A Study of Trajectory Models for Satellite Image Triangulation
265-276_07-096.qxd 2/16/10 3:36 PM Page 265 A Study of Trajectory Models for Satellite Image Triangulation In-seong Jeong and James Bethel Abstract metric camera. In common use, it generally encompasses Many Spaceborne imagery products are provided with both the internal camera geometry as well as any relevant metadata or support data having diverse types, representa- platform motions. For exploitation of a particular image, the tions, frequencies, and conventions. According to the vari- variables and parameters of that model must be assigned ability of metadata, a compatible physical sensor model numerical values, either from calibration, acquisition time approach must be constructed. Among the three components auxiliary sensors, triangulation, or some combination thereof. of the sensor model, i.e., trajectory model, projection equa- Generally, sensor models fall into two categories: models tions, and parameter subset selection, the construction of the based on the explicit physical characteristics of the system, position and attitude trajectory is closely linked with the and replacement models with generic, polynomial form availability and type of support data. In this paper, we show (RPCs), whose numerical values are obtained by means of a how trajectory models can be implemented based on support physical model. For the purposes of this paper, we will data from six satellite image types: QuickBird, Hyperion, exclude from consideration any polynomial based models SPOT-3, ASTER, PRISM, and EROS-A. Triangulation for each (rubber sheet warping) for which numerical parameters are image is implemented to investigate the feasibility and assigned without reference to a physical model. A physi- suitability of the different trajectory models.
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