The small-area estimation developed by Elbers, Lanjouw and Lanjouw (2002, 2003), in
which a census and a survey are combined to produce the estimates of welfare measures
for small geographic areas, has become a standard tool for poverty analysis in
developing countries. The small-area estimates are typically plotted on a map, which
are commonly called a poverty map. Poverty maps proved useful for policy analysis
and formulation, and have become increasingly popular among policy-makers and
researchers. In Cambodia, poverty maps have been used by various international
organizations, ministries and non-governmental organizations for analyzing the
poverty situations for their operation areas, selecting the potential locations for their
projects and programs, and educating students in classrooms (Fujii, 2007).