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Assessing the relationship between ground measurements and object-based image analysis of land cover classes in Pinyon and Juniper Woodlands / April Hulet in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 9 (September 2013)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 79 n° 9 (September 2013) . - pp 799 - 808 Titre : Assessing the relationship between ground measurements and object-based image analysis of land cover classes in Pinyon and Juniper Woodlands Type de document : Article/Communication Auteurs : April Hulet, Auteur ; Bruce A. Roundy, Auteur ; Steven L. Petersen, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 799 - 808 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse comparative [Termes IGN] analyse d'image numérique [Termes IGN] arbre (flore) [Termes IGN] Californie (Etats-Unis) [Termes IGN] carte de la végétation [Termes IGN] classification dirigée [Termes IGN] données de terrain [Termes IGN] image infrarouge [Termes IGN] Nevada (Etats-Unis) [Termes IGN] occupation du sol [Termes IGN] Oregon (Etats-Unis) [Termes IGN] Pinus (genre) [Termes IGN] plantation forestière [Termes IGN] Utah (Etas-Unis) Résumé : (Auteur) Land managers need to rapidly assess vegetation composition and bare ground to effectively evaluate and manage shrub steppe communities that have been encroached by pinyon and juniper trees. We used an object-based image analysis (obia) approach to estimate land cover classes found in pinyon-juniper woodlands, and evaluated the relationship between ground measurements and OBIA land cover measurements. We acquired high-spatial resolution color-infrared imagery for five sites with a Vexcel UltraCamX digital camera in June 2009. We simultaneously collected ground-based cover measurements within 30 m x 33 m subplots. OBIA mean land cover class differences by site ranged from underestimating litter by 3 percent to overestimating live trees by 1 percent when compared to ground-based measurements. Overall accuracy for thematic maps was 84 percent with a Kappa statistic of 0.80. Although OBIA cover estimates varied slightly from ground cover estimates, methods provide land managers with options for prioritizing management practices and enabling monitoring at an operational scale. Numéro de notice : A2013-505 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.79.9.799 En ligne : https://doi.org/10.14358/PERS.79.9.799 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32643 [article]