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. Rock glaciers are one of the most important features of the mountain permafrost in the Pyrenees. La Paul is an active rock glacier located in the north face of the Posets massif in the La Paul glacier cirque (Spanish Pyrenees). This study presents the preliminary results of the La Paul rock glacier monitoring works carried out through two geomatic technologies since 2013: Global Navigation Satellite System (GNSS) receivers and Terrestrial Laser Scanning (TLS) devices. Displacements measured on the rock glacier surface have demonstrated both the activity of the rock glacier and the utility of this equipment for the rock glaciers dynamic analysis. The glacier has exhibited the fastest displacements on its west side (over 35 cm yr−1), affected by the Little Ice Age, and frontal area (over 25 cm yr−1). As an indicator of permafrost in marginal environments and its peculiar morphology, La Paul rock glacier encourages a more prolonged study and to the application of more geomatic techniques for its detailed analysis.

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

GEOMATIC METHODS APPLIED TO THE CHANGE STUDY OF THE LA PAÚL ROCK GLACIER, SPANISH PYRENEES