idw

Introduction If you want to predict the amount of rainfall, yield crops, or other attribute , you may need to learn about the interpolation methods like inverse distance weighted (IDW). IDW is a deterministic method for interpolation, once you have a set of know points, you can use IDW to estimate values for unknown points. For instance, you have 6 know points with rainfall attribute, and you need to predict the rainfall for a 7th point (Figure 1).