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I am trying to create contour plot concentration data to a map. I followded this link and have interpolated the data as follows: enter image description here

but, while forming contour lines, I am not finding the raster> Extraction> Interpolation I tried finding it in plugin but, I don't seem to find it there. What is the error I am making? enter image description here

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    Are you working in QGIS 2.18? You may as well check the Plugins Manager too see if GdalTools has been ticked.
    – Kazuhito
    Commented Jan 26, 2019 at 13:18
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    it was just a guess, but I'm glad it worked.
    – Kazuhito
    Commented Jan 26, 2019 at 14:41

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It is relatively rare, but sometimes we encounter a situation GdalTools plugin is not activated.

enter image description here

In an extreme case like below, we miss lots of raster tools.

enter image description here

In your case, the Plugin Manager will have below tools activated:

  • Heatmap
  • Interpolotaion plugin
  • Raster Terrain Analysis
  • Zonal statistics

But probably the GdalTools plugin is unchecked. Ticking it on will solve the issue.

NB. This issue is QGIS 2.18 specific.

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