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Laboratoire d’Etudes en Géophysique et Océanographie Spatiales

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by SPIRIT last modified Jul 30, 2020 03:04 PM

Data can be obtained (free of charge) at two processing levels:

 

  • Advanced users can obtained raw (“Sensor”) Pléiades stereo images from CNES / Airbus. The stereo-pair is provided with the rational polynomial coefficient (RPC) for DEM generation using open-source or commercial software.  

 
 

  • LEGOS is also distributing DEMs and ortho-images derived automatically (without ground control point) using the Ames Stereo Pipeline (ASP, Shean et al., 2016). We employ a standard set of processing parameters which proved to be efficient for snow (Marti et al., 2016) and ice (Brun et al., 2018). DEMs are distributed at different resolutions (2, 4, 10 and 30 m), including a 4-m blend DEM obtained by mosaicking the 4, 10 and 30 m DEMs. The 2-m and 4-m DEMs are provided with two different references for elevations: ellipsoidal heights above WGS84 and geoidal heights above EGM96. Two 0.5-m panchromatic and 2-m multi-spectral (RGB+Near InfraRed) ortho-images are also delivered. Users should keep in mind that Pléiades DEMs computed without ground control point have a relative accuracy of typically +/- 1 m over smooth terrain but the absolute accuracy is generally worse (Berthier et al., 2014). The whole DEM can be up to 5-10 m above or below the true earth surface and may be shifted horizontally by the same amount. It implies that proper 3D co-registration to reference data (DEM, ICESat) is mandatory.


References:

  • Berthier, E., Vincent, C., Magnússon, E., Gunnlaugsson, Á. Þ., Pitte, P., Le Meur, E., Masiokas, M., Ruiz, L., Pálsson, F., Belart, J. M. C. and Wagnon, P.: Glacier topography and elevation changes derived from Pléiades sub-meter stereo images, The Cryosphere, 8(6), 2275–2291, doi:10.5194/tc-8-2275-2014, 2014.
  • Brun, F., Wagnon, P., Berthier, E., Shea, J. M., Immerzeel, W. W., Kraaijenbrink, P. D. A., Vincent, C., Reverchon, C., Shrestha, D. and Arnaud, Y.: Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya, The Cryosphere, 12(11), 3439–3457, doi:10.5194/tc-12-3439-2018, 2018.
  • Marti, R., Gascoin, S., Berthier, E., de Pinel, M., Houet, T. and Laffly, D.: Mapping snow depth in open alpine terrain from stereo satellite imagery, The Cryosphere, 10(4), 1361–1380, doi:10.5194/tc-10-1361-2016, 2016.
  • Shean, D. E., Alexandrov, O., Moratto, Z. M., Smith, B. E., Joughin, I. R., Porter, C. and Morin, P.: An automated, open-source pipeline for mass production of digital elevation models (DEMs) from very-high-resolution commercial stereo satellite imagery, ISPRS Journal of Photogrammetry and Remote Sensing, 116, 101–117, doi:10.1016/j.isprsjprs.2016.03.012, 2016.

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