Alternative Calibration Methods
We also evaluated other calibration methods for remote areas where ground observation data are scarce or
unavailable. These methods included using data from an adjacent scene or from a different time period for the same
scene to develop a regression relationship. Several preliminary studies were conducted to test the reliability of these
approaches using Landsat images from central and southern Minnesota. Scenes from the same path taken on the same day can use the model developed from an upper or lower scene as long as atmospheric conditions are similar.