09LT - TIFF scaling

[gcelecinc]

I used a scanned in drawing to pdf and saved it to a TIFF file. I uploaded the TIFF file into a DWG file as an underlay. I need to set up the drawing so that I can get correct scaling for linier measurements.

Thanks

[jaberwok]

Pick an image line which is horizontal or vertical and of known length. Assume a horizontal line.
Draw vertical lines at each end of the image line and another line at the proper distance and a horizontal line joining them. With osnap=INTersection use the Relative option of the Scale command to scale the image.

+------------------------------+------------------------+
start of line................end of line............true length of line

[gcelecinc]

Is this how to set up the scale so that anything drawn over the underlayment will calculate using the LS command? I have drawn many polylines representing computer cabling runs from the server to each user station. I need to find the length of each run using the LS command.

Thanks for your response.

[jaberwok]

Yes. If you scale to actual size, the polylines should LIST at the correct length in plan view. You may have to consider adding length for elevation changes.