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Calculate Background Image Scale (v10)
How to Calculate A Background Image Scale
Calculate is used to calculate/confirm the scale of electronic plans. When paper plans are converted to electronic plans Murphy;s law becomes a key factor. There is only one way to insure yourself against accidentally getting a hold of a set of electronic plans with the wrong scale. The EDGE Calculate function eliminates that possibility from happening to you.
Most background images come with a scale denoted in the title box of the drawing. Do not readily accept the scale noted. The plans have been copied, imaged and reduced. You should always use The EDGE Calculate Background Image scale feature to set the scale.
- To set the scale, you must know a known distance. We can find this by zooming in on the background image using the navigator and zoom slider. Click and drag the slider to the right until you can locate a dimensioned line or even a scale bar in an emergency. Try to find the longest line possible. Once you’ve located a line you are able to read the dimensions on zoom in as close as possible.
- Now click the Calculate icon
- Next, with your mouse click the beginning point of the dimensioned line you chose and then the ending point of the same line. The Calculate Scale window will pop up (seen below) and asks you to enter the distance of the line. Dimensions should be entered in feet and inches or decimal e.g. 50′, 50’6″ or 50.5′. For this example we used a 98′ dimensioned line.
- Click OK. The page will now display the appropriate scale for the background image. You are now ready to digitize using the background image.