[Gdal-dev] DGN format and projection support

[Brent Fraser]

Jeff, Frank,

  Last I heard (8 years ago!), Intergraph had no plans to publish format or
provide an open/free API to the coordinate system definition MGE/GeoMedia
apps store in the type 56 element of the DGN file.  But times change; maybe
they're open to the idea these days...

  And I doubt if the type 56 element is read by any Bentley Systems products
(including Microstation).

  Jeff, which application are you planning to use with the DGN files?

Brent Fraser
GeoAnalytic Inc.
Calgary, Alberta


----- Original Message ----- 
From: "Jeff L." <nf10 at hotmail.com>
To: <warmerdam at pobox.com>
Cc: <gdal-dev at lists.maptools.org>
Sent: Tuesday, October 18, 2005 12:05 PM
Subject: Re: [Gdal-dev] DGN format and projection support


> Hi Frank,
>
> Thank you for your response. DGN can store projection according to this
> document:
> http://support.intergraph.com/TechNotes/MicroStation_Define_CSF.pdf
>
> The paragraph of the document that mention the projection is:
>
> "The design file has its projection/coordinate system and mapping working
> units stored in a format that can be easily read by Intergraph mapping
> software applications such as GeoMedia and MGE. The assigned projection
> information is stored in the header of the design file as a Microstation
> element type 56."
>
> Any work around to produce DGN with coordinate system ?
>
> Jeff
>
>
>
> >From: Frank Warmerdam <warmerdam at pobox.com>
> >To: "Jeff L." <nf10 at hotmail.com>
> >CC: gdal-dev at lists.maptools.org
> >Subject: Re: [Gdal-dev] DGN format and projection support
> >Date: Tue, 18 Oct 2005 13:46:47 -0400
> >
> >On 10/18/05, Jeff L. <nf10 at hotmail.com> wrote:
> > > Hi,
> > >
> > > I downloaded GDAL source code and tried out the DGN as an output
format
> >but
> > > it seems that the DGN ogr driver does not support coordinate system.
Is
> >this
> > > correct ? if yes, I'm wondering if there is any work around this to
> >generate
> > > DGN with coordinate system ? (scenario: convert mapInfo files to dgn)
> >
> >Jeff,
> >
> >Your analysis is correct.  I don't know how Microstation stores
> >coordinate system information in DGNs, and I suspect that in
> >most geographic maps they don't even bother.
> >
> >Best regards,
> >--
>
>---------------------------------------+-----------------------------------
---
> >I set the clouds in motion - turn up   | Frank Warmerdam,
> >warmerdam at pobox.com
> >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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