How can distance (north- south) between two isolines be calculated?

Discussion created by on Sep 8, 2010
Latest reply on Sep 9, 2010 by wannaz
Perhaps is this a very simple operation (then please forgive my ignorance), but I am not yet sure about how to proceed with this task. I have a vague idea about using euclidian distance for both lines combined with zonal statisics...

The attached figure illustrates the challenge. Any ideas about how to solve it will be highly appreciated.