MODELISATION DYNAMIQUE A L'AIDE D'IMAGES SATELLITAIRES ET DE SYSTEMES D'INFORMATION GEOGRAPHIQUE. APPLICATION AUX LLANOS ORIENTALES DE LA COLOMBIE

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ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis MODELISATION DYNAMIQUE A L'AIDE D'IMAGES SATELLITAIRES ET DE SYSTEMES D'INFORMATION GEOGRAPHIQUE. APPLICATION AUX LLANOS ORIENTALES DE LA COLOMBIE by : GUILLERMO.. PARRA

Download or read book MODELISATION DYNAMIQUE A L'AIDE D'IMAGES SATELLITAIRES ET DE SYSTEMES D'INFORMATION GEOGRAPHIQUE. APPLICATION AUX LLANOS ORIENTALES DE LA COLOMBIE written by GUILLERMO.. PARRA and published by . This book was released on 1997 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PRESENTE LES RECHERCHES QUI ONT MENE A PROPOSER UNE STRUCTURE FONCTIONNELLE, OU MODELE, PERMETTANT DE REALISER L'ANALYSE DU CHANGEMENT ET LA MODELISATION SPATIALE DES ELEMENTS DU PAYSAGE A L'AIDE DES IMAGES SATELLITAIRES ET DES SYSTEMES D'INFORMATION GEOGRAPHIQUE (SIG). LE MODELE A COMME OBJECTIF DE CONTRIBUER A LA COMPREHENSION DU COMPORTEMENT DE LA COUVERTURE DES SOLS AINSI QUE D'AIDER A ESTIMER L'AMPLEUR DES PRATIQUES AGRICOLES TOUCHANT L'ENVIRONNEMENT. LE SITE OU LA PREMIERE IMPLANTATION A ETE REALISEE SE TROUVE AU MILIEU DES LLANOS ORIENTALES COLOMBIENS, A CARIMAGUA, OU UNE ANTENNE DU CENTRE INTERNATIONAL D'AGRICULTURE TROPICALE EST LOCALISEE. LA DEMARCHE GENERALE A ETE DE DEVELOPPER D'ABORD DES TECHNIQUES D'ANALYSE DU CHANGEMENT LOCAL ET GLOBAL CAPABLES D'AGIR EN L'ABSENCE DE DONNEES CLIMATIQUES FIABLES AU MOMENT DE LA PRISE DE VUE. ENSUITE NOUS AVONS INTEGRE CES TECHNIQUES A L'INTERIEUR D'UN SIG QUI GERE LEURS RESULTATS ET LES UTILISE POUR REALISER DES ESTIMATIONS DES TENDANCES D'EVOLUTION. DANS CE BUT NOS TRAVAUX SE SONT DECOMPOSES EN DEUX PHASES. LA PREMIERE PARTIE PORTE SUR LES DIFFERENTES METHODES DE DETECTION DE CHANGEMENT. NOUS AVONS CHOISI D'ETUDIER EN DETAIL L'ANALYSE PAR VECTEURS DE CHANGEMENT ET LES METHODES EMPLOYANT L'ANALYSE EN COMPOSANTES PRINCIPALES (ACP). LES VECTEURS DE CHANGEMENT SONT UTILISES POUR LA REALISATION D'UN APERCU GLOBAL ET NON DETAILLE DES CHANGEMENTS DE LA COUVERTURE DU SOL. UNE FOIS QUE LES METHODES UTILISANT L'ACP ONT MONTRE LEUR POTENTIEL POUR LA DETECTION LOCALE DU CHANGEMENT, NOUS AVONS DEVELOPPE DEUX NOUVELLES APPROCHES BASEES SUR CETTE TECHNIQUE. LA SECONDE PARTIE A ETE CONSACREE A L'INTEGRATION DE L'INFORMATION SPATIALE DU CHANGEMENT AVEC DES DONNEES CLIMATIQUES ET/OU DES CONNAISSANCES EMPIRIQUES, AFIN DE FOURNIR DES TENDANCES D'EVOLUTION POUR CHACUN DES ELEMENTS DU PAYSAGE A L'AIDE DE LA THEORIE DE L'EVIDENCE DE DEMPSTER-SHAFER. LE SEAM-SYSTEME EVOLUTIF POUR L'ANALYSE ET LA MODELISATION- EST LA STRUCTURE FONCTIONNELLE DESTINEE A CONSERVER L'ASPECT SPATIAL ET A INTEGRER LA PREVISION TEMPORELLE DES TENDANCES A L'AIDE DE LA THEORIE DE L'EVIDENCE. EN EFFET, APRES L'ETUDE DES DIFFERENTS TYPES DE MODELES, LA STRUCTURE PROPOSEE PAR LES MODELES PRIVILEGIANT L'ASPECT SPATIAL DE LA MODELISATION EST RETENUE. LE BUT EST DE DETERMINER UNE TENDANCE D'EVOLUTION POUR CHACUNE DES PRINCIPALES UNITES HOMOGENES DE COMPORTEMENT COMPOSANT LE PAYSAGE. L'ANALYSE DES RESULTATS OBTENUS ET LES DIFFICULTES RENCONTREES SONT FINALEMENT PRESENTEES.

