International Journal of Engineering and Technology

The images obtained by remote sensing systems are not quite often sufficient for high precision applications due to various distortions. The distortions can be divided into three layers Geometric, Radiometric and Atmospheric distortions/Errors. The first layer deals with the steps to be carried out for correcting the Geometric distortions/errors through generic non-parametric models that relates remotely sennsed image to terrain coordinates. The second layer is dealt about the five methods used for Relative Radiometric Correction (RRC) such as Pseudo Invariant Features (PIF), Radiometric Control Set (RCS), Image Regression (IR), No-Change set determined from scatter grams (NC) and Histogram Matching (HM) and the third layer deals with an Atmospheric Correction which is to retrieve the surface reflectance from remotely sensed imagery by removing the atmospheric effects by using theoretical model called look-up table. A comparative study of the various mathematical techniques has been discussed in this paper for the betterment of preprocessing of satellite images.