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We present the main steps that will be taken to extract H$\alpha$ emissionflux from Javalambre Photometric Local Universe Survey (J-PLUS) photometricdata. For galaxies with $z\lesssim0.015$, the H$\alpha$+[NII] emission iscovered by the J-PLUS narrow-band filter $F660$. We explore three differentmethods to extract the H$\alpha$ + [NII] flux from J-PLUS photometric data: acombination of a broad-band and a narrow-band filter ($r'$ and $F660$), twobroad-band and a narrow-band one ($r'$, $i'$ and $F660$), and a SED-fittingbased method using 8 photometric points. To test these methodologies, wesimulated J-PLUS data from a sample of 7511 SDSS spectra with measuredH$\alpha$ flux. Based on the same sample, we derive two empirical relations tocorrect the derived H$\alpha$+[NII] flux from dust extinction and [NII]contamination. We find that the only unbiased method is the SED fitting basedone. The combination of two filters underestimates the measurements of theH$\alpha$ + [NII] flux by a 28%, while the three filters method by a 9%. Westudy the error budget of the SED-fitting based method and find that, inaddition to the photometric error, our measurements have a systematicuncertainty of a 4.3%. Several sources contribute to this uncertainty:differences between our measurement procedure and the one used to derive thespectroscopic values, the use of simple stellar populations as templates, andthe intrinsic errors of the spectra, which were not taken into account. Apartfrom that, the empirical corrections for dust extinction and [NII]contamination add an extra uncertainty of 14%. Given the J-PLUS photometricsystem, the best methodology to extract H$\alpha$ + [NII] flux is theSED-fitting based one. Using this method, we are able to recover reliableH$\alpha$ fluxes for thousands of nearby galaxies in a robust and homogeneousway.

Extracting H$\alpha$ flux from photometric data in the J-PLUS survey