Plants of Desert Dunes

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Publisher : Springer Science & Business Media
ISBN 13 : 3642609759
Total Pages : 182 pages
Book Rating : 4.6/5 (426 download)

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Book Synopsis Plants of Desert Dunes by : Avinoam Danin

Download or read book Plants of Desert Dunes written by Avinoam Danin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on three decades of field experience in southwest Asia, southern Africa, and the southwest United States, the author summarizes the major adaptations of plants to desert dunes. This integrative study of plant and diaspore morphology, reactive growth, life cycles, and environmental factors explains and predicts plant distribution. Many kinds of dune syndromes, plant case studies and vegetation transects are discussed and illustrated to clarify the significance of adaptations to specific habitat factors. Although the focus is on vascular plants, the development of microbiotic soil crust, its function, and its composition are discussed as well.

Sand Stabilization and Dune Building

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ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (359 download)

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Book Synopsis Sand Stabilization and Dune Building by : M. J. Adriani

Download or read book Sand Stabilization and Dune Building written by M. J. Adriani and published by . This book was released on 1974 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Physiological Ecology of North American Plant Communities

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Publisher : Springer Science & Business Media
ISBN 13 : 9400948301
Total Pages : 704 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Physiological Ecology of North American Plant Communities by : Brain F. Chabot

Download or read book Physiological Ecology of North American Plant Communities written by Brain F. Chabot and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although, as W.D. Billings notes in his chapter in this book. the development of physiological ecology can be traced back to the very beginnings of the study of ecology it is clear that the modern development of this field in North America is due in the large part to the efforts of Billings alone. The foundation that Billings laid in the late 1950s came from his own studies on deserts and subsequently arctic and alpine plants, and also from his enormous success in instilling enthusiasm for the field in the numerous students attracted to the plant ecology program at Duke University. Billings' own studies provided the model for subsequent work in this field. Physiological techniques. normally confined to the laboratory. were brought into the field to examine processes under natural environmental conditions. These field studies were accompanied by experiments under controlled conditions where the relative impact of various factors could be assessed and further where genetic as opposed to environmental influences could be separated. This blending of field and laboratory approaches promoted the design of experiments which were of direct relevance to understanding the distribution and abundance of plants in nature. Physiological mechanisms were studied and assessed in the context of the functioning of plants under natural conditions rather than as an end in itself.

Eolian Sediments and Processes

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Publisher : Elsevier
ISBN 13 : 0080869521
Total Pages : 671 pages
Book Rating : 4.0/5 (88 download)

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Book Synopsis Eolian Sediments and Processes by : M.E. Brookfield

Download or read book Eolian Sediments and Processes written by M.E. Brookfield and published by Elsevier. This book was released on 2000-04-01 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers cover the entire spectrum of eolian investigations, ranging from the microscopic level to regional synthesis as well as ancient eolian deposits and their interpretation.

