Abstract: The development of the image-based normalization technique used for Landsat Thematic Mapper/Enhanced Thematic Mapper Plus imagery is reviewed.The techniques perform radiometric calibration by converting the digital number of the Landsat imagery to at-satellite radiance and then to at-satellite reflectance using data normalization method.The validation case in this study shows that the illumination difference between the tested multitemporal Landsat TM images can be considerably reduced to one-third of that of the original DN-based image through the normalization technique.