discrepancy raster position DGN vs. DWG

Dear Microstation-Users
I have a problem with the position of a raster.
In DGN-Mode the raster with its frame is on the position that also is shown in the element information as origin.
When I save the drawing as DWG or DXF the position of the frame differs in one direction with the amount of have a pixel, while the origin shown in elelment information is as in DGN-File.
The txt-file shows the details/coordinates of the orthophoto, when it was calculated.
The left-corner bottom of the raster should be X=0, Y= 437.2900. The size of the raster is 115.38mx28.45m, Pixels size 1 cm.
What to do to get the image on the wanted position when saving as DWG/DXF?

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  • so its not geo referenced... what format is this raster ? does it use a jgw or sister file?

    try to convert it to a different raster format via the raster manager  then export to dwg and see if better result with a  different raster type.....

    Can you upload the dgn and its  raster, but firstdraw abox around the raster in dgn, snap to the edges of the raster so we can see if it moves,   when we can try and export to dwg and see what happens at our ends....

    Lorys

    Started msnt work 1990 - Retired  Nov 2022 ( oh boy am I old )

    But was long time user V8iss10 (8.11.09.919) dabbler CE  update 16 (10.16.00.80) 

    MicroStation user since 1990 Melbourne Australia.
    click link to PM me 

  • Hello Lorys

    Thank you for your quick response.
    The raster is a png-File.
    As you supposed I saved it in a different format (tiff) in my dgn-file and saved it again as dwg. But the movement of the origin in obe direction of half a pixel still was the same.
    By the way, sorry for being anonym - my name is christoph
  • go back to the  tiff and try  jpeg and save as  v8i and tell it to use a sister file, then I think in acad it will use the  syster file to ref attach position , pixel size etc, the sister file should be a jgw format and should be possible to create in in mstn .. I havent  built one in years  ... but I remember there is an option in the export in the raster manager ....

    BTW I've never seen this happen before....I use aerial photo jpgs all the time and they  have jgw sister files and autocad  knows what to do with them so the exports work for me, but we have the jgws already....

    alternative google  jgw and  how to make  it from the settings of the  property of the raster, they are  just text files.. gotta go .. cant  help any more to night..

    upload copy of this raster and its dgn .. might take a look over the weekend....

    Lorys

    Started msnt work 1990 - Retired  Nov 2022 ( oh boy am I old )

    But was long time user V8iss10 (8.11.09.919) dabbler CE  update 16 (10.16.00.80) 

    MicroStation user since 1990 Melbourne Australia.
    click link to PM me 

  • Dear Lorys

    Thanks for your detailed advice and your offer to have a look on the files.
    For privacy reasons I am not authorised to share them.
    I will have another try with your hints on monday.

    Kind regards
    Christoph
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