I have many small polygons. How do I increase size of these polygons when zoomed out in QGIS? As seen in the image below, the symbol appears to be lost when I zoom out.

Notes: I have created a thematic layer on the polygons. All layers are vector layers from a database.

enter image description here

  • It would be a solution if the polygons could be converted into symbols/points themselves, which will always stay visible at any zoom level. (The only thing is I don't know how to do that... Should I post that question in a separate post?) – Rob Mar 31 '16 at 11:40
  • If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context. - From Review – MaryBeth Mar 31 '16 at 13:15

If you change the polygon style to have a wide outline/border, the polygons will stay visible even when you zoom out a lot. It's not very pretty but maybe it's enough for what you need. If not, please clarify which effect you are trying to achieve.

  • I wanted the sumbol to increase in size when zoomed out. I created thematic map but when I zoom out I am not able to see any color but only only black polygon as in figure. – kinkajou Sep 23 '13 at 17:26
  • black is the border color, right? – underdark Sep 23 '13 at 17:55
  • Have you tried turning off the border (border style = "no pen")? By using the new QGIS 2.0 "rule-based rendering", you could also make it more "dynamic", by creating multiple symbols (at various border widths) to be used at defined scales. ie- when zoomed in close use a thin border, but when zoomed out further, use no border. – RyanDalton Sep 23 '13 at 23:10
  • @underdark black is the outerborder. I want the polygon to appear bigger when zoomed out so that it won't disapper when I want to see overview. – kinkajou Sep 24 '13 at 1:02
  • @RyanDalton I made the border with no pen. Now I can see polygon that are blue or green. But at certain zoom level my polygon appears to be point which is not what I want. Is there anyway out? – kinkajou Sep 24 '13 at 1:04

Similar to RyanDalton's suggestion, try using rule-based symbols, with a simple fill when zoomed in, and a centroid fill when zoomed out.

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