Abstract: The geographical coordinates of sample data and block data are transformed into the coordinates formed by the searching ellipsoid's strike direction, inclination and vertical direction.Then, the sample data and the block data in the new coordinate system are sequenced along axle direction.Finally, with the least rectangular bounding box of the search ellipsoid as the boundary, the sample data influencing the current block grade are determined by binary search algorithm, thus speeding up the grade prediction process.

Key words: Sequential scanning algorithm, Kriging prediction, Search ellipsoid, Block model, Least bounding box, GeoView, QuantyMine