[GRASS5] Re: [bug #2451] DXF support

Sat Jun 5 14:18:49 EDT 2004

I read through the discussion on DXF and DWG support. It is indeed a  
complicated issue. But perhaps there are 2 different aspects to this.

One is support for AutoCAD users. This requires either current DXF or  
DWG support to be most effective. These are complicated by the license  
issues for opendwg and other things discussed in the threads below. Not  
insurmountable, but complicated.

The other is the fact that DXF in some form has become a widely used  
interchange format for a variety of other GIS and CAD programs. Would  
it be easier to support this kind of DXF--for now at least? Would this  
be a lower-level (i.e., older) dxf standard than the current AutoCAD  
one? Just a thought.

Michael
____________________
C. Michael Barton, Professor
School of Human Origins, Cultures, & Societies
PO Box 872402
Arizona State University
Tempe, AZ  85287-2402
USA

Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>
On Jun 3, 2004, at 1:31 AM, Radim Blazek via RT wrote:

> this bug's URL: http://intevation.de/rt/webrt?serial_num=2451
>
> Thu, Jun 3 2004 10:31:11: Request 2451 was acted upon.
>
>  Transaction: Mail sent by blazek at itc.it
>
>        Queue: grass
>         Area: grass5.7
>      Subject: 2 wishes for GRASS 5.7
>        Owner:
>   Requestors: michael.barton at asu.edu
>       Status: open
>
> ----------------------------------------------------------------------- 
> --
> On Thursday 03 June 2004 03:07, Hamish wrote:
>>> 2. More difficult, but I think important. I'd like to see DXF import
>>> and export modules produced for 5.7. Those in 5.3 have considerable
>>> limitations. 5.7 has overall very good I/O routines due to gdal and
>>> ogr. However, OGR doesn't include dxf. This is a major data
>>> interchange format that I think ought to be supported if possible.
>>
>> There is v.in.dwg for this, but it needs a non-free library & you must
>> not redistribute any resulting binaries.
>>
>> see  http://thread.gmane.org/gmane.comp.gis.grass.devel/1205
>>
>> Have there been any improvements in the Free Software solutions for
>> DXF importing during the last year?
>>
>> e.g. libdime
>> Description: DXF Import, Manipulation, and Export library.
>>  Dime is a C++ class library for reading, constructing, manipulating,
>>  and writing DXF file data.
>>
>> http://www.coin3d.org/Coin3D/file_format_libs/Dime/
>>
>> [FreeGIS people: the link on your page is broken]
>>
>> Is the time better spent getting Dime <=> OGR working?
>
> There is no free DXF library supporting reliably latest DXF.
> I see that Dime status has not changed in last years, still:
> "... version 10 through 14, and we've had customers that have used the  
> library to handle
>  AutoCAD 2000 DXF files."
> OpenDWG supports DXF/DWG from 2.5 to 2004. My experience is that  
> AutoCAD
> users use often latest versions.
> Generally, I don't like the idea to pretend that some feature is  
> supported
> if we know that it is not true.
>
> v.out.dxf is something else, it is simple and it should be updated
> to 5.7, but it should read binary file, not ascii.
> It woud be better to have DXF write support in OGR, but I am not sure
> if Frank likes drivers which can write only.
>
> Radim
>
>
> --- Headers Follow ---
>
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> From: Radim Blazek <blazek at itc.it>
> To: Hamish <hamish_nospam at yahoo.com>,
> 	Request Tracker <grass-bugs at intevation.de>
> Subject: Re: [GRASS5] [bug #2451] (grass) 2 wishes for GRASS 5.7
> Date: Thu, 3 Jun 2004 10:30:54 +0200
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