Abstract: One aspect relates to a method for reducing intermediate nodes in a polygonal chain with one or a plurality of intermediate nodes of a set of intermediate nodes between a starting node and an end node. In addition to the attributes of longitude and latitude, at least one further attribute with an attribute value and an attribute direction of a set of further attributes is assigned to the starting node, the end node and every intermediate node of the set of intermediate nodes. The attributes can be a gradient, a curve-radius or an altitude.

Abstract: One aspect relates to a method for reducing intermediate nodes in a polygonal chain with one or a plurality of intermediate nodes of a set of intermediate nodes between a starting node and an end node. In addition to the attributes of longitude and latitude, at least one further attribute with an attribute value and an attribute direction of a set of further attributes is assigned to the starting node, the end node and every intermediate node of the set of intermediate nodes. The attributes can be a gradient, a curve-radius or an altitude.

Abstract: A method for blast cleaning a solid surface using an abrasive composition of calcium carbonate, wherein the abrasive-blasting operation uses blasting apparatus including a blasting pot, a blasting hose and spray nozzle connected to the blasting pot, an air compressor and compressor air lines connected to the blasting pot, and blasting hose and spray nozzle, comprising the steps include filling the blasting pot with an abrasive composition of a coarse, medium, or fine grade of calcium carbonate, selecting a blasting spray nozzle having a specific size, adjusting the media flow valve connected to the blasting pot to set a specific blasting flow rate, setting the air pressure on the compressor air line connected to the spray nozzle, setting the air volume flow rate on the compressor air line, holding the spray nozzle a distance of 6" to 24" away from the surface to be cleaned, and moving said spray nozzle across the surface to be cleaned and wherein the above sequence of steps may be varied.