for shadow analysis in pv systems the site survey is conducted by the team of engineers. there are two methods for shadow analysis; 1 Non photographic 2 photographic in non photographic method the tools are used for the visualization of shading across sun's path. in photographic methods, the proper panoramic images are developed and are converted into percentage loss of radiations and ultimately into digital files. the more precise way is to make a 3-D model of the site.