We describe an imaging method that makes use of interference filters to provide integrated stellar spectral indices for spiral disks to faint surface brightness limits. We use filters with bandpasses ∼ 60Å FWHM, centered on the Mg and Fe features (λλ5176Å and 5270Å respectively) allowing the determination of the spatial distribution of the Lick indices Mg 2 and Fe5270. These two indices have be...

Biomass burning is a global phenomenon and systematic burned area mapping is of increasing importance for science and applications. With high spatial resolution and novelty in band design, the recently launched Sentinel-2A satellite provides a new opportunity for moderate spatial resolution burned area mapping. This study examines the performance of the Sentinel-2A Multi Spectral Instrument (MS...

With the help of the multiphase chemical evolution model (Mollá, Hardy & Beauchamps 1999) we have derived the evolutionary histories of the galaxies NGC 4303, NGC 4321 y NGC 4535. With these histories and an evolutionary synthesis model, we were able to reproduce their observed radial distributions of the spectral indices Mg2 and Fe5270. Chemical evolution models however may fit well the presen...

This research was conducted to assess the potential of hyperspectral indices to detect iron deficiency in capital-intensive multi-annual crop systems. A well-defined hyperspectral multi-layer dataset was constructed for a peach orchard in Zaragoza, Spain, consisting of hyperspectral measurements at various monitoring levels (leaf, crown, airborne). Trees were subjected to four different treatme...

Using our own observations at 45 MHz and data found in the literature after an exhaustive search, we have attempted a comprehensive study of the integrated flux density spectrum of the Centaurus A radio galaxy and of its large scale components. The spectrum for the whole object, between 10 and 4750 MHz, can be well represented by a power law with a spectral index of −0.70 ± 0.01, disproving the...

We present images of the SNR HB3 at both 408 MHz and 1420 MHz from the Canadian Galactic Plane Survey mainly based on data from the Synthesis Telescope of the Dominion Radio Astrophysical Observatory. We reproduce the 100m-Effelsberg HB3 image at 2695 MHz at large scale, and find that there exists a background emission gradient across the HB3 area. Based on our analysis of background emission a...

Novel and existing hyperspectral vegetation indices were evaluated in this study, with the aim of assessing their utility for accurate tracking of leaf spectral changes due to differences in biophysical indicators caused by apple scab. Novel indices were extracted from spectral profiles by means of narrow-waveband ratioing of all possible two-band combinations between 350 nm and 2500 nm at nano...

Wildland fires are a yearly recurring phenomenon in many terrestrial ecosystems. Accurate fire severity estimates are of paramount importance for modeling fire-induced trace gas emissions and rehabilitating post-fire landscapes. We used high spatial and high spectral resolution MODIS/ASTER (MASTER) airborne simulator data acquired over four 2007 southern California burns to evaluate the effecti...