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I have files that representes individual houses and blocks. I want to have a file that represents a residential area in a block.

Is there a way to erase the line, boundaries, between polygons that are adjacent?

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    Sounds like you want to dissolve or merge the polygons. – csk Jun 7 at 21:18
  • In ARC/INFO this was possible on-the-fly using DROPLINES, which is a function I have not found in ArcGIS Desktop or ArcGIS Pro. Dissolve remains the workaround there. – PolyGeo Jun 7 at 21:21
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    As a matter of fact, it worked! Thanks @csk – monica Jun 7 at 23:43
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QGIS has two tools to remove boundaries between adjacent (touching) polygons:

  1. Dissolve tool (Processing toolbox > Vector geometry).

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  • The dissolve tool will combine all polygons into a single multipolygon feature. You can use the multipart to singleparts tool to split non-adjacent polygons into single-part features.
  • Attributes will be lost. After running multipart to singlepart, You can use the join attributes by location tool to add the original attributes back to the polygons.

    1. Merge Selected Features tool (Advanced Digitizing toolbar).

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  • Select two or more adjacent polygons. Click the merge selected features button. Choose what happens to the original attributes (eg, you can concatenate text strings, perform mathematical functions on numerical values, or manually enter a specific value).
  • The downside with this method is that you have to handle each group of polygons separately, so it takes longer than the dissolve method.

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