Glacial Sedimentary Environments

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Publisher :
ISBN 13 : 9780835769938
Total Pages : 246 pages
Book Rating : 4.7/5 (699 download)

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Book Synopsis Glacial Sedimentary Environments by : Gail M. Ashley

Download or read book Glacial Sedimentary Environments written by Gail M. Ashley and published by . This book was released on 1985 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Physics of Desertification

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Publisher : Springer
ISBN 13 : 9024732921
Total Pages : 473 pages
Book Rating : 4.0/5 (247 download)

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Book Synopsis Physics of Desertification by : F. El-Baz

Download or read book Physics of Desertification written by F. El-Baz and published by Springer. This book was released on 1986-04-30 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deserts are parts of the Earth that receive little or no rain; 25 cm or less per year. The physical processes that act upon these parched lands are vastly different from those that shape the more humid parts of the terrestrial landmasses. In the desert, wind is a major agent of erosion and transportation. As the results of recent space missions have indicated, this is also true in the case of the planet Mars. Thus, our understanding of desert processes sheds light on fundamental planetary processes that may apply on any planetary body that is enveloped by a windy atmosphere. An understanding of the physical layout of arid lands, and the nature of processes that initiate changes therein is also fundamental to thoughtful utilization of these lands for the benefit of mankind. It is with this in mind that we prepared this book for publication. We believe that the collection of articles in this book will be useful to scientists who are interested in desert landforms and processes, and to planners of economic develop ment of arid lands. The book also serves as a guide for students as to the state of our knowledge in this field as well as to the topics that require additional research.

Late Cainozoic Palaeoclimates of the Southern Hemisphere

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (633 download)

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Book Synopsis Late Cainozoic Palaeoclimates of the Southern Hemisphere by : J. C. Vogel

Download or read book Late Cainozoic Palaeoclimates of the Southern Hemisphere written by J. C. Vogel and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Studies on the Quaternary: Papers Prepared on the Occasion of the VII Congress of the International Association for Quaternary Research Boulder, Colorado, 1965

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Publisher : Geological Society of America
ISBN 13 : 0813720842
Total Pages : 608 pages
Book Rating : 4.8/5 (137 download)

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Book Synopsis International Studies on the Quaternary: Papers Prepared on the Occasion of the VII Congress of the International Association for Quaternary Research Boulder, Colorado, 1965 by : Herbert Edgar Wright

Download or read book International Studies on the Quaternary: Papers Prepared on the Occasion of the VII Congress of the International Association for Quaternary Research Boulder, Colorado, 1965 written by Herbert Edgar Wright and published by Geological Society of America. This book was released on 1965 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Reference Handbook on the Deserts of North America

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Publisher : Greenwood
ISBN 13 :
Total Pages : 616 pages
Book Rating : 4.4/5 (91 download)

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Book Synopsis Reference Handbook on the Deserts of North America by : Gorden L. Bender

Download or read book Reference Handbook on the Deserts of North America written by Gorden L. Bender and published by Greenwood. This book was released on 1982-06-29 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Product information not available.

Sand, Wind, and War

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ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Sand, Wind, and War by : Ralph A. Bagnold

