I have a point shapefile concerning rainfall for the whole country. The points represent the annual rainfall in mm and range from 675-3562. I have approximately 800 points.
I am attempting to use Ordinary Kriging in QGIS to create a smooth raster surface.
I have used the Saga GIS ordinary kriging tool whith the following paramaters altered from the default:
Block Size: 1000 Cellsize: 1000
This has successfully created a smooth surface, however the range in values does not match my point data. The Ordinary kriging output has values ranging from 798-2273 - Why is this?