I have a building blueprint image that I need to calculate the sq ft for. However I have no reference or basemap to manually georeference in ArcMap. There is a scale bar on the image. How can I use the scale bar to georeference this image and calculate the sq. ft?
The problem I find with scale bars in general is if the original image was altered in anyway it would be incorrect...say from an 8x11 to 11x17. This would be off quite a lot.
My attempt would be to load the image into ArcMap and as best as you can get the scale to match your 'measurement tool'. Although this may be challenging; for example your image says, '1in = 100feet', this will change based on the size of the image. Match the scale as best as you can. I'd then digitize the blueprint within arcmap as a polygon and then calculate the SQ ft. in the attribute table.