Is it elevation data or lab results? To do interpolation you need XYZ values. XY for the Lat. and Long. respectively while Z is the measured value you will used to do the interpolation. For the 80 points you have, tabulate them such that each point correspond with its XYZ values. Please watch this video for simpler explanation and guide ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-433OrcB6yhM.html
