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Enabling UAV-based 3D mapping, Pix4D / Anonyme in GIM international, vol 26 n° 7 (July 2012)
[article]
Titre : Enabling UAV-based 3D mapping, Pix4D Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2012 Article en page(s) : pp 36 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition d'images
[Termes IGN] drone
[Termes IGN] image aérienne à axe vertical
[Termes IGN] image aérienne oblique
[Termes IGN] image en couleurRésumé : (Editeur) Pix4D has developed next-generation software that automatically combines raw images captured by lightweight Unmanned Aerial Vehicles (UAVs) to produce accurate measurements and visualisation of the environment. This enables timely, on-demand local 3D mapping. Numéro de notice : A2012-319 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31765
in GIM international > vol 26 n° 7 (July 2012) . - pp 36 - 37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-2012071 RAB Revue Centre de documentation Revues en salle Disponible Monitoring water stress and fruit quality in an orange orchard under regulated deficit irrigation using narrow-band structural and physiological remote sensing indices / S. Stagakis in ISPRS Journal of photogrammetry and remote sensing, vol 71 (July 2012)
[article]
Titre : Monitoring water stress and fruit quality in an orange orchard under regulated deficit irrigation using narrow-band structural and physiological remote sensing indices Type de document : Article/Communication Auteurs : S. Stagakis, Auteur ; V. Gonzales-Dugo, Auteur ; P. Cid, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 47 - 61 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Citrus sinensis
[Termes IGN] cultures irriguées
[Termes IGN] drone
[Termes IGN] image aérienne
[Termes IGN] image multibande
[Termes IGN] Séville
[Termes IGN] stress hydrique
[Termes IGN] vergerRésumé : (Auteur) This paper deals with the monitoring of water status and the assessment of the effect of stress on citrus fruit quality using structural and physiological remote sensing indices. Four flights were conducted over a citrus orchard in 2009 using an unmanned aerial vehicle (UAV) carrying a multispectral camera with six narrow spectral bands in the visible and near infrared. Physiological indices such as the Photochemical Reflectance Index (PRI570), a new structurally robust PRI formulation that uses the 515 nm as the reference band (PRI515), and a chlorophyll ratio (R700/R670) were compared against the Normalized Difference Vegetation Index (NDVI), Renormalized Difference Vegetation Index (RDVI) and Modified Triangular Vegetation Index (MTVI) canopy structural indices for their performance in tracking water status and the effects of sustained water stress on fruit quality at harvest. The irrigation setup in the commercial orchard was compared against a treatment scheduled to satisfy full requirements (based on estimated crop evapotranspiration) using two regulated deficit irrigation (RDI) strategies. The water status of the trees throughout the experiment was monitored with frequent field measurements of stem water potential (?x), while titratable acidity (TA) and total soluble solids (TSS) were measured at harvest on selected trees from each irrigation treatment. The high spatial resolution of the multispectral imagery (30 cm pixel size) enabled identification of pure tree crown components, extracting the tree reflectance from shaded, sunlit and aggregated pixels. The physiological and structural indices were then calculated from each tree at the following levels: (i) pure sunlit tree crown, (ii) entire crown, aggregating the within-crown shadows, and (iii) simulating a lower resolution pixel, including tree crown, sunlit and shaded soil pixels. The resulting analysis demonstrated that both PRI formulations were able to track water status, except when water stress altered canopy structure. In such cases, PRI570 was more affected than PRI515 by the structural changes caused by sustained water stress throughout the season. Both PRI formulations were proven to serve as pre-visual water stress indicators linked to fruit quality TSS and TA parameters (r2 = 0.69 for PRI515 vs TSS; r2 = 0.58 vs TA). In contrast, the chlorophyll (R700/R670) and structural indices (NDVI, RDVI, MTVI) showed poor relationships with fruit quality and water status levels (r2 = 0.04 for NDVI vs TSS; r2 = 0.19 vs TA). The two PRI formulations showed strong relationships with the field-measured fruit quality parameters in September, the beginning of stage III, which appeared to be the period most sensitive to water stress and the most critical for assessing fruit quality in citrus. Both PRI515 and PRI570 showed similar performance for the two scales assessed (sunlit crown and entire crown), demonstrating that within-crown component separation is not needed in citrus tree crowns where the shaded vegetation component is small. However, the simulation conducted through spatial resampling on tree + soil aggregated pixels revealed that the physiological indices were highly affected by soil reflectance and between-tree shadows, showing that for TSS vs PRI515 the relationship dropped from r2 = 0.69 to r2 = 0.38 when aggregating soil + crown components. This work confirms a previous study that demonstrated the link between PRI570, water stress, and fruit quality, while also making progress in assessing the new PRI formulation (PRI515), the within-crown shadow effects on the physiological indices, and the need for high resolution imagery to target individual tree crowns for the purpose of evaluating the effects of water stress on fruit quality in citrus. Numéro de notice : A2012-347 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.05.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.05.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31793
