A method of modifying geotechnically unsuitable soils at a site involving soil stabilization treatment and rolling dynamic compaction. A second image processing unit has a fixed image processing function to perform image processing of image area data. When a second transaction is attempted, the geographic location and time of the second attempted transaction is determined and, based on a comparison, an implied velocity of travel between the first and second locations is calculated. A predetermined sequence of characters included in the operation code set is identified. The catalytic converter can further include a catalytic element in the reaction chamber.