Population data are generally provided by state census organisations at the pre- defined census enumeration units. However, these datasets very are often required at user- defined spatial units that differ from the census output levels. A number of population estimation techniques have been developed to address these problems. This article is one of those attempts aimed at improving county level population estimates by using spatial disaggregation models with support of buildings characteristic, derived from national topographic database, and average area of a flat. The experimental gridded population surface was created for Opatów county, sparsely populated rural region located in Central Poland. The method relies on geolocation of population counts in buildings, taking into account the building volume and structural building type and then aggregation the people total in 1 km quadrilateral grid. The overall quality of population distribution surface expressed by the mean of RMSE equals 9 persons, and the MAE equals 0.01. We also discovered that nearly 20% of total county area is unpopulated and 80% of people lived on 33% of the county territory.

Immigration is one of the most contentious fields of contemporary European urban policy. While the devel-opment of urban segregation is well documented in traditional immigration countries with population reg-ister data, there is a lack of detailed research on population dynamics in many countries and cities across Europe. This article examines ethnic residential segregation in Czechia in the period after the economic crisis of 2008. Special attention is paid to the trajectories of individual cities and their position in the urban hier-archy. Longitudinal population register data are used and segregation indicators of unevenness and expo-sure are computed for the largest cities using a detailed spatial grid. The results show a broad picture of decreasing segregation despite the continuously growing number of immigrants in the country. While the economic crisis temporarily halted immigration, the spatial patterns of immigrant dissimilarity did not change and more-established immigration gateway cities experienced an increase in spatial isolation. In the conclusion, the article calls for further discussion on ethnic residential segregation in post-socialist cities.