in ISPRS Journal of photogrammetry and remote sensing > vol 71 (July 2012) . - pp 47 - 61[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2012051 SL Revue Centre de documentation Revues en salle Disponible Forum de photogrammétrie / Anonyme in Géomatique expert, n° 86 (01/05/2012)
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Titre : Forum de photogrammétrie Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2012 Article en page(s) : pp 20 - 25 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] acquisition de données
[Termes IGN] données lidar
[Termes IGN] drone
[Termes IGN] géoréférencement
[Termes IGN] photogrammétrie terrestre
[Termes IGN] photographie numérique
[Termes IGN] positionnement cinématique
[Termes IGN] positionnement par GPS
[Termes IGN] référentiel à grande échelleRésumé : (Auteur) Organisé tous les ans par les élèves du master PPMD de l'ENSG, le forum de photogrammétrie fait le point sur les différentes techniques de levés et de positionnement, ainsi que leur exploitation dans des logiciels géomatiques. Cette année, le thème retenu était : "Prises de vues et positionnement cinématique : interactions et modernisation des techniques". Numéro de notice : A2012-222 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31668
in Géomatique expert > n° 86 (01/05/2012) . - pp 20 - 25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-2012031 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001321 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt UAV flight over Singapore: a pilot study / Armin W. Gruen in Geoinformatics, vol 15 n° 3 (01/04/2012)
[article]
Titre : UAV flight over Singapore: a pilot study Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur Année de publication : 2012 Article en page(s) : pp 34 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition d'images
[Termes IGN] chambre CMOS
[Termes IGN] drone
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] SingapourRésumé : (Editeur) For the first time Singaporean authorities have given permission for a photogrammetric UAV mapping/modeling flight over an important area of the city. In the context of the SEC-FCL (Future Cities Laboratory) project a pilot study is conducted with the goal to generate a high quality 3D city model of the NUS campus from UAV images. 800 images were needed to cover the area. Data processing is in progress. Numéro de notice : A2012-166 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31613
in Geoinformatics > vol 15 n° 3 (01/04/2012) . - pp 34 - 36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-2012031 SL Revue Centre de documentation Revues en salle Disponible Unmanned aerial vehicles: from toys to tools / Armin W. Gruen in Geoinformatics, vol 15 n° 1 (01/01/2012)
[article]
Titre : Unmanned aerial vehicles: from toys to tools Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur Année de publication : 2012 Article en page(s) : pp 14 - 16 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] drone
[Termes IGN] image aérienne
[Termes IGN] image aérienne à axe vertical
[Termes IGN] image aérienne obliqueRésumé : (Auteur) Unmanned aerial vehicles (UAVs) have recently attained great attention. This article explains why this is so and describes the wide range of users and applications. But UAVs also have a number of disadvantages, which have to be solved in the future in order to establish a good transition from 'toys to tools'. Numéro de notice : A2012-028 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31476
in Geoinformatics > vol 15 n° 1 (01/01/2012) . - pp 14 - 16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Investigation of UAV systems and flight modes for photogrammetric applications / Henri Eisenbeiss in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)PermalinkR-Pod : Un drone photogrammétrique au service du territoire / François Gervaix in Géomatique suisse, vol 109 n° 9 (01/09/2011)PermalinkPhotogrammetric processing of low-altitude images acquired by unpiloted aerial vehicles / Y. Zhang in Photogrammetric record, vol 26 n° 134 (June - August 2011)PermalinkL'acquisition de données mobiles en pratique / Anonyme in Géomatique expert, n° 80 (01/05/2011)PermalinkForum PPMD [2011] / Anonyme in Géomatique expert, n° 79 (01/03/2011)PermalinkA new standard for analyzing geospatial intelligence, Geo-fused video / W. Smith in Geoinformatics, vol 14 n° 1 (01/01/2011)PermalinkA low-cost multi-sensoral mobile mapping system and its feasibility for tree measurements / Anttoni Jaakkola in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 6 (November - December 2010)PermalinkAcquisition, orthorectification, and object-based classification of Unmanned Aerial Vehicle (UAV) imagery for rangeland monitoring / A. Laliberte in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 6 (June 2010)Permalink1 antenna, 3 dimensions: GPS flight control in UAV operations / C. Kee in Inside GNSS, vol 5 n° 2 (March - April 2010)PermalinkThe power of full motion vidéo: fusing with other intelligent data / L. Wood in Geoinformatics, vol 13 n° 2 (01/03/2010)Permalink