Camera Calculator Using Imported Drawings

What is the best (or most commonly used) tool for mapping out camera placements on a drawing? The camera calculator tool is great for google maps drawings but I am looking for something that works with a drawing. Can you import an image (bitmap, pdf) into the calculator? We currently use Visio but I am looking for something easier for my team to use.

[UPDATE: The IPVM calculator now supports importing PDFs and images for drawings / floorplans, etc. This can be used on top of the Google Map or in our blank mode.]

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