[Mapserver-users] Does anyone know how to view an individual layer in a DGN file?

[Oliver Wesp]

I suppose you can specify a single layer within your DGN-File using

LAYER
    NAME "Water_dgn"
    TYPE POLYGON
    CONNECTIONTYPE OGR
    CONNECTION "data/dgn/wat.dgn"
            DATA "1"
    STATUS ON
    CLASS
      ...
    END
...
END

for example. This should reference Layer Number 1 within your DGN-File. 
According to the OGR HowTo you can also specify a layer by his name. But 
in the OGR HowTo you will also find the following about DGN and I wonder 
if that means that it's not possible to display just a certain layer.

"The entire DGN file is represented in OGR as one layer (see 
http://ogr.maptools.org/drv_dgn.html for more info)"

best regards
Oliver


Stephen Clark wrote:
> Hi all,
>  
> I have some Microstation DGN file that are comprised of several layers 
> of data.
>  
> How would I view only one layer at a time using a layer file?
>  
>  
> Here is what I have to view the entire DGN file:
>  
> LAYER
>    NAME "FDP_2001_dgn"
>    TYPE LINE
>    STATUS ON
>    CONNECTIONTYPE OGR
>    CONNECTION 
> "d:/sclark1/server_data_copy/datasets/forest-data/TPL/fdp-dgn-utm/fdp_2001_utm.dgn"
>   CLASS
>  COLOR 0 255 0
>   END
>   PROJECTION
>      "AUTO"
>   END
>   METADATA
>     WMS_TITLE "FDP 2001"
>     WMS_ABSTRACT "N/A"
>     WMS_SRS "EPSG:26910"
>   END
> END
>  
> There are approximately 24 layers in the file.
>  
> Thanks,
> Stephen
>  
>  


-- 
Dipl.-Geogr. Oliver Wesp
Gesellschaft fuer geografische Datenverarbeitung
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