The importance of DSA (Distributive Solar Analogy) when modeling starspots from a photometric data is discussed. It's advantage over the other modeling techniques to confine the solution parameters, especially the spot latitudes are described. Unlike the other photometric techniques which tries to locate limited number of cool surface spots, DSA aims to model global distribution of all virtually existing spots.
EKER, ZEKİ (1999) "Photometric Imaging with Distributive Solar Analogy," Turkish Journal of Physics: Vol. 23: No. 2, Article 9. Available at: https://journals.tubitak.gov.tr/physics/vol23/iss2/9