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rafter image scaling in autocad 2002

rafter image scaling in autocad 2002

rafter image scaling in autocad 2002

(OP)
Hello,
I'm a transportation engineer and am trying to retrieve a particular intersection from an aerial drawing image(in the form of *.tif)to an autocad 2002 drawing. I would like to have the drawing in autocad to a prticular scale. How can I do this?

RE: rafter image scaling in autocad 2002

insert the raster image at the following scale:

scale = width in pixels * scale of tif image
        ------------------------------------
                 resolution in dpi

That should get you what you need.

An example, I have a quad map (scale 1" = 2000'), the width in pixels is 4873 and the resolution is 250 dpi.
So I insert it at the scale of

scale = (4873 * 2000)/250   =  38984
       
Hope that gets you what you need.

Mick

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