I am a newbie to QGIS and don't know if the following is possible so would be grateful of any thoughts.
I have a hill, most of which is given over to rectangular pasture fields. I hypothesize that the longwards alignment of the majority of the fields is parallel to the slope but would like to prove this. I already have a DEM from which I have generated slope, hillshade and contours over which I can overlay colour mapping. Any ideas how I can use QGIS to prove my hypothesis?