It separates noise from the signal and condenses much of the spectral information into a few bands that may then be used to create a color composite. Vegetation Suppression EarthSat has developed an algorithm that effectively removes the spectral characteristics of vegetation and reveals the lithology below. Decorrelation A decorrelation stretch is a method used to increase the range and diversity of colors within any color image. It is a simple and effective way of improving the visual distinction of an otherwise bland image. It is similar in principle to the minimum noise fraction, except that the user can interactively see and adjust the results to attain the best spectral enhancement.
Satellite imagery is nothing more than a grid of numbers.
In order to know where the image lays on the surface of the Earth, we must geocode the image. This may be done a number of ways, each with its advantages and shortcomings. The accuracy in this case is dependent upon the accuracy of the geocoded image and the quality of the tie points. 50 meters, is frequently used as a consistent, globally available map base. Projections and Datums Supported Geocoded images may then be placed into any projection and datum desired.