Historical, county-level road network statistics for the conterminous United States (1900 - 2015)

This CSV file contains geometric and topological road network statistics for the majority of counties in the conterminous U.S. The underlying road network data is the USGS-NTD v2019. These road network data from 2019 were clipped to historical settlement extents obtained from the HISDAC-US dataset Road network statistics are multi-temporal, calculated in time slices for the years: 1810-1900, 1880-1920, 1900-1940, 1920-1960, 1940-1980, 1960-2000, 1980-2015 The historical built-up areas used to model the historical road networks are derived from historical settlement layers from the Historical settlement data compilation for the U.S. (HISDAC-US, Leyk &amp; Uhl 2018). See Burghardt et al. (2022) for details on the modelling strategy. Spatial coverage: all U.S. counties that are covered by the HISDAC-US historical settlement layers. This datasets includes around 2,700 U.S. counties. In the remaining counties, construction year coverage in the underlying ZTRAX data (Zillow Transaction and Assessment Dataset) is low. See Uhl et al. (2021) for details. All data created by Johannes H. Uhl, University of Colorado Boulder, USA. Code available at https://github.com/johannesuhl/USRoadNetworkEvolution. References: Burghardt, K., Uhl, J., Lerman, K., &amp; Leyk, S. (2022). Road Network Evolution in the Urban and Rural United States Since 1900. Computers, Environment and Urban Systems. Leyk, S., &amp; Uhl, J. H. (2018). HISDAC-US, historical settlement data compilation for the conterminous United States over 200 years. <em>Scientific data</em>, <em>5</em>(1), 1-14. DOI: https://doi.org/10.1038/sdata.2018.175 Uhl, J. H., Leyk, S., McShane, C. M., Braswell, A. E., Connor, D. S., &amp; Balk, D. (2021). Fine-grained, spatiotemporal datasets measuring 200 years of land development in the United States. <em>Earth system science data</em>, <em>13</em>(1), 119-153. DOI: https://doi.org/10.5194/essd-13-119-2021