NOVELTY - The map has a single indicator representative of a supply flow pipe and a return flow pipe, where a set of circuit pipes of a pipe system e.g. return fluid flow piping system, is connected between the supply flow pipe and the return flow pipe. A set of indicators represents the circuit pipes, where each indicator is linearly placed to indicate a direction of flow of fluid e.g. water, through the pipe system, where the map is manipulated by selecting the indicators on the map based on the supply flow pipe and the return flow pipe.    USE - Linear map i.e. hierarchical tree (claimed), for visualization and building of a pipe system e.g. return fluid flow piping system and geothermal piping system, in an engineering application and a scientific application.    ADVANTAGE - The map uses a relationship between the supply flow pipe and the return flow pipe to make a set of effective building blocks to quickly and simply construct multiple models of the pipe system while allowing a set of dynamic changes to be made in the pipe system. The map uses a set of diagram elements holding a set of desired piping physical characteristics, where an arrangement of the piping system depends on a linear placement of the building blocks, thus easily solving a problem of drawing and modifying a set of diagrams as the building blocks and a set of associated relationships hold information necessary for computing a set of fluid dynamic calculations required by a user using a tool. The map uses a set of elements representing the pipes and a set of loads in a fluid dynamics piping layout and a visual interface for describing a possible geothermal field configuration including a direct return ground heat exchanger, a reverse return ground heat exchanger, a supply runout, a return runout, a manifold or vault, a circulation pump and a fitting in a better manner. The map provides a pre-defined optimization piping design for automatically and quickly creating or updating a geothermal loop design.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a two-dimensional mapping method for a piping system including a supply flow pipe and a return flow pipe.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a geothermal ground loop.    Ground heat exchanger (100)    Ground heat exchange manifold or vault (110)    Supply-return runouts (115, 135)    Ground heat exchange header (120)    Outlet (199)