(1) Distortion by resource localization.
It is implicit in the assumptions of a triangular lattice of settlements, that the resources needed by each settlement are everywhere available—the assumption of an isotropic plane.
If, however, we take a fairly simple settlement unit, the village, and list its traditional requirements—agricultural land, water, building materials, fuel, etc
it is clear that in reality these resources are localized.
The full analysis of the minimum energy location when resources are localized must wait until the next chapter (see Section 5.6.1) but it is clear that (i) the different requirements
Figure 4.4 Stages in the classification of urban hinterlands into sector types. A Routes. B Sectors. C Classification of sectors. D Alignment with local statistical units. Source: Boguc, 1950, p. 25.