edu.ucar.opensky::technotes:561 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T16:06:51.365875 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7cv4mc2 Population projections for US states under the Shared Socioeconomic Pathways based on global gridded population projections 2018-01-09T00:00:00Z publication https://n2t.org/ark:/85065/d7cv4mc2 https://doi.org/10.5065/D6930RXZ Jiang, Leiwen author Zoraghein, Hamidreza author O'Neill, Brian C. author UCAR/NCAR - Library publisher Population projections across scales are essential for integrated assessment of global environmental changes. Currently, projections at the aggregate national scale, and at the grid-cell scale, are available globally and for many individual countries. However few projections exist at intermediate scales, such as US states, which are important for capturing broad-scale redistribution of population through internal migration. We are currently developing explicit US state-level projections, from which we will create consistent gridded outcomes. Here we present a placeholder set of projections that could be used in analyses while waiting on explicit state projections. These placeholder projections are based on an existing set of global gridded projections, which we aggregate (upscale) to the state level to produce a set of projections numerically consistent at the grid cell, state and national level. We test alternative aggregation methods and geographic resolutions of the gridded population to derive the aggregate state-level projections for all 50 states (and Puerto Rico), for rural and urban areas. Results show that with high resolution gridded population data for the present population, the upscaling outcomes match reasonably well total population at the national and state levels. Comparison of the state-level projections aggregated from the grid cell level to explicit state projections from the US Census Bureau through 2030 show that results are reasonable for many states, but are much less reliable for states experiencing population dynamics differing from national overall patterns. Results therefore also demonstrate the need for a new set of alternative, state-level population projections with consistent gridded outcomes. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Population Socioeconomics theme U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2021-09-17 revision 11.2 NASA Global Change Master Directory originator Valids List: Science and Services Keywords Copyright Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation