The first step is to convert the color map to a bitonal image using the Histogram tool. The image will be displayed as white pixels on a black background so you’ll use the Invert tool to change it to black pixels on a white background.
Since the imagewas originally scanned from an old map, it has a lot of extra pixels and smudges. You’ll use the Despeckel and Touchup tools to clean it up and then use the OCR (Optical Character Recognition) tool to convert some of the raster text to AutoCAD text, taking advantage of the ability to recognize different languages.
A variety of 3D solid modeling tools enable you to create the main building model. To add more detail, and save time, you’ll install the free SketchUp import app. You can search the SketchUp warehouse for free models that you download and insert directly into your AutoCAD model. You’ll insert a column for the porch and then use the associative array functionality in AutoCAD 2013 to create two levels of columns.