E. Torrecilla

Publications of E. Torrecilla

• Stray-light correction of in-water array spectroradiometers. Effects on underwater optical measurements

  Authors: E. Torrecilla, S. Pons, M. Vilaseca, J. Piera, J. Pujol

  OCEANS 2008; 10/2008

  Two miniature hyperspectral sensors are being considered to become part of a marine observatory system. The effect of stray-light radiation on its response is discussed in this article. A new methodTwo miniature hyperspectral sensors are being considered to become part of a marine observatory system. The effect of stray-light radiation on its response is discussed in this article. A new method to correct the unwanted spectral stray-light radiation has been developed and applied to both hyperspectral sensors. The correction method has been proved as effective for both considered miniature spectrographs using different calibration light sources. Furthermore, preliminary results of spectral stray-light corrections applied to underwater light field measurements point out that spectral stray-light correction plays an important role in accurate underwater optical hyperspectral measurements and its later spectral analysis.

• Effect of spectral resolution in hyperspectral data analysis

  Authors: E. Torrecilla, I.F. Aymerich, S. Pons, J. Piera

  Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. IEEE International; 08/2007

  The effect of hyperspectral data resolution on the results obtained using derivative spectroscopy is discussed in this article. A comparison was made between attenuation spectra measured using twoThe effect of hyperspectral data resolution on the results obtained using derivative spectroscopy is discussed in this article. A comparison was made between attenuation spectra measured using two different hyperspectral sensors with 3648 and 256 spectral bands, respectively. Smoothing and derivative algorithms were applied to both types of spectral data in order to assess qualitative information from the spectral features of several laboratory samples. In order to make an optimal application of the derivative analysis, a suitable selection of the smoothing and derivating parameters was done according to the resolution of each type of hyperspectral data. Second derivative spectra were obtained and peaks related to the absorption bands of pigments present in the considered samples were identified in both cases. Furthermore, interpolation techniques were applied so as to match spectral resolutions of data collected by the two sensors and negligible variations in the positions of the peaks were achieved in the derivative spectra.

• Monolithic spectrometer for environmental monitoring applications

  Authors: S. Pons, I.F. Aymerich, E. Torrecilla, J. Piera

  OCEANS 2007 - Europe; 07/2007

  Hyperspectral data analysis has been shown to be a reliable technique to identify several water components. Currently, there are numerous commercially available miniature spectrometer systems as wellHyperspectral data analysis has been shown to be a reliable technique to identify several water components. Currently, there are numerous commercially available miniature spectrometer systems as well as discrete components that are used by researchers in designing their own systems. We have developed a custom-designed hyperspectral sensor. Experimental results and potential applications are discussed on this article. It can be used as a low cost optical monitoring system to be employed on fish farming and aquaculture facilities.

• Monolithic spectrometer for environmental monitoring applications

  Authors: S. Pons, IF Aymerich, E. Torrecilla, J. Piera

  OCEANS 2007-Europe. 01/2007;

• Effect of spectral resolution in hyperspectral data analysis

  Authors: E. Torrecilla, I.F. Aymerich, S. Pons, J. Piera

  01/2007

  The effect of hyperspectral data resolution on the results obtained using derivative spectroscopy is discussed in this article. A comparison was made between attenuation spectra measured using twoThe effect of hyperspectral data resolution on the results obtained using derivative spectroscopy is discussed in this article. A comparison was made between attenuation spectra measured using two different hyperspectral sensors with 3648 and 256 spectral bands, respectively. Smoothing and derivative algorithms were applied to both types of spectral data in order to assess qualitative information from the spectral features of several laboratory samples. In order to make an optimal application of the derivative analysis, a suitable selection of the smoothing and derivating parameters was done according to the resolution of each type of hyperspectral data. Second derivative spectra were obtained and peaks related to the absorption bands of pigments present in the considered samples were identified in both cases. Furthermore, interpolation techniques were applied so as to match spectral resolutions of data collected by the two sensors and negligible variations in the positions of the peaks were achieved i

• Comparative response of two different hyperspectral sensors. Application to derivative analysis of absorption spectra

  Authors: E. Torrecilla, S. Pons, I.F. Aymerich, J. Piera

  Instrumentation ViewPoint. 01/2007; 6:86--87.

• Low cost hyperspectral device suitable for monitoring sensor networks

  Authors: S. Pons, I.F. Aymerich, E. Torrecilla, J. Piera

  Instrumentation ViewPoint. 01/2007; 6:60--61.

• Turbulent oceanic flow characterization derived from high-resolution CTD data processing

  Authors: R. Quesada, J. Piera, I. Fernández, E. Torrecilla, S. Pons

  Instrumentation ViewPoint. 01/2005; 4:31--32.

• An instrumentation project for studying the effects of turbulence in aquatic systems

  Authors: J. Piera, R. Quesada, E. Torrecilla, I. Fernández, S. Pons

  Instrumentation ViewPoint. 01/2005; 4:30--31.

• Characterization of the water optical properties using hyperspectral sensors

  Authors: E. Torrecilla, J. Piera, R. Quesada, I. Fernández, S. Pons

  Instrumentation ViewPoint. 01/2005; 4:48--49.

• Identification of phytoplankton pigment assemblages using derivative spectroscopy of hyperspectral remote-sensing reflectances

  Authors: E. Torrecilla, J. Piera, D. Stramski, R. Reynolds, E. Millán-Nuñez

  Instrumentation ViewPoint, ISSN 1886-4864, Nº. 8, 2009.

  One of the major challenges of ocean color research is distinguishing phytoplankton groups from in situ, airborne and satellite measurements to better understand diversity of phytoplankton and someOne of the major challenges of ocean color research is distinguishing phytoplankton groups from in situ, airborne and satellite measurements to better understand diversity of phytoplankton and some involved biochemical processes. In this framework, high spectral resolution measurements of the remote-sensing reflectance, hyperspectral Rrs(ë), can potentially yield more information about the presence of diverse phytoplankton groups than can be gleaned from traditional analyses of single band-ratios at discrete wavelengths (i.e. multispectral approaches). We introduce and discuss the feasibility of performing derivative spectroscopy and cluster analysis of hyperspectral Rrs(ë) to improve the automatic identification of phytoplankton populations in open ocean waters.

• Characterization of the water optical properties using hyperspectral

  Authors: E. Torrecilla, Jaume Piera Fernández, Rubén Quesada López, I. Fernández, S. Pons

• Turbulent oceanic flow characterization derived from high-resolution

  Authors: Rubén Quesada López, Jaume Piera Fernández, I. Fernández, E. Torrecilla, S. Pons

• SAMPLER: An instrumentation project for studying the effect of turbulence in aquatic systems

  Authors: J. Piera, R. Quesada, E. Torrecilla, I. Fernández, S. Pons

  Instrumentation ViewPoint, ISSN 1886-4864, Nº. 4, 2005, pag. 14.