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Use of very high spatial resolution remotely sensed imagery for assessing land-cover changes in shrub habitat preserves of the southern California / P. Longmire in Geocarto international, vol 16 n° 4 (December 2001 - February 2002)  

Public [article]  inGeocarto international > vol 16 n° 4 (December 2001 - February 2002) . - pp 47 - 57 Titre : Use of very high spatial resolution remotely sensed imagery for assessing land-cover changes in shrub habitat preserves of the southern California Type de document : Article/Communication Auteurs : P. Longmire, Auteur ; D. Stow, Auteur Année de publication : 2001 Article en page(s) : pp 47 - 57 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse diachronique [Termes IGN] bande visible [Termes IGN] Californie (Etats-Unis) [Termes IGN] détection de changement [Termes IGN] flore locale [Termes IGN] image à très haute résolution [Termes IGN] image ADAR [Termes IGN] image multibande [Termes IGN] image multitemporelle [Termes IGN] occupation du sol [Termes IGN] rayonnement proche infrarouge [Termes IGN] superposition d'images Résumé : (Auteur) The goal of this research was to explore the utility of very high spatial resolution, digital remotely sensed imagery for monitoring land-cover changes in habitat preserves within southern California coastal shrublands. Changes were assessed for Los Penasquitos Canyon Preserve, a large open space in San Diego County, over the 1996 to 1999 period for which imagery was available. Multispectral, digital camera imagery from two summer dates, three years apart, was acquired using the Airborne Data Acquisition and Registration (ADAR) digital-camera system. These very high resolution (VHR) image data (1 m), composed of three visible and one near-infrared wavebands (V/NIR), were the primary image input for assessing land cover change. Image-derived datasets generated from georeferenced and registered ADAR imagery included multitemporal overlays and multitemporal band differencing with threshold selection. Two different multitemporal image classifications were generated from these datasets and compared. Single-date imagery was analyzed interactively with image-derived datasets and with information from field observations in an effort to discern change types. A ground sampling survey conducted soon after the 1999 image acquisition provided concurrent ground reference data. Most changes occurring within the three-year interval were associated with transitional phenological states and differential precipitation effects on herbaceous cover. Variations in air temperatures and timing of rainfall contributed to differences that the seven-week image acquisition offset may have caused. Disturbance factors of mechanical clearing, erosion, potentially invasive plants, andfire were evident and their influence on the presence, absence, and type of vegetation cover were likely sources of change signals. The multitemporal VHR, V/NIR image data enabled relatively fine-scale land cover changes to be detected and identified. Band differencing followed by mutlitemporal classification provided an effective means for detecting vegetation increase or decrease. Detailed information on short term disturbance effects and long-term vegetation type conversions can be extracted if image acquisitions are carefully planned and geometric and radiometric processing steps are implemented. Numéro de notice : A2002-040 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040108542214 En ligne : https://doi.org/10.1080/10106040108542214 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21957 [article]

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