Using one TIN image to adjust another is referred to as image calibration. Typically this methodology is used to adjust a radar TIN using a rainfall TIN as the control grid.
This is typically done because radar TINs have very good spatial resolution but lack precision, whereas rainfall TINs are precise at the gage locations but lack the spatial resolution of the radar. The best features of each TIN type are combined in the hope that it will result in a better final product.
For example, if a radar grid cell indicates that the heavier rainfall in one grid cell than another then there is a good chance this is correct if the grid cells are somewhat close to each other. This can be greatly affected by anomalous propagation, orographic effects, cold fronts, hail, and many other factors. Given all this, calibrating radar can still significantly improve results.
