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Universal Kriging can be seen as a point interpolation, which requires a point map as input and which returns a raster map with estimations and optionally an error map. Universal Kriging is a variant of the Ordinary Kriging operation: Universal Kriging is Kriging with a local trend. The local trend or drift is a continuous and slowly varying trend surface on top of which the variation to be interpolated is superimposed.
Are You in an Upward or Downward Trend? Defining an Upward Trend. When a series forms that consists of two rising highs and two rising lows, it defines the uptrend. In the chart above, we see three rising lows and four rising highs, which is a very clear upward movement. Notice that the fifth high is lower than the fourth.