Does anyone know a way to quickly measure if a map has say 75% green on it
Assuming you've got OCAD:
* Draw an area symbol around the boundary of the map area, select it, use the measure tool to get the area.
* Select all the 'green' symbols (hold down Ctrl to select multiple).
* Right-click the symbol list, Select by symbol..., All objects with selected symbol.
* Measure tool to get the cumulative area of everything selected.
Assumes the mapper hasn't overlapped green areas, but should give you something to work with.
Point-feature density is easy - count point features, divide by area. Ignore rocky/broken ground.
or 25% smooth contour lines vs squiggly lines or little hills
Define 'squiggly' mathematically. :)
If you had lidar for the area you could probably work out steepness/average gradient...? I want to suggest average length of contour line symbols, but I'm sure there's a mapper out there who draws all their contour lines in 20m sections.