There is a long history of archeological remote sensing and mapping at Angkor, and comprehensive archeological maps representing the complete water distribution network have been produced and meticulously ground verified (29, 30, 33, 46, 47). Some components of the network (such as the large southwest-northeast distributor canal from the West Baray and several roads) continued outside of the mapped area, and these were truncated at the watershed boundary (Fig. 1B).

The map was divided into 400, 7840-m2 grid squares in ArcGIS 10, and all features functionally related to the distribution of water in each grid square were given a number, a flow direction, and a dimensionless weight value, according to the coding and classification rules described below (see fig. S1). Metadata for each component (such as its type and geographical location) were also recorded.

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