Download or read book Sand, Wind, and War written by Ralph A. Bagnold and published by . This book was released on 1990 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sand, Wind, and War records the work, travels and adventures of one of the last of the great British explorers, a man who served in both world wars and carved out a special niche in science through his studies of desert sands. Ralph Alger Bagnold was born in 1896 into a military family and educated as an engineer. Posted to Egypt in 1926, he was one of a group of officers who adapted Model T Fords to desert travel and in 1932 made the first east-west crossing—6,000 miles—of the Libyan desert. Bagnold established such a name for himself that in World War II he was again posted to Egypt where he founded and trained the Long Range Desert Group that was to confound the German and Italian armies. Bagnold’s fascination with the desert included curiosity over the formation of dunes, and beginning in 1935 he conducted wind tunnel experiments with sand that led to the book The Physics of Blown Sand and Desert Dunes. Eventually, he was to see his findings called on by NASA to interpret data on the sands of Mars. He devoted subsequent research to particle flow in fluids, and also served as a consultant to Middle Eastern governments concerned with the interference of sand flow in oil drilling. Sand, Wind, and War is the life story of a man who not only helped shape events in one part of the world but also contributed to our understanding of it. It is a significant benchmark not only in the history of science, but also in the annals of adventure.

Australia

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ISBN 13 : 9780710089298
Total Pages : 571 pages
Book Rating : 4.0/5 (892 download)

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Book Synopsis Australia by : Dennis Norman Jeans

Download or read book Australia written by Dennis Norman Jeans and published by . This book was released on 1978 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Kharga Oasis

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ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis Kharga Oasis by : John Ball

Download or read book Kharga Oasis written by John Ball and published by . This book was released on 1900 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Automated Generation of Geometrically-precise and Semantically-informed Virtual Geographic Environnements Populated with Spatially-reasoning Agents

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (113 download)

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Book Synopsis Automated Generation of Geometrically-precise and Semantically-informed Virtual Geographic Environnements Populated with Spatially-reasoning Agents by : Mehdi Mekni

Download or read book Automated Generation of Geometrically-precise and Semantically-informed Virtual Geographic Environnements Populated with Spatially-reasoning Agents written by Mehdi Mekni and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La Géo-Simulation Multi-Agent (GSMA) est un paradigme de modélisation et de simulation de phénomènes dynamiques dans une variété de domaines d'applications tels que le domaine du transport, le domaine des télécommunications, le domaine environnemental, etc. La GSMA est utilisée pour étudier et analyser des phénomènes qui mettent en jeu un grand nombre d'acteurs simulés (implémentés par des agents) qui évoluent et interagissent avec une représentation explicite de l'espace qu'on appelle Environnement Géographique Virtuel (EGV). Afin de pouvoir interagir avec son environnement géographique qui peut être dynamique, complexe et étendu (à grande échelle), un agent doit d'abord disposer d'une représentation détaillée de ce dernier. Les EGV classiques se limitent généralement à une représentation géométrique du monde réel laissant de côté les informations topologiques et sémantiques qui le caractérisent. Ceci a pour conséquence d'une part de produire des simulations multi-agents non plausibles, et, d'autre part, de réduire les capacités de raisonnement spatial des agents situés. La planification de chemin est un exemple typique de raisonnement spatial dont un agent pourrait avoir besoin dans une GSMA. Les approches classiques de planification de chemin se limitent à calculer un chemin qui lie deux positions situées dans l'espace et qui soit sans obstacle. Ces approches ne prennent pas en compte les caractéristiques de l'environnement (topologiques et sémantiques), ni celles des agents (types et capacités). Les agents situés ne possèdent donc pas de moyens leur permettant d'acquérir les connaissances nécessaires sur l'environnement virtuel pour pouvoir prendre une décision spatiale informée. Pour répondre à ces limites, nous proposons une nouvelle approche pour générer automatiquement des Environnements Géographiques Virtuels Informés (EGVI) en utilisant les données fournies par les Systèmes d'Information Géographique (SIG) enrichies par des informations sémantiques pour produire des GSMA précises et plus réalistes. De plus, nous présentons un algorithme de planification hiérarchique de chemin qui tire avantage de la description enrichie et optimisée de l'EGVI pour fournir aux agents un chemin qui tient compte à la fois des caractéristiques de leur environnement virtuel et de leurs types et capacités. Finalement, nous proposons une approche pour la gestion des connaissances sur l'environnement virtuel qui vise à supporter la prise de décision informée et le raisonnement spatial des agents situés.

