| Titre | Spatiotriangulation with multisensor VIR/SAR images |
| Télécharger | Téléchargements (Prétirage) |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Toutin, T |
| Source | IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers) vol. 42, issue 10, 2004 p. 2096-2103, https://doi.org/10.1109/TGRS.2004.834638 |
| Année | 2004 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20043277 |
| Éditeur | Institute of Electrical and Electronics Engineers (IEEE) |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1109/TGRS.2004.834638 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Région | Montagnes Rocheuses |
| Sujets | télédétection; établissement de modèles; imagerie par satellite; techniques de cartographie; géophysique |
| Illustrations | images satellitaires; tableaux; organigrammes |
| Résumé | (disponible en anglais seulement)
The objectives of this research study was to evaluate the spatiotriangulation applied to multi-sensor satellite images, which enabled the simultaneous geometric
processing of a large number of images and strips together to reduce the control point requirement. The spatiotriangulation is based on the three-dimensional physical models developed for multi-sensor images at the Canada Centre for Remote Sensing,
Natural Resources Canada and on a least-squares block bundle adjustment process with orbital constraints. The spatiotriangulation was applied to 49 images in six blocks (Landsat-7 ETM+, panchromatic SPOT-4 HRV, multi-band ASTER, multi-mode radar
RADARSAT-1 and ERS-1) acquired over the Rocky Mountains, Canada from different viewing/look angles. The first results of least-squares block bundle adjustments showed that the same error residuals (around 20 m) were obtained with the different image
blocks whether independently or simultaneously processed. In addition to ground control points (GCPs), elevation tie points (ETPs), with a known elevation value, instead of normal tie points were used in the overlaps because the viewing/look-angle
differences of overlapping images were generally small (8º). The second and most important results were related to simultaneous bundle adjustments of the larger masterLandsat-7 block (600 x 500 km) using 25 GCPs in the two outer strips and the
smaller slaveblock(s) using no GCP but only ETPs. The errors, verified by a large number of independent check points (ICPs) in the slaveblocks, were between 15 m and 35 m (1.5-2 resolutions) depending of the slaveblock. However, the combined image
pointing and map errors of ICPs (25-30 m) are included in these 15-35 m error results and the internal accuracy of the blocks should thus be better (around one resolution). The research study demonstrated thus the possibility to use the largest block
with a reduced number of GCPs to simultaneously adjust single image(s)/strip(s) or smallest block(s) with only ETPs, and with no degradation in the accuracy. |
| GEOSCAN ID | 220079 |
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