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Mapping an annual weed with colour-infared aerial photography and image analysis / James H. Everitt in Geocarto international, vol 25 n° 1 (February 2010)  

Public [article]  inGeocarto international > vol 25 n° 1 (February 2010) . - pp 45 - 52 Titre : Mapping an annual weed with colour-infared aerial photography and image analysis Type de document : Article/Communication Auteurs : James H. Everitt, Auteur ; C. Yang, Auteur ; M.R. Davis, Auteur Année de publication : 2010 Article en page(s) : pp 45 - 52 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] carte de la végétation [Termes IGN] classification dirigée [Termes IGN] classification non dirigée [Termes IGN] image numérisée [Termes IGN] parcours [Termes IGN] photographie aérienne [Termes IGN] photographie en couleur [Termes IGN] photographie infrarouge [Termes IGN] surveillance de la végétation [Termes IGN] Texas (Etats-Unis) Résumé : (Auteur) Silverleaf sunflower (Helianthus argophyllus, Torr and Gray) is an annual weed found on rangelands in south and southeast Texas. Colour-infrared aerial photography and computer image analysis techniques were evaluated for detecting and mapping silverleaf sunflower infestations on a south Texas rangeland area. Supervised and unsupervised image analysis classification techniques were used to classify photographs from two study sites. Supervised classification of the two photographs showed that silverleaf sunflower had mean producer's and user's accuracies of 95.2% and 91.3%, respectively. Unsupervised classification of the two photographs had mean producer's and user's accuracies for silverleaf sunflower of 65.7% and 80.1%, respectively. These results indicate that the supervised technique is superior to the unsupervised technique for mapping silverleaf sunflower infestations using colour-infrared aerial photos. Numéro de notice : A2010-053 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040802677037 Date de publication en ligne : 31/03/2009 En ligne : https://doi.org/10.1080/10106040802677037 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30249 [article]

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Evaluating airborne hyperspectral imagery for rangeland assessment in south Texas / James H. Everitt in Geocarto international, vol 19 n° 3 (September - November 2004)  

Public [article]  inGeocarto international > vol 19 n° 3 (September - November 2004) . - pp 23 - 31 Titre : Evaluating airborne hyperspectral imagery for rangeland assessment in south Texas Type de document : Article/Communication Auteurs : James H. Everitt, Auteur ; C. Yang, Auteur ; M.R. Davis, Auteur Année de publication : 2004 Article en page(s) : pp 23 - 31 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande visible [Termes IGN] composition colorée [Termes IGN] ERDAS Imagine [Termes IGN] flore locale [Termes IGN] image hyperspectrale [Termes IGN] occupation du sol [Termes IGN] rayonnement proche infrarouge [Termes IGN] réflectance spectrale [Termes IGN] Texas (Etats-Unis) Résumé : (Auteur) Airborne hyperspectral imagery was evaluated for differentiating among rangeland ecological variables on two range sites (tight sandy loam and shallow ridge) on south Texas rangelands. Field spectroradiometric reflectance measurements made on dominant vegetation (plant species and vegetation mixtures) and soil land-use types on the two sites identified six wavelengths [five visible and one near-infrared (NIR)] where significant spectral differences occurred among the parameters. The spectral bands that corresponded to these wavelengths were extracted from the 128-band hyperspectral images obtained of each site and used to develop false color composites that were subjected to computer classifications and accuracy assessments. The bands selected for the composites included the green (498.9 nm), yellow-green (549.7 nm), orange (629.6 nm), red (651.3 nm), dark red (680.4 nm), and NIR (825.5 tim). Accuracy assessments performed on the classification maps of four false color composites of the tight sandy loam site had overall accuracies ranging from 76% to 85%; the highest accuracy was obtained from the composite made up of the NIR, red, and yellow-green bands. Accuracy assessments performed on the classification maps of three composites of the shallow ridge site had overall accuracies ranging from 74% to 77%; the highest accuracy was acquired from a composite comprised of the NIR, orange, and yellow-green bands. Overall accuracies were considered good and indicate that several band combinations can be used successfully to differentiate among, rangeland parameters in southern Texas. Key Words: remote sensing, hyperspectral imagery, reflectance, false color composite imagery, accuracy assessment. Numéro de notice : A2004-478 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040408542314 Date de publication en ligne : 02/01/2008 En ligne : https://doi.org/10.1080/10106040408542314 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26996 [article]

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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]

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Relationship between plant spectral reflectances and their image tonal responses on aerial photographs / D.E. Escobar in Geocarto international, vol 17 n° 2 (June - August 2002)  

Public [article]  inGeocarto international > vol 17 n° 2 (June - August 2002) . - pp 63 - 74 Titre : Relationship between plant spectral reflectances and their image tonal responses on aerial photographs Type de document : Article/Communication Auteurs : D.E. Escobar, Auteur ; James H. Everitt, Auteur ; M.R. Davis, Auteur ; R.S. Fletcher, Auteur ; C. Yang, Auteur Année de publication : 2002 Article en page(s) : pp 63 - 74 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] émulsion photographique [Termes IGN] photographie aérienne [Termes IGN] photographie en couleur [Termes IGN] photographie infrarouge [Termes IGN] réflectance spectrale [Termes IGN] réflectance végétale [Termes IGN] réponse spectrale [Termes IGN] végétation Résumé : (Auteur) Conventional color (CC) and colorinfrared (CIR) photography have been used in a widerange of remote sensing applications. Many users, however, do not fully understand or know how to interpret it. Published plant photography / reflectance studies make little effort to help the layreader understand the relationship of plant spectral reflectance with their color tonal response on color photographic film. The objective of this paper is to describe the relationship of how spectral reflectances of plant species are registered on photographic film and how the resultant color tonal responses of the plants are produced in relation to their spectral reflectance. Illustrations are presented which simplify the interpretation of the interaction between plant canopy reflectance and CC/CIR photographic film emulsion layers, including the resultant color tones of the plants. Research studies addressing both plant photography and reflectance data can be more meaningful and better appreciated if one has a general understanding of these relationships. Numéro de notice : A2002-227 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542237 En ligne : https://doi.org/10.1080/10106040208542237 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22141 [article]

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Mid-infrared video : a possible tool for thermal analysis of wildfires / James H. Everitt in Geocarto international, vol 4 n° 4 (December 1989 - February 1990)  

Public [article]  inGeocarto international > vol 4 n° 4 (December 1989 - February 1990) . - pp 39 - 45 Titre : Mid-infrared video : a possible tool for thermal analysis of wildfires Type de document : Article/Communication Auteurs : James H. Everitt, Auteur ; D.E. Escobar, Auteur ; M.R. Davis, Auteur Année de publication : 1989 Article en page(s) : pp 39 - 45 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande visible [Termes IGN] caméra de télévision [Termes IGN] image thermique [Termes IGN] incendie de forêt [Termes IGN] rayonnement infrarouge moyen Numéro de notice : A1989-449 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106048909354233 En ligne : https://doi.org/10.1080/10106048909354233 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25407 [article]

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Using multispectral video imagery for detecting soil surface conditions / James H. Everitt in Photogrammetric Engineering & Remote Sensing, PERS, vol 55 n° 4 (april 1989)  

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Using airborne middle-infrared (1.45-2.0 micrometers) video imagery for distinguishing plant species and soil conditions / James H. Everitt in Remote sensing of environment, vol 22 n° 3 (01/08/1987)  

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