The Evolution of a Coast-line, Barrow to Aberystwyth and the Isle of Man, With Notes on Lost Towns, Submarine Discoveries, &c

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Publisher : Legare Street Press
ISBN 13 : 9781016599337
Total Pages : 0 pages
Book Rating : 4.5/5 (993 download)

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Book Synopsis The Evolution of a Coast-line, Barrow to Aberystwyth and the Isle of Man, With Notes on Lost Towns, Submarine Discoveries, &c by : William Ashton

Download or read book The Evolution of a Coast-line, Barrow to Aberystwyth and the Isle of Man, With Notes on Lost Towns, Submarine Discoveries, &c written by William Ashton and published by Legare Street Press. This book was released on 2022-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Ecology of Coastal Vegetation

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Publisher : Springer
ISBN 13 : 9789061935315
Total Pages : 640 pages
Book Rating : 4.9/5 (353 download)

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Book Synopsis Ecology of Coastal Vegetation by : W.G. Beeftink

Download or read book Ecology of Coastal Vegetation written by W.G. Beeftink and published by Springer. This book was released on 1985-07-31 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of an Innovative System for the Reconstruction of New Generation Satellite Images

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ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (867 download)

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Book Synopsis Development of an Innovative System for the Reconstruction of New Generation Satellite Images by : Luca Lorenzi

Download or read book Development of an Innovative System for the Reconstruction of New Generation Satellite Images written by Luca Lorenzi and published by . This book was released on 2012 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les satellites de télédétection sont devenus incontournables pour la société civile. En effet, les images satellites ont été exploitées avec succès pour traiter plusieurs applications, notamment la surveillance de l'environnement et de la prévention des catastrophes naturelles. Dans les dernières années, l'augmentation de la disponibilité de très haute résolution spatiale (THR) d'images de télédétection abouti à de nouvelles applications potentiellement pertinentes liées au suivi d'utilisation des sols et à la gestion environnementale. Cependant, les capteurs optiques, en raison du fait qu'ils acquièrent directement la lumière réfléchie par le soleil, ils peuvent souffrir de la présence de nuages dans le ciel et / ou d'ombres sur la terre. Il s'agit du problème des données manquantes, qui induit un problème important et crucial, en particulier dans le cas des images THR, où l'augmentation des détails géométriques induit une grande perte d'informations. Dans cette thèse, de nouvelles méthodologies de détection et de reconstruction de la région contenant des données manquantes dans les images THR sont proposées et appliquées sur les zones contaminées par la présence de nuages et / ou d'ombres. En particulier, les contributions méthodologiques proposées comprennent: i) une stratégie multirésolution d'inpainting visant à reconstruire les images contaminées par des nuages ; ii) une nouvelle combinaison d'information radiométrique et des informations de position spatiale dans deux noyaux spécifiques pour effectuer une meilleure reconstitution des régions contaminés par les nuages en adoptant une régression par méthode a vecteurs supports (RMVS) ; iii) l'exploitation de la théorie de l'échantillonnage compressé avec trois stratégies différentes (orthogonal matching pursuit, basis pursuit et une solution d'échantillonnage compressé, basé sur un algorithme génétique) pour la reconstruction d'images contaminés par des nuages; iv) une chaîne de traitement complète qui utilise une méthode à vecteurs de supports (SVM) pour la classification et la détection des zones d'ombre, puis une régression linéaire pour la reconstruction de ces zones, et enfin v) plusieurs critères d'évaluation promptes à évaluer la performance de reconstruction des zones d'ombre. Toutes ces méthodes ont été spécialement développées pour fonctionner avec des images très haute résolution. Les résultats expérimentaux menés sur des données réelles sont présentés afin de montrer et de confirmer la validité de toutes les méthodes proposées. Ils suggèrent que, malgré la complexité des problèmes, il est possible de récupérer de façon acceptable les zones manquantes masquées par les nuages ou rendues erronées les ombres.