A computer-implemented method for ordering vertices in an image frame within a data stream, wherein the image frame corresponds to Earth-viewing data. A point of intersection of a primary pair of lines is determined and loaded into computer memory, and interrogated as to a sign of a signed remainder with respect to each of two secondary lines defined by the pairwise ordered sets of vertices. In the case of opposite remainder sign with respect to the two secondary lines, two provisional indices are swapped to obtain a rectified index for each of the four vertices. The process is repeated with respect to the signed remainder of the intersection point of the secondary lines relative to the primary lines. The four vertices are then fit, in accordance with index ordering, into a tiling of the surface of the Earth based on the rectified index of each of the four vertices.
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