[Qgis-user] importing dwg/dxf

[Nicolas Cadieux]

Hi,

.dwg or dxf have no CRS.  They can be in inches, feet, mm, cm, m... 
Usually meter in a local CRS like a local WGS84 UTM ZONE is used.  You 
can usually find this in the metadata if available.

Nicolas

On 2021-11-21 9:07 a.m., Greg Troxel wrote:
> Boaz Bar Ilan<boazprosie at gmail.com>  writes:
>
>> i always have problem importing dwg or dxf .  the layers  dont fit the
>> coardinations and even when i set the layers crs it doesnt work.
> I am far from an expert, but recently tried to deal with a dwg.
>
> My impression is that they are almost always in local coordinates, and
> the path to success is something like using GeoScience plugin to define
> a local CRS based on control points where you know global coordinates
> and local, and then to use that CRS for the data.
>
> I recently imported some "PNEZD" data (csv with point it, northing,
> easting, vertical, and description, all in an unspecified local grid,
> from a total station data collector) and used geoscience to align it
> wtih RTK obsservations of a few points, and things fit quite well.
>
> How are you getting dwg?  Are you using the proprietary dwg library with
> gdal, or is there some open source path?
>
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-- 
Nicolas Cadieux
https://gitlab.com/njacadieux
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