1 INTRODUCTION  
2 IMAGING AND PHOTOMETRY  
2.1 ELG footprint over the SGC and the NGC  
2.2 Imaging observations  
2.3 Data processing and photometry  
3 TARGET SELECTION ALGORITHM  
4 SYSTEMATICS  
4.1 Dependency over the observational parameters  
4.2 Modelling the systematic effects  
4.3 Zero-point fluctuations  
4.4 Catalog public release  
5 FIRST MONTHS OF OBSERVATIONS  
5.1 Tiling, plate design, and exposure time  
5.2 z spec reliability  
5.3 Redshift distribution and selection efficiency  
5.4 Cosmological forecast  
6 MEAN PROPERTIES OF THE ELGS OBSERVED IN THE SGC  
6.1 Spectral properties from stacked spectra  
6.2 Structural properties from the CS82 imaging  
6.3 Stellar masses  
6.4 Properties overview  
7 CONCLUSION