3. Population and SampleFor land price mapping, the population was all the built up areas surrounding Porong arterial road. The amount of population was identified using digitizing feature on ArcGis 10.1, in total 9393 plot of land. Sampling method in this research is simple random sampling, because the majority of the population has similar characteristic, which is dominated by residential building and rice field. Simple random sampling is a sampling method in which each member of the subset has an equal probability of being chosen. The sample size was determined using Slovin’s formula.