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Is it possible to create contour lines based on part of the points and not the entire dataset?

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Export the points to a new shapefile or have them selected while running the function (the latter might only work in Arcgis, not sure on Qgis) –  Martin Jan 16 at 14:53
    
@martin, thanks. I copied part of the sata to a new layer and tried creating contours, but it did't work. It's a very very small area (few sq. meters) and very large differences (several 100s) between the value of each point (being the concentration of a contaminenet). Is it possible to draw by hand a line between the point? –  H.Wiener Jan 19 at 8:57
    
Of course it's possible, but if there's such a big change in a short distance it might be hard to visualize with contour lines. I would recommend that you rasterize the values using some interpolation method instead. –  Martin Jan 19 at 11:17

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