Easy and efficient access to the data is key to the success of a large project like J-PLUS. Here we foresee a series of data releases (accessible to the members of the J-PLUS collaboration and, then, public) of both the combined images and the final database.
Data will be accessible via the “External Data Access Machine” (EDAM). This will host a web-portal which will give access to the data. Once the data are validated, on a periodic basis, they will be made accessible to the members of the collaboration. One year after the internal data release, the data become public and can be accessed by anyone. All data will be available via protocols of the Virtual Observatory. Images will be available via the “Simple Image Access Protocol” (SIAP). This will allow not only to search for all images covering a sky region but also to retrieve only image cutouts of the region a user is interested in. Catalogues will be accessible both via “Simple Cone Search” (SCS) and “Table Access Protocol” (TAP). SCS allows to search all the objects within a radius from a sky position. TAP allows more complex searches based on SQL.
The web-portal will provide a navigation system with a feeling similar to the one of SDSS, where the user will be allowed to browse through RGB images, select individual targets and get their measured properties. The web-portal also supports searches of lists of targets which deliver post-stamps, data and spectral energy distributions. Finally, the web-portal gives the possibility to perform searches to the database (using the TAP protocol above) with helpful examples and online help.
The J-PLUS First Data Release (July 2018) (J-PLUS-DR1) comprises 511 J-PLUS fields observed in 12 optical bands amounting to 1022deg2 (~900 deg2 after masking), with ~8.4 million objects at r < 21.