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Orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image

A satellite image and asynchronous sampling technology, applied in the field of satellite image processing, can solve the problem that the imaging geometry has not received enough attention, the geometric model of the 1B-level asynchronous sampling image has not been established, and the linear array push-broom asynchronous sampling remote sensing satellite has appeared late, etc. question

Inactive Publication Date: 2009-12-23
WUHAN UNIV
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Problems solved by technology

[0012] Since the linear array push-broom asynchronous sampling remote sensing satellite appeared relatively late, its imaging geometry has not attracted enough attention, and the geometric model of the 1B level asynchronous sampling image has not yet been established

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  • Orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image
  • Orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image
  • Orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image

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Embodiment Construction

[0027] Central projection is a widely familiar projection mode. To realize central projection, two elements must be possessed: projection center and projection surface. The light emitted from the object point passes through the projection center and forms an image on the projection surface, thereby realizing central projection. In central projection, the center of projection is a point geometrically, and optically a small hole is substituted for the small hole. Assuming that the geometric point is the intersection of two straight lines, it can be realized optically by using two intersecting slits, the projection plane remains unchanged, and the central projection still holds true. Separate the two intersecting slits in the above assumption so that they are neither parallel nor intersecting, while keeping the projection surface unchanged, the light rays emitted from the object point pass through the two slits in turn, and images can still be formed on the projection surface . ...

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Abstract

The invention discloses an orthorectification method based on geometric model of linear array push-scan asynchronous-sampling satellite image, which adopts a projective mode of double centre line projection to describe the geometrical deformation law of a linear array push-scan asynchronous-sampling satellite image; by recovering all parameters of the double centre line projection, the relationship between pixel coordinates of the satellite image and corresponding ground coordinates is established, thus realizing the orthorectification based on geometric model of linear array push-scan asynchronous-sampling satellite image; the method comprises the following steps of: (1) determining initial value of model parameters of the double centre line projection; (2) calculating error equation coefficients and resolving correction numbers of model parameters; (3) calculating a range outputting orthorectific image; (4) calculating the interpolating calculation of the gray value of grid points of the orthorectific image.

Description

technical field [0001] The invention relates to an orthorectification method, in particular to a line array push-broom asynchronous sampling satellite image orthorectification method based on double centerline projection, belonging to the field of satellite image processing. Background technique [0002] From the end of the 1990s to the present, due to the massive acquisition and distribution of high-resolution commercial remote sensing satellite images, people began to use these satellite images for geospatial data collection and database building. Satellite remote sensing images inevitably have various deformations, and geospatial databases require the elimination of deformations to obtain accurate two-dimensional or three-dimensional geospatial information. Most high-resolution optical remote sensing satellites use linear array push-broom sensors, and each line of images acquired has an independent outer orientation element, which cannot be processed by the traditional ce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G01S7/497
Inventor 龚健雅胡兴树眭海刚马国锐
Owner WUHAN UNIV
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