ABSTRACT
Typically, the pipe data (length, diameter, age, material, etc.) and connectivity arc contained in a mapping system. Depending on the degree of automation, the quality of the source data, and the geographic accuracy required, there are several techniques available to extract the pipe data:-
Manual capture of data from a paper-based mapping system (may not require geographic coordinates). Digitisation of paper-based mapping system and attribute tagging. Rasterising (scanning) of paper-based mapping system and subsequent pipe vectorisation, followed by attnbute tagging. Extraction of attnbutes and connectivity from a Geographic Information System (GIS)
Provisional roughness values for each pipe length are determined initially by taking into account factors such as pipe material, diameter, age and condition. Details of any scraping and lining work carried out is also taken into consideration.
