Here are my polygons of town blocks.

enter image description here

The colored towns are considered as areas where they have the same post code.

What I eventually want is to make seamless polygons where there are no gaps between polygons (please see the screenshot below)

enter image description here

What functions should I use to complete my mission?


@Pil Kwon, since you have the same "post-code", therefore in QGIS I can suggest using a "Convex Hull":

Vector > Geoprocessing Tools > Convex Hull

Hint: Create Convex Hulls based on a field.

  • 1
    right. Convex Hull! I couldn't think of it but thanks a lot!
    – Pil Kwon
    Aug 27 '18 at 5:19

Wouldn't you want a concave hull? A convex hull will give you a large amount of area that isn't part of the block. For example, a convex hull would fill in that big gap in the "hook" park of block 1.

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