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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.
Definition. Zero-volatility spread. A tool used in the analysis of an asset swap that uses the zero-coupon yield curve to calculate the spread.The Z-spread is the number of basis points that would have to be added to the spot yield curve so that the bond's discounted cash flows equal the bond's present value.Each cash flow is discounted using its maturity and the spot rate for that maturity term, so each cash flow has its own zero-coupon rate.he Z-spread is the number of basis points that would have to be added to the spot yield curve so that the bond's discounted cash flows equal the bond's present value. Each cash flow is discounted using its maturity and the spot rate for that maturity term, so each cash flow has its own zero-coupon rate.