GIS Files 4: Putting it all in a system

4.4: Show me the way to go (4)

Optimum-path analysis

Network analysis doesn't have to be carried out on vector link and node data. As discussed in the previous section, Overlay operations, raster data can be effective in describing continuous varied surfaces. This quality of raster data is useful for identifying the optimum path (path of least resistance or shortest path) through a continuous surface.

For example, a company needs to erect electricity pylons from A to B. They need to make sure that they disrupt the forest areas as little as possible. The GIS calculates the path of least resistance, by finding the path that adds up to the lowest value. A vector line can then be added to show the location of the proposed route.

How an optimum path is calculated

Finally in this chapter we will look at some examples of how different types of organisation benefit from the range of functions described in the previous pages.

< 4.4: Show me the way to go (3) | 4.5: Some simple GIS examples (1) >