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The INT Galactic Plane Survey (IGAPS) is the merger of the opticalphotometric surveys, IPHAS and UVEX, based on data from the Isaac NewtonTelescope (INT) obtained between 2003 and 2018. These capture the entirenorthern Galactic plane within the Galactic coordinate range, -5<b<+5 deg. and30<l<215 deg. From the beginning, the incorporation of narrowband H-alphaimaging has been a unique and distinctive feature of this effort. Alongside afocused discussion of the nature and application of the H-alpha data, wepresent the IGAPS world-accessible database of images for all 5 survey filters,i, r, g, U-RGO and narrowband H-alpha, observed on a pixel scale of 0.33 arcsecand at an effective (median) angular resolution of 1.1 to 1.3 arcsec. Thebackground, noise, and sensitivity characteristics of the narrowband H-alphafilter images are outlined. Typical noise levels in this band correspond to asurface brightness at full one-arcsec resolution of around 2e-16erg/cm2/s/arcsec2. Illustrative applications of the H-alpha data to planetarynebulae and Herbig-Haro objects are outlined and, as part of a discussion ofmosaicking technique, we present a very large background-subtracted narrowbandmosaic of the supernova remnant, Simeis 147. Finally we lay out a method thatexploits the database via an automated selection of bright ionized diffuseinterstellar emission targets for the coming generation of wide-fieldmassive-multiplex spectrographs. Two examples of the diffuse H-alpha mapsoutput from this selection process are presented and compared with previouslypublished data.

High resolution H-alpha imaging of the Northern Galactic Plane, and the IGAPS images database