Large-scale maps are applied where relatively high accuracy is needed over
limited areas; for example, in subdivision design and the design of engineering
projects like roads, dams, airports, and water and sewage systems. Medium scales
are often used for applications such as general preliminary planning where larger
areas are covered but only moderate accuracy is needed. Applications include
mapping the general layout of potential construction sites, proposed transportation
systems, and existing facilities. Small-scale maps are commonly used for
mapping large areas where a lower order of accuracy will suffice. They are suitable
for general topographic coverage, applications in site-suitability analysis,
preliminary layout of expansive proposed construction projects, and for special
applications in forestry, geology, environmental impact and management, etc.