Each satellite instrument has limited sensitivity in terms of GW vertical and horizontal wavelengths. The dashed lines denote the shortest truncation scale that can be achieved with nominal instrument operation. The lower horizontal wavelength cutoffs reflect the shortest of along-LOS and cross-LOS resolutions associated with sampling of each instrument, which depends on FOV smearing and sampling. The dotted lines represent the GW dispersion relation for each constant phase speed. The cycles with uncertainties denote GW power distributions hypothesized for convective and orographic sources. More details on gravity wave remote sensing and imaging can be found in Wu et al. (ASR, 2006) and Eckermann and Wu (ACDP, 2006).