DOI: 10.6084/m9.figshare.19593496.v1
title: Gridded road network statistics and settlement age surfaces for core-based statistical areas in the conterminous U.S.

description: These geotiff files represent road network statistics for each core-based statistical area (CBSA) in the conterminous U.S., within grid cells of 1km x 1km. The road network statistics are based on the National transportation dataset (USGS-NTD) v2019. These statistics include: <strong>gridcell_stats_azimuthvariety_1km_all_cbsas.tif: </strong>The number of unique road angles (azimuth / orientation) in bins of 10 degrees per 1 sqkm grid cell. <strong>gridcell_stats_deadendrate_1km_all_cbsas.tif: </strong>The proportion of dead ends (nodes of degree 1) of all nodes per 1 sqkm grid cell. <strong>gridcell_stats_kmroad_1km_all_cbsas.tif: </strong>The approximate total road network length per 1 sqkm grid cell. This is based on the road segment length appended to each road segment centroid and may be biased for very long road segments. <strong>gridcell_stats_meandegree_1km_all_cbsas.tif: </strong>The average nodal degree of all nodes per 1 sqkm grid cell. <strong>gridcell_stats_meangriddedness_1km_all_cbsas.tif: </strong>The average griddedness of all nodes per 1 sqkm grid cell. <strong>gridcell_stats_nodedensity_1km_all_cbsas.tif: </strong>The number of nodes per 1 sqkm grid cell. <strong>gridcell_stats_nodesperkmroad_1km_all_cbsas.tif: </strong>The number of nodes per km road within each 1 sqkm grid cell. <strong>gridcell_stats_firstbuiltup_1km_all_cbsas.tif: </strong>The approximate settlement age per 1 sqkm grid cell. This layer is derived from the HISDAC-US First-built-up year (FBUY) layer, which is derived from Zillow's Transaction and Assessment Dataset (ZTRAX). The FBUY data is available here: Leyk, Stefan; Uhl, Johannes H., 2018, "FBUY.tar.gz", Historical settlement composite layer for the U.S. 1810 - 2015, https://doi.org/10.7910/DVN/PKJ90M/BOA5YC, Harvard Dataverse, V2 <strong>gridcell_stats_1km_all_cbsas_arcmap10.8.mxd: </strong>ESRI ArcMap 10.8 MXD file for quick visualization of the gridded surfaces. Spatial resolution: 1x1km Spatial reference: SR-ORG:7480, USA_Contiguous_Albers_Equal_Area_Conic_USGS_version Source data: USGS-NTD, HISDAC-US. File format: GeoTIFF. Spatial coverage of the road network metrics: All CBSAs in the conterminous U.S. Spatial coverage of the "first built-up year" surface: 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 Leyk & Uhl (2018) 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., & Leyk, S. (2022). Road Network Evolution in the Urban and Rural United States Since 1900. Computers, Environment and Urban Systems. Leyk, S., & 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