Centre de documentation
scientifique

Dépouillements

Evaluation of airborne video data for land-cover classification accuracy assessment / I.T. Grierson in Geocarto international, vol 18 n° 2 (June - August 2003)  

Public [article]  inGeocarto international > vol 18 n° 2 (June - August 2003) . - pp 27 - 35 Titre : Evaluation of airborne video data for land-cover classification accuracy assessment Type de document : Article/Communication Auteurs : I.T. Grierson, Auteur Année de publication : 2003 Article en page(s) : pp 27 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] Australie [Termes IGN] classification dirigée [Termes IGN] coût [Termes IGN] image Landsat-ETM+ [Termes IGN] image vidéo [Termes IGN] occupation du sol [Termes IGN] photo-interprétation assistée par ordinateur [Termes IGN] précision de la classification [Termes IGN] réalité de terrain Résumé : (Auteur) This research was designed to evaluate the operational utility of airborne video for classification accuracy assessment of satellite imagery. There are a number of logistical advantages in utilizing airborne video data particularly in remote or large catchment regions where ground accessibility can be prohibitively expensive. In a study of land cover characteristics in the Barossa Valley, South Australia comparisons of Landsat ETM+ classification accuracy assessments were derived from both airborne video and standard ground truthing point sampling techniques. The airborne video data was obtained by randomly frame grabbing 243 individual scenes along four predetermined flight lines and computing classification accuracies and error matrix statistics. These results were then compared with similar statistics derive ' dfirom 180 randomly chosen ground sampling sites. The costs involved in obtaining both sets of data per sampling point were also calculated. The results demonstrated that the airborne video data provided similar degrees of accuracy assessment at a cost of approximately one seventh that of the ground survey with the added advantages of increased data collection, overall improved site accessibility and the ability to continually store and review the data. The cost differentiation would become even more pronounced in more remote and inaccessible areas. In general the results of the unsupervised Landsat ETM+ classification were rather poor producing an overall general accuracy of 70% and a Kappa coefficient of 0.65, highlighting the classification difficulties encountered in using commercial satellite imagery for land cover assessments in an area with very heterogeneous fine grained land use patterns. Numéro de notice : A2003-222 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040308542270 Date de publication en ligne : 02/01/2008 En ligne : https://doi.org/10.1080/10106040308542270 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22517 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-03021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Spatio-temporal GIS development to aid multi-use forest management / J. Lawley in Geocarto international, vol 18 n° 2 (June - August 2003)  

Public [article]  inGeocarto international > vol 18 n° 2 (June - August 2003) . - pp 49 - 59 Titre : Spatio-temporal GIS development to aid multi-use forest management Type de document : Article/Communication Auteurs : J. Lawley, Auteur ; R. Hickey, Auteur ; A. Wayne, Auteur ; G. Wright, Auteur Année de publication : 2003 Article en page(s) : pp 49 - 59 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] agriculture [Termes IGN] aménagement forestier [Termes IGN] Australie [Termes IGN] données spatiotemporelles [Termes IGN] écosystème [Termes IGN] évaluation des données [Termes IGN] faune [Termes IGN] population animale [Termes IGN] SQL [Termes IGN] système d'information géographique [Termes IGN] visualisation Résumé : (Auteur) This research investigates the potential of a dedicated Geographic Information System (GIS) to provide spatiotemporal data visualisation and analysis to aid multiple-use forest management in the Kingston State Forest, near Manjimup, Western Australia. The goals of this research are to develop and use sophisticated data evaluation techniques to assist in understanding the ecology of the western ringtail possum and to evaluate the impact of current timber harvesting practices on possum populations to ensure the jarrah forests continue to support them. Data used included digital topographic data as well as spatial and temporal fauna observation data. Visual representation of interactive queries offered a conceptual understanding of the spatial structure and temporal aspects of the data, showing that possum behaviour differed between harvested and nonharvested areas within the research site. Furthermore, the dedicated GIS proved its utility as a management and research tool that is readily transferable and accessible to multiple-use land managers and research scientists, offering a generic environment fior subsequent fauna habitat research. The focus of this paper is the development of the dedicated GIS environment. Numéro de notice : A2003-223 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040308542272 Date de publication en ligne : 02/01/2008 En ligne : https://doi.org/10.1080/10106040308542272 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22518 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-03021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A CCD camera-based hyperspectral imaging system for stationary and airborne applications / C. Yang in Geocarto international, vol 18 n° 2 (June - August 2003)  

Public [article]  inGeocarto international > vol 18 n° 2 (June - August 2003) . - pp 71 - 80 Titre : A CCD camera-based hyperspectral imaging system for stationary and airborne applications Type de document : Article/Communication Auteurs : C. Yang, Auteur ; James H. Everitt, Auteur ; M.R. Davis, Auteur Année de publication : 2003 Article en page(s) : pp 71 - 80 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] bande spectrale [Termes IGN] capteur imageur [Termes IGN] chambre DTC [Termes IGN] correction géométrique [Termes IGN] distorsion d'image [Termes IGN] image hyperspectrale [Termes IGN] photographie aérienne [Termes IGN] photographie terrestre [Termes IGN] spectrographe Résumé : (Auteur) This paper describes a CCD (charge coupled device) camerabased hyperspectral imaging system designed for both stationary and airborne remote sensing applications. The system consists of a high performance digital CCD camera, an imaging spectrograph, an optional focal plane scanner, and a PC computer equipped with a frame grabbing board and camera utility software. The CCD camera provides 1280(h) x 1024(v) pixel resolution and true 12bit dynamic range. The imaging spectrograph is attached to the camera via an adapter to disperse radiation into a range of spectral bands. The effective spectral range resulting from this integration is from 457.2 nm to 921.7 nm. The optional focal plane scanner can be attached to the front of the spectrograph via another adapter for stationary image acquisition. The camera and the frame grabbing board are connected via a double coaxial cable, and the utility software allows for complete camera control and image acquisition. The imaging system captures one line image for all the bands at a time and an aircraft or the focal plane scanner serves as a mobile platform to carrv out push broom scanning in the alongtrack direction. The horizontal and vertical binning capability of the camera makes it possible to obtain images with various spatial (160, 320, 640 and 1280 pixels in image width) and spectral (32, 64, 128, 256, 512 and 1024 bands) resolutions. Formulas are presented to show the relationships among binning factors, spatial resolutions, and flight height and speed. Images with all 24 possible combinations of binning factors were collected in a laboratory setting. Airborne images with 128 bands and a width of 640 pixels were also obtained from agricultural fields, rangelands and waterways. Procedures were developed to correct geometric distortions of the airborne hyperspectral imagery. Preliminary image acquisition testing trials indicate that this CCD camerabased hyperspectral imaging system has potential for agricultural and natural resources applications. Numéro de notice : A2003-224 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040308542274 Date de publication en ligne : 02/01/2008 En ligne : https://doi.org/10.1080/10106040308542274 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22519 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-03021	RAB	Revue	Centre de documentation	En réserve L003	Disponible