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1
Content available remote Relating Hyperspectral Airborne Data to Ground Measurements in a Complex and Discontinuous Canopy
Calleja J. F., Hellmann Ch., Mendiguren G., Punalekar S., Peón J., MacArthur A., Alonso L.
Acta Geophysica
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2015
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Vol. 63, no. 6
1499--1515
EN
The work described in this paper is aimed at validating hyperspectral airborne reflectance data collected during the Regional Experiments For Land-atmosphere EXchanges (REFLEX) campaign. Ground reflectance data measured in a vineyard were compared with airborne reflectance data. A sampling strategy and subsequent ground data processing had to be devised so as to capture a representative spectral sample of this complex crop. A linear model between airborne and ground data was tried and statistically tested. Results reveal a sound correspondence between ground and airborne reflectance data (R2 > 0.97), validating the atmospheric correction of the latter.
2
Content available remote AHS and CASI Processing for the REFLEX Remote Sensing Campaign : Methods and Results
Miguel E. de, Jiménez M., Pérez I., Cámara Ó. G. de la, Muñoz F., Gómez-Sánchez J. A.
Acta Geophysica
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2015
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Vol. 63, no. 6
1485--1498
EN
The airborne spectroradiometers AHS and CASI were used as a source of hyperspectral and thermal remote sensing data during the REFLEX campaign. Data geolocation and a first simple atmospheric correction was performed by INTA in near-real time with a specific on-site setup and distributed to all campaign participants. In this paper we present briefly the AHS and CASI REFLEX flight campaign followed by a detailed description of the methodology used for image processing and finally the results obtained in terms of image quality. As a conclusion, near-real time processing for AHS and CASI level 1 geolocated products was successful as most of CASI level 2 results but further work is needed for achieving accurate AHS level 2 products.
3
Content available Preliminary acoustic research of diving Arctic birds
Szczucka J.
Hydroacoustics
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2008
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Vol. 11
365-368
EN
This paper aims to introduce the preliminary results of acoustic studies of the diving strategy of Arctic birds. It presents the inverted echosounding and noise measurements performed by Autonomous Hydroacoustic system (AHS) in Isfjorden (Spitsbergen). Both the echograms and the noise record have been analysed as far as the birds' diving is concerned.
4
Content available remote Zastosowanie sterowania liniowego w liniowych modelach teorii car-fallowing
Pordzik M.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2001
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z. 42
99-106
PL
W artykule przedstawiono model sterowania dla dwóch pojazdów znajdujących się pod automatyczną kontrolą. Zaproponowano własny model sterowania oparty na założeniach sterowania AHS (Automated Highway System), który został wykorzystany do zbudowania algorytmu sterowania. Utworzony model porównano z istniejącymi modelami car-following pod względem "śledzenia" przyspieszenia dla dwóch pojazdów.
EN
A model of control between two automated cars has been proposed in this paper. The proposed model based on AHS was tested and compared with available car-following models. Results of spacing, follow velocity and acceleration were illustrated in graphs.
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