Contour map populated data extraction

I have a few data from various location of a field that I use to plot contour map. I see that the plot is limited to available data location. I am interested to have bigger area to be covered so I have a few extra data points outside original area with โ€˜Noneโ€™ value. In the constructed map, I see that the calculated data is populated. I wonder how to extract the populated data.