Answer:
The R.F. (or "Relief Factor") of a map is a measure of the difference between the highest and lowest elevations of the land represented on the map. It is often expressed as a ratio of the highest elevation to the lowest elevation.
For example, if the highest elevation on a map is 1,000 feet and the lowest elevation is 500 feet, the R.F. would be 2:1 (1,000/500).
In order to find the approximate R.F. of a map, you will need to measure the highest and lowest elevations on the map. This can be done using a ruler or by using a digital elevation model. Once the highest and lowest elevations are known, the R.F. can be calculated by dividing the highest elevation by the lowest elevation.