Anomalies on geologic maps from multispectral and textural classification: The Bleida mining district (Morocco)

The variogram analysis of different reference image facies on a SPOT-XS scene enables the definition of a discriminant texture index. The values of this index are extracted locally in a given neighborhood. This textural information is matched with the multispectral information in order to realize a combined classification. The result is subsequently compared to a digitized geological map, in order to extract zones of anomaly, regarded as the differences between the combined classification and the geological map. A majority of the anomalies require further interpretation, while certain others are interesting to mineral prospecting.