A number of UkrVO development primordial projects in the frame of its conception was defined and among them there is a creation of Joint Digital Archive (JDA) of data, storaged on different carriers in Ukrainian observatories. They are a) photographic observations of celestial objects in 1898-1990; b) CCD observations of celestial objects since 1990-th, c)spectral observations (including glass archives) in optical, UF, radio and gamma ranges since 1940-th. Most of them are now presented as Local Data Archives (LDA) with different level of systematization. Most of LDA has no online access.

The most important resource of JDA is archives of astronegatives, i.e. glass libraries. Astronomical observatory of Odessa National University (AO ONU) and MAO NAS of Ukraine (Golosiiv archive, GPA) are the owners of the greatest glass collections. AO ONU archive with 105 thousands of plates is the third in the world after Harvard and Zonnenberg archives and GPA includes more than 80 thousands of negatives. The unique observational collection is storaged in Crimean Astrophysical observatory (CrAO). The information capacity of this archive can be estimated only approximately - more than 60 appliances were used having been combined with more than 30 telescopes during 100 years of observations, which were carried out not only in in optical, but radio, UF and gamma ranges.

JDA of astronomical observations is created in order to join previously formatted in accordance with common input data standards LDA. The necessity of introducing such standards is conditioned by essential geterogeneity of observational data and the different level of LDA readiness for including into the JDA. Databases of JDA are to be integrated on the UkrVO site in the form of search interfaces and means of access to distributed servers of observatories - participants of UkrVO project where the LDA are physically located. The access to data from UkrVO site is to be opened according the LDA readiness and meeting the common standards. As JDA data are standartized then access to them can be realized through different interfaces and applications, developed in the specified observatories. In particular, as the test prototype of above said control mechanism joint data of MAO NASU and Mykolaiv observatory are available throuh search pages of both observatories.

Currently developed JDA informatic system is intended to include tools for UkrVo registry and joint/interconnected databases control and administration, user oriented search interfaces, online services for data analysis and processing, teaching software for VO tools application in scientific researches, the deployment of pan-Ukrainian infrastructure of observational data transmission into the internet, as well as means of itself development and other participants and scientific projects involving into the UkrVo activity.