Principles Of GIS

Cost recovery or open source? Which model do you think is better one for the dissemination of public GI data?
Critically discuss the different models, referring to examples of the approach used in one or more countries.

2. Information on the geographical distribution of population is commonly provided as an attribute of discrete
polygonal aerial units, such as the Enumeration Districts or Output Areas used in many national censuses. However,
several studies have attempted to produce population surface data sets from such data. Provide an explanation as
to why it may be desirable to create population surface data sets from an initial discrete vector polygonal
representation. In your discussion, you should consider the utility of both a discrete polygonal and surface
representation of population in relation to GIS applications that may use such information.



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