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So overall my map looks the same like what I draw in QGIS. The issue is that when I zoom in, in that case 54x then you can see ragged lines.

QGIS enter image description here

Browser enter image description here

That is not what I need. I need high details also by zooming in. So how can I improve that.

One thing I could do is simplyfying the topojson file. But that's not a solution because I need that high quality lines because my map is often used by zooming in.

Also I could smooth the lines a bit. But already tested and still looking bad.

So how can I also by zooming in show max details. How can I tell QGIS to give more details. Or is it something of the projection? I'm using this projection: +proj=eqc +a=190493.11 +lat_ts=0 +lon_0=0 +rf=800 +units=m +no_defs. But I don't think that I can change it without loosing all right?

  • What kind of data (vector or raster) do you use, and how do you display the QGIS output in your browser? – AndreJ Mar 1 '15 at 14:50
  • Well the picture from QGIS is a TIF picture. And there I draw a polygon on. Then I export as geojson all the different layers. And finally with topojson merging als geojson's to one topojson. Then I show it with D3. – kwoxer Mar 1 '15 at 16:22
  • Unfortunately nothing I work with. Could the edges come from a limited precision of your topojson coordinates, compared to those of QGIS layers? – AndreJ Mar 1 '15 at 17:15
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    Here you have a CRS with degrees as units (longlat) and an ellipsoid that makes sense. You can not simply call it meters on a half-sized planet if you hand it over to D3. Instead, you have to use Save as to another file and a different projection with meters as units. Then you get reasonable coordinates in meters. – AndreJ Mar 2 '15 at 10:21
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    Maybe you should reproject to meters first, then simplify. – AndreJ Mar 2 '15 at 11:13
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Like AndreJ described, I should resave all the layers to a better projection or whatever. But I don't know if this is resolving my issue as I wish. So I now use CSS strokes with some round lines like this:

 fill: #188;
 fill-opacity: 0.7;
 stroke-width: 0.3px;
 stroke: #188;
 stroke-linejoin: round;
 stroke-miterlimit: 2;

enter image description here

Yeah not the best or the correct lines but at least not ragged anymore.

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