def imagearm(sdmfile, scan, segment, npix=512, res=50, **kwargs):
    """ Function to do end-to-end 1d, arm-based imaging """

    import sdmpy
    sdm = sdmpy.SDM(sdmfile)
    ants = {ant.stationId:ant.name for ant in sdm['Antenna']}
    stations = {st.stationId: st.name for st in sdm['Station'] if 'X' not in str(st.name)}
    west = [int(str(ants[st]).lstrip('ea')) for st in stations if 'W' in str(stations[st])]
    east = [int(str(ants[st]).lstrip('ea')) for st in stations if 'E' in str(stations[st])]
    north = [int(str(ants[st]).lstrip('ea')) for st in stations if 'N' in str(stations[st])]

    d = set_pipeline(sdmfile, scan, **kwargs)
    blarr = rtlib.calc_blarr(d)
    selwest = [i for i in range(len(blarr)) if all([b in west for b in blarr[i]])]
    seleast = [i for i in range(len(blarr)) if all([b in east for b in blarr[i]])]
    selnorth = [i for i in range(len(blarr)) if all([b in north for b in blarr[i]])]

    u,v,w = ps.get_uvw_segment(d, segment=segment)
    data = pipeline_reproduce(d, segment=segment, product='data')
    dataw = data[:,selwest].mean(axis=3).mean(axis=2)
    datae = data[:,seleast].mean(axis=3).mean(axis=2)
    datan = data[:,selnorth].mean(axis=3).mean(axis=2)
    uw = u[selwest]
    ue = u[seleast]
    un = u[selnorth]
    vw = v[selwest]
    ve = v[seleast]
    vn = v[selnorth]

    grid = n.zeros((len(data), npix), dtype='complex64')
    grid2 = n.zeros((len(data), npix), dtype='float32')
    datalist = []
    for (uu, vv, dd) in [(uw, vw, dataw), (ue, ve, datae), (un, vn, datan)]:
#        uu = n.round(uu/res).astype(int)
#        vv = n.round(vv/res).astype(int)
        uu = n.mod(uu/res, npix)
        vv = n.mod(vv/res, npix)
        uv = n.sqrt(uu**2 + vv**2)
        uv = n.round(uv).astype(int)
        for i in range(len(uv)):
            if uv[i] < 512:
                grid[:, uv[i]] = dd[:, i]
        grid2 = n.fft.ifft(grid, axis=1).real
        datalist.append(grid2)

    return datalist