Interstellar Extinction from Large Surveys

Under some assumptions, information on interstellar extinction may be obtained from modern large photometric survey data. Virtual Observatory facilities allow users to make a fast and correct cross-identification of objects from various surveys. This process yields multicolor photometry data for registered objects and makes it possible to estimate color excesses and, with a few exceptions for some areas with high total-to-selective extinction ratio, calculate interstellar extinction. A 3D extinction map then can be constructed for almost the whole sky. The method is applied to an area with the low Galactic latitude, and the results are discussed in the present paper