@inproceedings{fdi:010012919,
  title = {{E}valuation spatiale et multi-temporelle de la cangahua {\`a} partir d'images {SPOT}},
  author = {{D}e {N}oni, {G}eorges and {V}iennot, {M}arc},
  editor = {},
  language = {{FRE}},
  abstract = {{T}he cangahua, important component of the {E}cuadorian highlands landscape presents a very weak fertility. {T}his is the result of old-fashioned and inadequate management by the indigenous populations, whose food needs exceed agricultural supplies. {I}t was interesting to evaluate a dynamic process such as the extension of the cangahua with remote sensing from images {SPOT} as the cangahua mineral material presented a typic spectral response in the 3 main hands. {T}wo experiences are presented: the first dealt with a spatialization of the cangahua on two 10-years periods (1986-1995), on the slopes of the volcano {I}lalo, close to {Q}uito, in awell-known and small region (15 sq km). {T}he second compared a conventional field mapping to a satellite mapping of the whole new volcwnic highlands (5 scenes of 60 sq km). {T}he method leant on the definition of themes, the identification of these on well-known areas (trainig samples), the definition of spectral characteristics of the training samples and the extrapolation to the wholw region (classification) in order to minimize geometrical distortions, angular incidence and atmospheric conditions. {T}he first study emphasized the increase of cangahua areas in relation with the settlement, the travelling of men and cattle; the theme of discontinous cangahua with a broad spectral signature expalined a process still dynamic nowadays. {T}he comparison of the 2 mappings showed a convergence for the typic cangahua but the results differed for the disconrinuous one. {R}emopte-sensing is an efficient tool for mapping cangahua. {H}owever it requieres a good knowledge of the field and improvement and automation of the various distorsions. ({R}{\'e}sum{\'e} d'auteur).},
  keywords = {{CARTE} {PEDOLOGIQUE} ; {VARIATION} {SPATIALE} ; {VARIATION} {TEMPORELLE} ; {IMAGE} {SATELLITE} ; {TELEDETECTION} {SPATIALE} ; {SATELLITE} {SPOT} ; {CLASSIFICATION} {DIRIGEE} ; {METHODOLOGIE} ; {EROSION} ; {CANGAHUA} ; {EQUATEUR} ; {ANDES}},
  numero = {},
  pages = {138--148},
  booktitle = {{S}uelos volcanicos endurecidos},
  year = {1997},
  URL = {https://www.documentation.ird.fr/hor/fdi:010012919},
}