Abstract In Western African Sahel, the everlasting denudation of the soils is a danger for their productivity, more especially as bare light soils have often been over exploited by farming and pastoralism. Hence, these areas are threatened with degradation increased by the climatic variations. From remote sensing data, we study a set of desertification indicators. We experiment recurrent procedures that may allow the identification and measurement of parameters connected to these indicators, whatever origin the data may have. We shall apply these procedures to Landsat MSS data with two examples to explain the whole process: . a description of bare areas around villages (degradation of cultivated areas due to permanent cropping) by estimation of their surface and by calculation of a set of shape parameters; . the description of sand seas, by estimating the orientation of the bars and their repetitivity. The employed algorithms run morphological transformations and measurements of predefined objects on the image. Their degree of generalization let us use them on images coming from different scenes and even different sensors.


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    Title :

    Quantitative description of denudation forms in the Western African Sahel


    Contributors:

    Published in:

    Publication date :

    1987-01-01


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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