The most powerful survey of the next decade to derive the desired precision galaxy distributions is the large-area multi-filter survey J-PAS, which is the culmination of multi-filter medium and narrow-band surveys. They are a different flavour of survey, half-way between photometry and spectroscopy, that provide low resolution photo-spectra of every observed pixel. Multi-filter surveys were initiated by COMBO-17, and followed by COSMOS-20, MUSYC, ALHAMBRA, SHARDS, and PAU. With 56 contiguous narrow-band filter (~145Å) observations over 8500deg² of the northern sky, J-PAS will provide R ~ 50 photo-spectra of about 200.000.000 galaxies with r < 22.5, leading to a photometric redshift precision of ~1000 km/s, and allowing emission line and stellar continuum measurements.

The PROFUSE project is developing analysis techniques to deal with luminosity/mass functions, emission lines and stellar populations, the environment, and the AGN activity from the local Universe to the high redshift regime at z > 2 using the multi-filter surveys ALHAMBRA, J-PLUS, and J-PAS.

ALHAMBRA-survey is a photometric survey. The survey covers a total area of 4 square degress in the sky distributed in 8 different fields (with half a degree per field) with 20 contiguous, equal width, medium band photometric filters from 3500 Å to 9700 Å, plus the standard broad bands JHKs in the Near Infrared.

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Javalambre Physics of the Accelerating Universe Astrophysical Survey, J-PAS, is an unprecedented photometric sky survey of 8500 deg2 visible from Javalambre in 54 narrow and 2 intermediate photometric bands covering the entire optical spectrum in combination with 3 broad photometric bands. The 2.5m mirror of the JST250 telescope, combined with a 1.2 Giga-pixel camera containing an array of 14 CCDs, will produce high-quality images and a unique spectral resolution over the whole area of the survey, casting a new picture of the cosmos.

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The Javalambre-Photometric Local Universe Survey, J-PLUS, is an unprecedented photometric sky survey of 8500 deg2 visible from Javalambre, using a set of 12 broad, intermediate and narrow band filters. J-PLUS will be a powerful 3D view of the nearby Universe that will observe and characterize tens of millions of galaxies and stars of the Milky Way halo, with a wide range of Astrophysical applications.

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