[gdal-dev] unable to open DGN

[Andre Vautour]

Right, thanks, I wasn't thinking of that when I wrote my reply.

Guess it makes sense for a closed format such as DWG. Might not make as 
much sense to use it for DGN which is more open and does not need to be 
reverse engineered.
André

On 2015-11-23 11:41, Ivan Lucena wrote:
> Just a comment on that: In order to build the DWG driver, you or your company, need to be part of some kind of alliance to be able to download a full version of the Teigha SDK. AFAIK
>
> ________________________________________
> From: gdal-dev <gdal-dev-bounces at lists.osgeo.org> on behalf of Andre Vautour <andre.vautour at caris.com>
> Sent: Monday, November 23, 2015 9:58 AM
> To: Brad Hards
> Cc: gdal-dev at lists.osgeo.org
> Subject: Re: [gdal-dev] unable to open DGN
>
> On 2015-11-20 17:40, Brad Hards wrote:
>> On Fri, 20 Nov 2015 02:20:55 PM Martin Landa wrote:
>>> I am trying to open sample DGN file, but it fails. I guess that the
>>> reason is unsupported version (man pages says: Microstation DGN files
>>> from Microstation versions predating version 8.0 are supported for
>>> reading.)
>> As I understand it, version 8 is completely different.
>>
>>> Is there any possibility how to read this file using GDAL library?
>> AFAICT, not unless you figure out version 8 format and implement it, or pay
>> someone to do that work for you.
> I just want to add that Teigha, which can currently be used to open DWG
> in GDAL, does support DGN version 8. So, if someone wants to add that
> support, I'd suggest looking at the DWG driver.
>
> The DWG driver has:
> class OGRDWGServices : public ExSystemServices, public ExHostAppServices
>
> You'd need to have something like:
> class OGRDGNServices : public OdRxSystemServices, public OdDgHostAppServices
>
> I would not be surprised if considerable chunks of the DWG driver could
> be generalized to work for both DWG and DGN,
> André
>
>>    Is it possibly to get the originator to
>> provide it in some other format (e.g. DXF, noting that will lose the
>> georeferencing)?
>>
>> Brad
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