I dissolved UK postcode polygons at the sector level to create the postcode sector polygons I need. However, I seem to have more postcode polygons than I expected, about 800 additional postcodes that aren't in the national statistics data.
I added a binary indicator to all of the postcode sectors I got from the national statistics office in the UK (ONS), and visualised them. I got the following:
And also at a higher zoom, this:
I'm not able to select these small square dots and I don't seem able to find them in the attributes data. For example, when I search for polygons based on area and rank them, the sectors with the smallest areas are too big to be these dots, for example:
Pcd.Sector Area M60 8 73 VGU02 129 PH2 1 149 VUB01 616 DL981 807 VSE04 847 M60 7 1101 OL133 1263 W1A 3 1264 EC4N1 1450 EC3A2 1537
I'm really not sure what these are, has anyone seen these before?