Patent ID: 6633665
Filing Date: 2003-10-14
Classification: G01C

Abstract:
A method for transforming an object point in a 3D coordinate system into an image point on a linear pushbroom image captured by a linear pushbroom sensor and represented in a 2D coordinate system, comprising steps for:setting collinearity equations in relation with the object point and the image point for the linear pushbroom image; assuming an initial coordinate on a first coordinate axis in the 2D coordinate system and calculating the attitude of the linear pushbroom sensor using the initial coordinate; obtaining a temporary coordinate by solving the collinearity equation, while assuming that the linear pushbroom sensor keeps a constant attitude as calculated; calculating a differential between the initial coordinate and the temporary coordinate and comparing the differential with a given threshold; repeating the attitude calculation step through the differential comparison step after considering the temporary coordinate as the initial coordinate if the differential exceeds the given threshold; deciding on the temporary coordinate to be a final coordinate on the first coordinate axis if the differential does not exceed the given threshold; and obtaining a coordinate on a second coordinate axis in the 2D coordinate system by solving the collinearity equations using the final coordinate on the first coordinate axis.