I have read a number of posts and tutorials, even the QGIS manual on snapping. I set the snapping options under settings>snapping options; selecting the two layers that I would like snapping on, setting the mode to vertex, the tolerance of 0.00002 map units and checked avoid int. and enable topological editing.
I moved the on polygon on layer one, grabbing the approximate vertex to the adjoining approximate vertex on layer two. at a scale of 1:500 it looks as though it snaps correctly, but when I zoom in to a scale of say 1:1 they are not aligned properly. Am I missing something or attempting to be to accurate?
Thanks for the input.