International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004
n ainly due to the preliminary version of the 3D physical model
for HRS data and better results will be thus obtained with the
final version. These last results obtained over bare surfaces
better indicate the real stereo-performance for elevation
extraction and DEM generation with SPOT in- and across-track
stereo-images. Finally, when compared to other high-resolution
sensors (Toutin, 2004), better results, relatively to resolution
were obtained with SPOT-5 in- and across-track stereo
acquisitions; some of the reasons could be the use of raw data
(original geometry and radiometry) and an higher altitude with
fewer orbital perturbations.
5. CONCLUSIONS
DEMs were extracted from two different stereo acquisitions
with SPOT-5 (B/H of 0.85 for in-track and of 0.77 for across-
track) using the 3-D CCRS physical geometric model and a
multi-scale image matching. The stereo bundle adjustments of
geometric models using ten GCPs enabled a priori 3-D
restitution accuracy, which includes feature extraction error, to
be estimated: one-and-half and half-pixel for in- and across-
track stereo-pairs, respectively. However, the internal accuracy
of the stereo-models is about sub-pixel. The stereo-extracted
DEMs were then compared to accurate elevation LIDAR data,
and LE68 of 5.5 m and 6.5 m were obtained for in- and across-
track stereo-pairs, respectively. Since the surface heights were
included in terrain elevation and its evaluation, elevation errors
were thus evaluated on bare surfaces, where there is no
elevation difference between the stereo DEMs and the LIDAR
data. The results over bare surfaces (2.7 m and -2.2 m LE68 for
in- and across-track stereo-pairs, respectively) are a good
indication of the general SPOT-5 stereo-performance for DEM
generation. However, relatively to the stereo-acquisition
geometry (B/H), the results with HRG (“1/3 pixel”) were better
than the results with HRS (“1/2 pixel”). Equivalent results with
the final version of the 3D physical model for HRS data should
be thus obtained for the stereo modelling (half-pixel) and for
DEM over bare surfaces (**1/3 pixel").
ACKNOWLEDGEMENTS
The authors thank Mr. Marc Bernard and Didier Giacobbo from
SPOT-Image for the two stereo-pairs, GPR Consultants
. (Québec, Canada) for the LIDAR survey and Mr. Réjean Matte
du Ministère des Ressources naturelles du Québec, Canada for
the cartographic data. They also thank Ms. Susann Nitzsche
and Irene Walde of Hochschule fiir Technik und Wirtschaft
Dresden (FH), Germany for processing the data.
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