using software Omap in village pipeline, and making DXF transfer to KML file then tracing, one village's pipeline amount is about 150, around 100 KB, large-scale village sewage pipeline in 3d modeling solution, line similar to the revit space include building water, the pipeline as accuracy, how to carry on the logic flow analysis in view of point, line, which will only be blocked, the pressure tube will be broken, and cavitation).

