Centre de documentation
scientifique

Dépouillements

Detection of forest decline using Ikonos sensor for cork oak (Quercus suber l.) woods in south Spain / F. Cano in Geocarto international, vol 21 n° 3 (September - November 2006)  

Public [article]  inGeocarto international > vol 21 n° 3 (September - November 2006) . - pp 13 - 18 Titre : Detection of forest decline using Ikonos sensor for cork oak (Quercus suber l.) woods in south Spain Type de document : Article/Communication Auteurs : F. Cano, Auteur ; R.M. Navarro Cerrillo, Auteur ; A. Garcia Ferrer, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 13 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande infrarouge [Termes IGN] bande rouge [Termes IGN] climat méditerranéen [Termes IGN] déboisement [Termes IGN] défoliation [Termes IGN] Espagne [Termes IGN] forêt méditerranéenne [Termes IGN] image Ikonos [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] Quercus (genre) [Termes IGN] sylviculture Résumé : (Auteur) Assessment afforest decline is severely hampered by the limited information on tree death on short temporal and broad spatial scales. In order to evaluate forest decline rates in cork oak of Southern Spain, an analysis was made of statistical correlation between the 4 IKONOS sensor original bands acquired in 2000, the Normalized Difference Vegetation Index (NDVI) and Infrared/Red Index (IR/R) and defoliation information obtained from the ground study. IKONOS near infrared band was negative correlated with defoliation (Pearson Correlation -0,762). The correlation between defoliation and IR/R ratio (Pearson Correlation -0,506) and NDVI (Pearson Correlation -0.449) was also significantly correlated. The dispersion of data presents in each category of defoliation justifies the use of the median value as the representative variable value for each intervals of defoliation. The Statistical Index of Defoliation (SID), generated from a lineal combination of IKONOS sensor bands, shows a correlation rate of 0.85 with the deforestation ground estimate. This study shows that high-spatial-resolution satellite data can now be used to measure forest decline processes, suggesting many new alternatives to evaluate the impact afforest decline in Mediterranean forests. Copyright Geocarto international Numéro de notice : A2006-476 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040608542388 Date de publication en ligne : 04/01/2008 En ligne : https://doi.org/10.1080/10106040608542388 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28200 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Very large scale aerial photography for rangeland monitoring / D.T. Booth in Geocarto international, vol 21 n° 3 (September - November 2006)  

Public [article]  inGeocarto international > vol 21 n° 3 (September - November 2006) . - pp 27 - 34 Titre : Very large scale aerial photography for rangeland monitoring Type de document : Article/Communication Auteurs : D.T. Booth, Auteur ; S.E. Cox, Auteur Année de publication : 2006 Article en page(s) : pp 27 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] altimètre laser [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] détecteur CMOS [Termes IGN] pas d'échantillonnage au sol [Termes IGN] photographie à grande échelle [Termes IGN] photographie aérienne [Termes IGN] récepteur GPS [Termes IGN] surveillance de la végétation [Termes IGN] Wyoming (Etats-Unis) Résumé : (Auteur) Ecological assessment of ground cover by conventional on-the-ground point sampling is labor intensive, expensive, and biased by access. Historically, motion blur has prevented high-resolution aerial photography from being used for ground cover measurements. To reduce motion blur we used a fixed-wing, 225-kg (empty weight) airplane flown at 72 km/hr ground speed 100 in above ground level with both a modified Hulcher 70 mm camera (500mm lens, Kodak Aerocolor HS SO-846 film, 1/4,000-second shutter speed), and a Canon 11. 1 mega-pixel, automatic, digital single lens reflex, color camera (420 mm focal-length lens). The resulting very-large scale aerial (VLSA) photography had resolutions of 5.0 and 2.1 mm GSD (Ground Sample Distance) for the scanned film and digital-camera images, respectively. Motion blur was minimal. The cost for obtaining 450 VLSA photographs over a 70,800-ha watershed was $0.07 ha. We found our methods well adapted for extensive aerial surveys to monitor the ecological condition of rangeland watersheds. Copyright Geocarto international Numéro de notice : A2006-477 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040608542390 Date de publication en ligne : 04/01/2008 En ligne : https://doi.org/10.1080/10106040608542390 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28201 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible