Mapping of semi-arid iron bearing red sands on emerged areas around lake marshes (Tablas de Daimiel, Spain) using hyperspectral DAIS 7915 spectrometer data

A. Riaza, E. Garcia-Melendez, M. Suárez, A. Hausold, U. Beisl, H. van der Werff


Wetlands are particularly sensitive environments receiving attention from the natural sciences community due to
their wealth of both flora and fauna, and often considered as natural parks. In the Tablas de Daimiel (La Mancha,
Central Spain), Digital Airborne Imaging Spectrometer data (DAIS 7915) have been analyzed to map geological
processes on areas around the receding wetland which have never been flooded by water in the past. Sediments
permanently exposed to the atmosphere dehydrate and oxide, developing different mineralogical associations
arranged on planation surfaces. Such planation surfaces are key in the geological knowledge of recent climate
change and landscape evolution. Progressive iron oxide/hydroxide rate and decarbonation can be spectrally
followed on the Holocene sands framing the current marshy area. Such mineralogical changes are geologically
registered on flat surfaces at different heights over the receding shore of the paleolake. Interacting erosion and
sedimentation processes are responsible for the development of the flat morphological surfaces with increasing
dryness. Maps are built for four different morphological units consisting of planation surfaces following chronologically
the receding marsh during the last 2000 years before the present. Interactive spectral responses of mineralogical
associations are described on the imagery, field and laboratory spectra.


hyperspectral;iron bearing minerals;paleoclimate

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X