Abstract
Abstract. The use of very high resolution satellite images in photogrammetric works is increasing continuously, especially in works such as orthoimages production or Digital Elevation Models extraction. A large number of new photogrammetric uses of Earth Observation data appear due to improvement of the geometric accuracy of the products. The use of a rigorous orientation geometric model for the georeferencing of satellite image data increases the geometric potential of the photogrammetric procedure relating the satellite image to the ground point coordinates. The application of the commonly used geometric models demands the use of several control points (GCPs); the exact number of GCPs depends on the unknown parameters that need to be defined. In this paper a new rigorous orientation geometric model for pushbroom linear array sensor based on collinearity equations is described. The model uses the interior orientation parameters and orbital data; in its full version the model has 24 unknown parameters. The advantages of this model in comparison with the normal use of collinearity equations are the existence of less unknown parameters and the use of three observation equations for each observed point on the image. The scale factor in collinearity equations is not eliminated but it is modelled as a second order surface polynomial.
Highlights
1.1 High Resolution SatellitesMost satellite agencies have been oriented to launch optical satellites that have the ability to acquire stereo pair images, usually in along-track, with high resolution; WouldView-1 & 2 and GeoEye-1 are commercial satellites with ground sample distance smaller than 0.5 m
Using array detectors which are arranged in a focal plane along a line, with as long a width as possible, they can collect images with very high stability and give all parameters that are important to the photogrammetric processes, like focal length, principal point, orbital data, etc
Some of these are based on Rational Polynomial Coefficients (RPC), which are involved in metadata of images
Summary
Most satellite agencies have been oriented to launch optical satellites that have the ability to acquire stereo pair images, usually in along-track, with high resolution; WouldView-1 & 2 and GeoEye-1 are commercial satellites with ground sample distance smaller than 0.5 m. Using array detectors which are arranged in a focal plane along a line (linear array sensors - pushbroom), with as long a width as possible, they can collect images with very high stability and give all parameters that are important to the photogrammetric processes, like focal length, principal point, orbital data, etc. The use of a rigorous orientation model that allows increased accuracy in the photogrammetric process of these satellite images is very important
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