Narrowband-to-broadband conversion is a critical procedure for mapping land-surface broadband albedo using multi-spectral narrowband remote-sensing observations. Due to the significant difference in optical characteristics between soil and vegetation, NTB conversion is influenced by the variation in vegetation coverage on different surface types. To reduce this influence, this paper applies an ...

We assembled spectral image datacubes of Titan in H-band (1.4131.808 μm), using adaptive optics on the 10-m W.M. Keck telescope, by stepping a spectrometer slit across Titan’s disk. We constructed images of Titan at each wavelength by ‘glueing’ the spectra together, producing 1400ultra-narrowband (~0.1nm) views of the satellite. With this method one can characterise Titan’s atmosphere over the ...

Plant water stress has been extensively studied using hyperspectral visible- and near-infrared systems. Thermal imaging the recent availability of widely tunable infrared quantum cascade laser (QCL) allow us to propose an active system operating in mid-infrared (MIR) band, where output consists a series narrowband subimages arranged across reflectance spectrum sample, forming hypercube data acq...

We use deep narrowband Ca H&K ($F395N$) imaging taken with the Hubble Space Telescope (HST) to construct metallicity distribution function (MDF) of Local Group (LG) ultra-faint dwarf (UFD) galaxy Eridanus II (Eri II). When combined archival $F475W$ and $F814W$ data, we measure metallicities for 60 resolved red giant branch stars as faint $m_{F475W}\sim24$ mag, a factor $\sim4$x more than curren...

Stimulated Raman scattering (SRS) microscopy is a nonlinear optical technique for label-free chemical imaging. This analytical tool delivers maps at high speed, and spatial resolution of thin samples by directly interrogating their molecular vibrations. In its standard implementation, SRS narrowband forms images with only single vibrational frequency time. However, this approach not hinders the...

Traditional monopulse angle estimations are mainly based on phase comparison and amplitude comparison methods, which are commonly adopted in narrowband radars. In modern radar systems, wideband radars are becoming more and more important, while the angle estimation for wideband signals is little studied in previous works. As noise in wideband radars has larger bandwidth than narrowband radars, ...

We present narrowband Hα imaging data of a small survey of nearby edge-on spiral galaxies, aiming at the detection of ‘extraplanar’ diffuse ionized gas (DIG). A few of our studied edge–on spirals show signs of disk–halo interaction (DHI), where extended line emission far above the galactic plane of these galaxies is detected. In some cases an extraplanar diffuse ionized gas (eDIG) layer is disc...