The San Diego Association of Governments (SANDAG) has produced small area population estimates for San Diego County since 1984. SANDAG uses the housing unit method of population estimation and controls small area estimates (i.e. census tract level or smaller) to January 1 city and county population totals published by the California Department of Finance (DOF) in May each year. Because the small area estimates are based on housing unit counts, it is important to get the most accurate and timely data available.
Originally SANDAG produced estimates at the census tract level. Later a splittract geography was introduced so that estimates could be produced for cities, zip codes, school districts, and other political and administrative areas by aggregating estimates for the split tracts. The next progression was to split blocks to allow the compilation of estimates for more customized areas within the county. From split blocks, the natural evolution was to producing estimates at an even smaller geography: the parcel. Parcels are individual house- or business-lots that are tracked by a tax assessor for ownership and taxation purposes. Currently SANDAG produces housing unit and group quarters population estimates at the parcel level. Plans are to develop household population and characteristics estimates at the parcel level using microsimulation techniques.
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Jarosz, B. (2008). Using Assessor Parcel Data to Maintain Housing Unit Counts for Small Area Population Estimates. In: Murdock, S.H., Swanson, D.A. (eds) Applied Demography in the 21st Century. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8329-7_5
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