Here are my polygons of town blocks.
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)
What functions should I use to complete my mission?
Answer
@Pil Kwon, since you have the "same post-code", therefore in QGIS I can suggest:
Vector > Geoprocessing Tools > Convex Hull
Hint: Create convex hulls based on a field.
References:
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