Dasymetric mapping is an areal interpolation to disaggregate data from a set of areal units into finer units using ancillary data 12. These data could provide strong support for improved understanding of human-environment interactions, if more refinement was possible within the administrative units. For the conterminous US, census data are available at the county level from 1790 to 2010 (ref. Therefore, it is vital to create reliable spatially explicit, high-resolution estimates of the human population distribution to advance our understanding of coupled human and natural systems, to provide support to policy decision-making, and to achieve ecological and socioeconomic sustainability 8.Ĭensus data have been routinely collected and applied, however, such data are ascribed to defined administrative units, leading to abrupt changes in population at the administrative boundary, and masking of spatial heterogeneity within administrative units 9, 10. Human population density is considered to be a useful indicator of the type and intensity of the human environment interaction, with higher population density leading to higher levels of impacts 4– 7.
![us population density map 1840 us population density map 1840](https://i.pinimg.com/736x/3e/0b/7d/3e0b7d8f64b41a7b65171c78464a296b.jpg)
Such ecological and societal consequences vary across space. Human actions have caused substantial alterations to the Earth, transforming the landscape, affecting ecosystem patterns and processes, driving biodiversity loss, altering global hydrological and biogeochemical cycles, amplifying resource exploitation and environmental deterioration, and contributing to climate change 1– 3.
![us population density map 1840 us population density map 1840](https://www.visualcapitalist.com/wp-content/uploads/2020/08/united-states-density-map-full.jpg)
The generated gridded population datasets and the production and validation methods are described here. Separating urban and rural areas and excluding non-inhabitable areas were the most important factors for improving the overall accuracy. The models were validated with census tract and county subdivision population data in 2000 and were applied to generate five sets of 22 historical population maps from 1790–2010. Five models of increasing complexity were evaluated.
![us population density map 1840 us population density map 1840](https://vividmaps.com/wp-content/uploads/2020/08/us-median-population.jpg)
This study generated 1-km decadal population maps for the conterminous US from 1790 to 2010 using parsimonious models based on natural suitability, socioeconomic desirability, and inhabitability. However, the complex relationship between population distribution and various influencing factors coupled with limited data availability make it a challenge to reconstruct human population distribution over timescales of centuries. Where do people live, and how has this changed over timescales of centuries? High-resolution spatial information on historical human population distribution is of great significance to understand human-environment interactions and their temporal dynamics.