A novel algorithmic system that works subtly in the background to mutual benefit, and adapts quickly to local conditions, ...

Jose M. Montero, Beatriz Larraz, Interpolation Methods for Geographical Data:, The Journal of Real Estate Research, Vol. 33, No. 2 (April–June 2011), pp. 233-244 ...

This paper discusses methods and software for C¹ interpolation at arbitrarily distributed data points in the plane. The primary results presented here are derivative-estimation procedures which lead ...

It's okay if there is missing data. In the Target field, enter the first data point in Column A and then select the Method of interpolation. You can go forward or backward if you are recreating data.