Lab 7 Interpolation

Normal and season total rainfall levels were gathered from 50 precipitation stations scattered across southern California. I created an excel sheet to categorize the data into latitude and longitudinal points and manually selected specific water stations.
Using this data, we can see using both IDW and Spline in interpolation that a majority of precipitation occurs in the highlands and mountain regions but the Los Angeles Basin is usually dry and represents drought and arid conditions.
I believe the Spline technique is more useful because it gave more realisitc values for precipitation. IDW didn't give me any negative values but this is unrealistic because it is possible to have negative precipitation when it has not rained for several consecutive years resulting in drought conditions.