I have a shapefile with 65 data points. Each data point has a value for NO2 pollution. I would like to use kriging to create a grid of NO2 pollution values for the whole area. I have tried using Processing> Toolbox> SAGA> Ordinary Kriging. The process runs OK and two new layers are created called Quality Measure and Prediction, but both these layers are invisible or show no information.

What I assume is the value range of the Prediction file seems to indicate that something has gone wrong. It shows that the value of the black shade is 1.79769e+308 and the value of white is -1.79769e+308.

Can anyone help?

screen grab of kriging results

  • I think I see similar output working in QGIS3.0.1. If it is also your case, can you update to 3.0.2? It fixed my case. – Kazuhito Apr 24 '18 at 12:55
  • I might try that. Not sure what else to do. The Ordinary Kriging process is now producing some visible output, but it's only in seemingly random patches. – Rick Lyons Apr 24 '18 at 14:53
  • Have you tried running the same process in the most recent long term release (2.18)? This would narrow down whether there's a bug in QGIS 3.0, or some problem with your data or method. – csk Apr 25 '18 at 19:15

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