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Figure 3 | International Journal of Health Geographics

Figure 3

From: Measuring the geographic coverage of methadone maintenance programme in Hong Kong by using geographic information system (GIS)

Figure 3

Spatial distribution of heroin addicts over (A) Districts; (B) TPUs. The two maps show the difference in spatial distribution of heroin addicts before and after population weighted areal interpolation. It is obvious that the TPU map presents better local variations of addiction pattern while district presents a rather raw picture of the addicts' distribution.

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