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Systematic corrections of AVHRR image composites for temporal studies / J. Cihlar in Remote sensing of environment, vol 89 n° 2 (30/01/2004)  

Public [article]  inRemote sensing of environment > vol 89 n° 2 (30/01/2004) . - pp 217 - 233 Titre : Systematic corrections of AVHRR image composites for temporal studies Type de document : Article/Communication Auteurs : J. Cihlar, Auteur ; R. Latifovic, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 217 - 233 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] correction d'image [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] image en couleur composée [Termes IGN] image Landsat-TM [Termes IGN] image NOAA-AVHRR [Termes IGN] réflectance végétale Résumé : (Auteur) For quantitative studies of vegetation dynamics, satellite data need to be corrected for spurious effects. In this study, we have applied several changes to an earlier advanced very high resolution radiometer (AVHRR) processing methodology (ABC3; [Remote Sens. Environ. 60 (1997) 35; J. Geophys. Res.Atmos, 102 (1997) 29625; Can. J. Remote Sens. 23 (1997) 163]), to better represent the various physical processes causing contamination of the AVHRR measurements. These included published recent estimates of the NOAA-11 and NOAA-14 AVHRR calibration trajectories for channels 1 and 2; the best available estimates for the water vapour, aerosol and ozone amounts at the time of AVHRR data acquisition; an improved bidirectional reflectance algorithm that also takes into consideration surface topography; and an improved image screening algorithm for contaminated pixels. Unlike the previous study that compared the composite images to a single-date AVHRR image, we employed coincident TM images to approximate the AVHRR pixel field of view during the data acquisition. Compared to ABC3, the modified procedure ABOV2 was found to improve the accuracy of AVHRR pixel reflectance estimates, both in the sensitivity (slope) of the regression and in r2. The improvements were especially significant in AVHRR channel 1. In comparison with reference values derived from two full TM scenes, the corrected AVHRR surface reflectance estimates had average standard errors values of + 0.009 for AVHRR C1, + 0.019 for C2, and + 0.04 for NDVI; the corresponding r2 values were 0.55, 0.80, and 0.50, respectively. The changes in ABC3V2 were not able to completely remove interannual variability for land cover types with little or no vegetation cover, which would be expected to remain stable over time, and they increased the interannual variability of mixed forest and grassland. These results are attributed to a combination of increased sensitivity to interannual dynamics on one hand, and the inability to remove all sources of noise for barren or sparsely vegetated northern land cover types on the other. Numéro de notice : A2004-025 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2002.06.007 En ligne : https://doi.org/10.1016/j.rse.2002.06.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26553 [article]

A comparison of BRDF models for the normalization of satellite optical data to a standard sun-target-sensor geometry / R. Latifovic in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1889 - 1898 Titre : A comparison of BRDF models for the normalization of satellite optical data to a standard sun-target-sensor geometry Type de document : Article/Communication Auteurs : R. Latifovic, Auteur ; J. Cihlar, Auteur ; J. Chen, Auteur Année de publication : 2003 Article en page(s) : pp 1889 - 1898 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] changement climatique [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] éclairement lumineux [Termes IGN] image NOAA-AVHRR [Termes IGN] image optique [Termes IGN] image SPOT-Végétation [Termes IGN] rayonnement solaire [Termes IGN] réflectance de surface [Termes IGN] tâche claire Résumé : (Auteur) Climate change studies require consistent, long time series, surface reflectance data. The characterization of the bidirectional reflectance distribution function (BRDF) is important for normalizing the solar radiation reflected from the earth's surface. We evaluated four BRDF models to identify the preferred approach to the normalization of multiyear National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (AVHRR) and SPOT4VEGETATION (VGT) composite images to a common illumination and viewing geometry. Four models by the following authors were included: Walthall, Ropjean, Ross-Li, and a new nonlinear temporal angular model (NTAM). NTAM accounts for hotspot effects and also responds to seasonal changes in land cover properties (using vegetation indexes as surrogate temporal measures). We compared the performance of the models under different scenarios of coefficient derivation and model application including model ability to reproduce theoretical BRDF curves, model consistency in single, multiyear, and incomplete sampling schemes, and comparison of AVMR and LANDSAT Thematic Mapper surface reflectance prior and after BRDF normalization. We found that in all the tests, NTAM yielded the best fits between the observed and estimated values. NTAM requires eight coefficients and a lengthier iterative procedure to derive the coefficients, but the resulting coefficients are applied to the entire growing season rather than one temporal window. NTAM also performed well for different sensors (AVHRR, VGT) and geographic areas (Canada, east Asia, southern United States). Our results contradict the often-encountered perception that semiempirical BRDF models for angular normalization are all similarly effective, and the research on this topic is mature. We also describe a procedure for routine normalization of satellite optical data. For northern ecosystems, the NTAM coefficients derived from AVHRR and VGT data for Canada are available via ftp://Ccrs.nrcan.gc.ca. Numéro de notice : A2003-280 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.811557 En ligne : https://doi.org/10.1109/TGRS.2003.811557 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22575 [article]

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Radiometric correction of visible and infrared remote sensing data of the Canada centre for remote sensing / F.J. Ahern in International Journal of Remote Sensing IJRS, vol 8 n° 9 (September 1987)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 8 n° 9 (September 1987) . - pp 1349 - 1376 Titre : Radiometric correction of visible and infrared remote sensing data of the Canada centre for remote sensing Type de document : Article/Communication Auteurs : F.J. Ahern, Auteur ; R.J. Brown, Auteur ; J. Cihlar, Auteur ; R. Gauthier, Auteur ; J. Murphy, Auteur Année de publication : 1987 Article en page(s) : pp 1349 - 1376 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] Canada [Termes IGN] correction radiométrique [Termes IGN] étalonnage radiométrique [Termes IGN] image Landsat-MSS [Termes IGN] image Landsat-TM [Termes IGN] image SPOT-HRV [Termes IGN] réflectance [Termes IGN] révision Numéro de notice : A1987-584 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168708954779 En ligne : https://doi.org/10.1080/01431168708954779 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24576 [article]

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Procedures for the description of agricultural crops and soils in optical and microwave remote sensing studies / J. Cihlar in International Journal of Remote Sensing IJRS, vol 8 n° 3 (March 1987)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 8 n° 3 (March 1987) . - pp 427 - 439 Titre : Procedures for the description of agricultural crops and soils in optical and microwave remote sensing studies Type de document : Article/Communication Auteurs : J. Cihlar, Auteur ; M.C. Dobson, Auteur ; T. Schmugge, Auteur ; F. Baret, Auteur ; Gérard Guyot, Auteur Année de publication : 1987 Article en page(s) : pp 427 - 439 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] cultures [Termes IGN] image optique [Termes IGN] image radar [Termes IGN] parcelle agricole [Termes IGN] surface cultivée Numéro de notice : A1987-580 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168708948651 En ligne : https://doi.org/10.1080/01431168708948651 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24573 [article]

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