Geo-ref Question

I am working on a drawing and some how the geo-referencing got messed up.  Is there an easy way to put is back on track?  Maybe re-defining the 0,0 point?

Comments

  • Hi John, If you are talking about inserting geo referenced images then check that your insertion units are set to the same units as the image. I remember at one point BC was using this value as a multiplier (but it depends which version you are using)? 
  • I am now using v13, but I know this was messed up when I was using v12.
  • Hi John,

    Geo-referencing can mean different things to different people. At the very simplest, it may just be a displacement (i.e your drawing may have moved in X and Y directions only), in which case you will just need to MOVE (using move command) it back to where it should be. To be able to do this, you need to know how much to move it in each X and Y directions. I am assuming you don't know because I have been in the same boat before as well. I would try and look for any clues to correlate between the drawing and something in the real world. For example, if you have the geographic coordinates of a real world point that you can identify on the  DWG, you can just move the entire drawing using these two coordinates as the source and target.

    Going further, as Daniel wrote, if you have scaled up/down units due to the insert units, you can use the SCALE command and re-scale the entire drawing back to its original size. Example: if your expected units are METERS and the drawing is now scaled as INCHES, you can work out the appropriate scaling factors and scale the drawings.

    More complex geo-referencing, as handled by GIS packages involve scale, rotate, move combinations. Not sure if your situation falls into this category. maybe not!!

    Hope this helps in some way.

    Regards
    Rakesh Rao
    http://rakeshrao.typepad.com
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