationship wouldn't be easy to preserve even with the 
above actions. 

As such, I am not really too keen to do anything about this.

comment:6 by warmerdam, 21 years ago 

OK, as summarized above, the problem is that cells are not treated as
single features and that the cell header is lost entirely.

For now, I am not planning to change this behaviour as I think trying to
group all the geometry of a cell into one feature would likely be worse than
the current approach, and because just introducing a no-geometry cell header
feature wouldn't likely help Jesus.
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