I was given a shapefile made up of a few thousand squares. The data in the squares has 5 different values. I wanted to merge all the common values into the same polygon to simplify things. This is what it looked like.
I used the the Select by Expression tool to select all the polygons of the same values and then used the Merge Selected Features tool to merge the polygons together. I was hoping I would be left with 5 geometries that held each value. However after the merge I had vertical stripes through each of the zones as shown here.
I suspect that I'm looking at polygons that have points that are not exactly at the same coordinates. I also suspect that it is a problem created by the software program that generated the shapefile. I was able to confirm this by using the Snap tool to move the points and snap it back over the other one and then I could merge the polygons together. I don't have the time nor the patience to do that for every point on the map.
I've tried to use the GRASS clean tools to get rid of these points as well as a few other tools I could find and have searched the forum for solutions, but after an afternoon of not getting anywhere, I've decided to see if anyone could help me figure this out. I've provided the (Shapefile Data) here if someone wants to try to do it.
How do I clean this up?
I'm running 2.18.14.