With the available census tables (county, tract, block, zcta) and shapefiles, is it possible to identify "hotspots" of population concentration within a ZCTA?
The ZCTA gazeteer file provides the population density per square meter and square mile, but what I've been asked to do is, essentially, to put a "stick-pin" wherever there are dense clusters of people within a ZCTA, using the census data.
Is that even possible with the census data that is available? I am new to this subject but it seems the census block is the smallest granule, is that right? If the block's shape were to be spatially intersected with the ZCTA's shape, the ratio of the intersection in square meters to the block's total square meters could be used to estimate the population density of the intersection, assuming an even distribution of people throughout the block. But isn't that an unwarranted assumption?