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Glaciers are highly sensitive indicators of climate changes. Their mass balance is an essential variable to describe their state of health together with their contribution to river runoff and sea level rise. It can be measured from high resolution earth observation satellites with stereoscopic capability. Here, we present the Pleiades Glacier Observatory (PGO) program covering 141 sites spread all over the globe and covering in total 20 000 km² of glaciers. The acquisition campaigns started in 2016 for the Northern Hemisphere and 2017 for the Southern Hemisphere and each site is revisited five years after the first acquisition. The PGO product consists of digital elevation models (DEMs) at 2 m and 20 m ground sampling distance together with 0.5 m (panchromatic) and 2 m (multispectral) ortho-images. DEMs are available to all users from an online catalog whereas images are only available after signing a license. These data are aligned with the 30 m Copernicus DEM (GLO-30) in planimetry and altimetry. Overlapping areas between DEMs are used to produce an estimation of the coregistration quality and thus demonstrate the improvement of the relative geolocalisation. As soon as acquisitions are repeated, we generate elevation difference maps. We will show the first results of our processing workflow based on stable terrain analysis to correct along and across track bias., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)