Rainfall Estimation By Using Thiessen Polygons, Inverse Distance Weighted, Spline, And Kriging Methods : A Case Study in Pontianak, West Kalimantan

Abstract

There are four methods for estimating rainfall in a region with GIS; they are Thiessen polygons, Inverse Distance Weighted (IDW), Spline, and Kriging. Each has its own advantages and disadvantages. The selection of these four methods must be adjusted with the appropriation of the rainfall data. This article will show the advantages and disadvantages of the four methods for the study area of Pontianak, West Kalimantan, Indonesia.