Image-analysis and cartography of sand hill massifs on high resolution images: application to the Great Western Erg (NW of Algerian Sahara)

Callot, Yann; Méring, Catherine; Simonin, A.

doi:10.1080/01431169408954359

Cited by 19 publications

(4 citation statements)

References 2 publications

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“…An example is given in part 4. The most precise satellite data, like the SPOT Panchromatic images (pixels of 10 x 10m) are also precise and may be read in details or even studied by automatic mapping [38], especially for the sandy areas.…”

Section: Quantification and Generalisation From Local Datamentioning

confidence: 99%

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Geomorphologic approach for modelling the surface features of arid environments in a model of dust emissions: application to the Sahara desert

2000

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Mineral dust emissions from arid regions are influenced by the surface features encountered in the source regions. These surface features control both the erosion threshold and the intensity of the dust flux. Recently, a soil-derived dust emission scheme has been designed in order to provide an explicit representation of the mineral dust accounting for the influence of the surface features on the dust emissions. This physical scheme has been validated with micro-scale field measurements. Its large scale application has required the development of additional relations to estimate the input parameters from more accessible data: the mean height and the covering rate of the roughness elements and the mineralogical soil type. The determination of these surface data has been based on a geomorphologic approach which describes the surface features of arid areas in a 1 x 1 0 grid. Inside each square degree, up to five different areas characterised by different surface features have been distinguished. However, these areas have not been located inside the square degree. Each area can be constituted by several combined surface features, including roughness, vegetation, granulometry. Five m?in types of landscapes and eight main types of surface features have been distinguished. This approach is based on the combination of various data, mainly topographical, geological maps and climatological analysis. In addition to the problem of scale transfer, the main constraints to obtain a quantitative assessment are the confidence level of the existing data and the number of parameters to document. On the opposite, with this method, the fine scale required by the dust modelling can be separated from the scale accessible by the mapping approach, of the order of the square degree. This method can also be easily improved by aggregating new data and can be extended to other deserts. An example of application is given for the north-west of the Algerian Sahara where the method has been elaborated. The data provided by the modelling of * Correspondence and reprints.

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Section: Quantification and Generalisation From Local Datamentioning

confidence: 99%

“…• stable dome dunes made of coarse sands (median particle diameter approximately 700 11m) overlaid by active dunes made of fine sands (median particle diameter approximately 250 11m) [29,38]; • interdune corridors where coarse sands are attacked by aeolian deflation. Neogene substratum practically never outcrops.…”

Section: The Great Western Ergmentioning

confidence: 99%

Geomorphologic approach for modelling the surface features of arid environments in a model of dust emissions: application to the Sahara desert

2000

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“…The aim of the study was here to map automatically deflation zones from SPOT Panchromatic images (Fig. 7), to know about the direction of the winds responsible of this deflation corridors [6]. The whole mapping is coming from the delimitation of the seifs (small dune shapes).…”

Section: Mapping Of Dunes In Desertic Zonesmentioning

confidence: 99%

Analysis and Mapping of Natural Landscapes from Satellite Images Using Morphological Filters

Méring

Callot

Kemmouche

1996

Microsc. Microanal. Microstruct.

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Résumé. 2014 Une approche morphologique est proposée pour étudier la dynamique des paysages naturels à partir d'images satellite. Les milieux étudiés connaissent tous une évolution importante due à des facteurs géologiques ou climatiques. Afin de cartographier les éléments du paysage, témoins de cette dynamique, nous mettons en 0153uvre des méthodes basées sur les filtres morphologiques. Abstract. 2014 A morphological approach is proposed for the study of natural landscapes from satellite images. The environment under study is affected by recent evolution due to geological and climatic events. Image processing based on Morphological Filtering is used in order to extract and map the landforms which are the marks of change of the environment.

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“…Μορφολογικά φίλτρα (Callot, Mering, Simonin, 1994, Mering, Callot, Kemmouche, 1996 χρησιμοποιούνται επίσης για την εξαγωγή και χαρτογράφηση σχηματισμών από παγχρωματικές εικόνες SPOT αμμωδών ερήμων.…”

Section: εισαγωγή στους μορφολογικούς τελεστέςunclassified

Ακουστική Χαρτογράφηση Επιλεγμένων Περιοχών Τησ Υφαλοκρηπίδας Των Κόλπων Του Μεραμβέλλου Και Της Καζαμπλάνκα

Sgouros¹,

Σγουρός²

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Σχ. A5γ. Τα δείγματα που συλλέχθησαν από τη ζώνη έρευνας (συνέχεια 2). Κλίμακα οριζόντιας και κάθετης διάστασης φωτογραφίας: 21x29,7 cm.Το μεγαλύτερο ποσοστό ιζήματος αποτελείται από λεπτόκοκκη άμμο. Η μέση τιμή πυκνότητας των δειγμάτων είναι 2,7891 gr/cm 3 . Στους παρακάτω πίνακες παρατίθενται οι εργαστηριακές αναλύσεις για τον υπολογισμό της πυκνότητας και της διαμέτρου των κόκκων.

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Image-analysis and cartography of sand hill massifs on high resolution images: application to the Great Western Erg (NW of Algerian Sahara)

Cited by 19 publications

References 2 publications

Geomorphologic approach for modelling the surface features of arid environments in a model of dust emissions: application to the Sahara desert

Geomorphologic approach for modelling the surface features of arid environments in a model of dust emissions: application to the Sahara desert

Analysis and Mapping of Natural Landscapes from Satellite Images Using Morphological Filters

Ακουστική Χαρτογράφηση Επιλεγμένων Περιοχών Τησ Υφαλοκρηπίδας Των Κόλπων Του Μεραμβέλλου Και Της Καζαμπλάνκα

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