NoiseMap supports three main Outline types - buildings, water and area. These areas are not transparent and the colour can't be changed, so they are not suitable for generally shading other areas of the map.
But NoiseMap also has three line types. You could use these to outline an area and then draw lines or hatching within the outline. You can even convert an outline in a digital map that way. But you would have to draw the cross-hatching by hand and it might be difficult to get the lines evenly spaced and parallel.
You can then add annotation to describe the area concerned.
Look up outlines or annotation in Help for more information.
