https://ipums.github.io/dhs-research-hub/ Understand population health in its environmental context quarto-1.8.25 Tue, 07 Jul 2026 05:00:00 GMT Devon Kristiansen https://ipums.github.io/dhs-research-hub/posts/2026-07-07-deforestation/ Land Cover Forest Cover terra Deforestation R ggspatial sf https://ipums.github.io/dhs-research-hub/posts/2026-07-07-deforestation/ Tue, 07 Jul 2026 05:00:00 GMT Grace Cooper https://ipums.github.io/dhs-research-hub/posts/2026-06-05-distance-pt3/ ¹ which leads to poor health², is understudied in the regions that need it most, such as rural sub-Saharan Africa, due to lack of adequate road network and population data. Spatial accessibility models that account for more complex influences on spatial access, such as distance decay and supply and demand of services (i.e. gravity models such as the Two-Step Floating Catchment Area (2SFCA) model), typically depend on vector-based data that is less available in areas with the most vulnerable populations. Vector-based data include census population counts aggregated to administrative units and road network data. Global gridded population datasets (publicly available, high resolution population estimates), are becoming more widely used in social and population health studies³, however they continue to be underutilized in spatial accessibility to health models^4–6. This post describes an innovative method researchers can use to incorporate gridded population, land cover, and elevation data into a 2SFCA model for use in any region in the world, regardless of administrative data availability. ]]> Health care Accessibility Distance models Gravity models Population density Network analysis https://ipums.github.io/dhs-research-hub/posts/2026-06-05-distance-pt3/ Fri, 05 Jun 2026 05:00:00 GMT Grace Cooper https://ipums.github.io/dhs-research-hub/posts/2026-05-15-distance-pt2/ Health care Accessibility Distance models Gravity models Population density Network analysis https://ipums.github.io/dhs-research-hub/posts/2026-05-15-distance-pt2/ Fri, 15 May 2026 05:00:00 GMT Grace Cooper https://ipums.github.io/dhs-research-hub/posts/2026-03-25-health-care-distance/ Health care Accessibility Distance models Gravity models Population density Network analysis https://ipums.github.io/dhs-research-hub/posts/2026-03-25-health-care-distance/ Wed, 25 Mar 2026 05:00:00 GMT Devon Kristiansen https://ipums.github.io/dhs-research-hub/posts/2026-03-13-land-cover-pt3/ Land cover Land Use Change Dynamics Agriculture terra sf https://ipums.github.io/dhs-research-hub/posts/2026-03-13-land-cover-pt3/ Fri, 13 Mar 2026 05:00:00 GMT Devon Kristiansen https://ipums.github.io/dhs-research-hub/posts/2026-03-02-land-cover-pt2/ WRSI Agriculture Seasonality terra sf https://ipums.github.io/dhs-research-hub/posts/2026-03-02-land-cover-pt2/ Mon, 02 Mar 2026 06:00:00 GMT Devon Kristiansen https://ipums.github.io/dhs-research-hub/posts/2026-02-06-land-cover-intro/ NDVI LAI VCF Agriculture Seasonality terra sf https://ipums.github.io/dhs-research-hub/posts/2026-02-06-land-cover-intro/ Fri, 06 Feb 2026 06:00:00 GMT Devon Kristiansen https://ipums.github.io/dhs-research-hub/posts/2025-11-21-diet-diversity-ndvi/ Nutrition Integrated geography Comparable indicators Multilevel models terra sf https://ipums.github.io/dhs-research-hub/posts/2025-11-21-diet-diversity-ndvi/ Fri, 21 Nov 2025 06:00:00 GMT Rebecca Luttinen Jessie Pinchoff https://ipums.github.io/dhs-research-hub/posts/2025-10-24-forecasting-pt4/ Climate Scenarios Temperature R Nutrition Forecasts https://ipums.github.io/dhs-research-hub/posts/2025-10-24-forecasting-pt4/ Fri, 24 Oct 2025 05:00:00 GMT Rebecca Luttinen Jessie Pinchoff https://ipums.github.io/dhs-research-hub/posts/2025-09-05-forecasting-pt3/ Climate Scenarios Temperature R CHIRTS Comparison GGSPATIAL Terra SF https://ipums.github.io/dhs-research-hub/posts/2025-09-05-forecasting-pt3/ Fri, 05 Sep 2025 05:00:00 GMT Devon Kristiansen Rebecca Luttinen https://ipums.github.io/dhs-research-hub/posts/2025-08-06-intro-diet-diversity/ Nutrition Integrated geography Comparable indicators Trends terra sf https://ipums.github.io/dhs-research-hub/posts/2025-08-06-intro-diet-diversity/ Wed, 06 Aug 2025 05:00:00 GMT Rebecca Luttinen Elizabeth Heger Boyle https://ipums.github.io/dhs-research-hub/posts/2025-06-03-forecasting-pt2/ Projections Population Fertility Methodology R https://ipums.github.io/dhs-research-hub/posts/2025-06-03-forecasting-pt2/ Tue, 03 Jun 2025 05:00:00 GMT Molly Brown Rebecca Luttinen https://ipums.github.io/dhs-research-hub/posts/2025-04-23-forecasting-pt1/ Projections Scenarios Forecasts Predictions Population Methodology Research concepts https://ipums.github.io/dhs-research-hub/posts/2025-04-23-forecasting-pt1/ Wed, 23 Apr 2025 05:00:00 GMT Finn Roberts Rebecca Luttinen https://ipums.github.io/dhs-research-hub/posts/2025-03-31-viirs/ NDVI VIIRS MODIS NASA Agriculture Food production Importing Data R Reproducible workflows terra rhdf5 stringr purrr ggspatial https://ipums.github.io/dhs-research-hub/posts/2025-03-31-viirs/ Mon, 31 Mar 2025 05:00:00 GMT Kathryn Grace https://ipums.github.io/dhs-research-hub/posts/2024-12-06-qualitative-methods/ Qualitative methods Extreme weather Methodology Research concepts https://ipums.github.io/dhs-research-hub/posts/2024-12-06-qualitative-methods/ Fri, 06 Dec 2024 06:00:00 GMT Ankit Sikarwar https://ipums.github.io/dhs-research-hub/posts/2024-10-25-qgis/ GIS QGIS Open-source software CHIRTS Geoprocessing https://ipums.github.io/dhs-research-hub/posts/2024-10-25-qgis/ Fri, 25 Oct 2024 05:00:00 GMT Finn Roberts https://ipums.github.io/dhs-research-hub/posts/2024-09-30-leaflet-pt2/ Cartography Population density Urbanization Interactivity Longitudinal data R leaflet terra sf https://ipums.github.io/dhs-research-hub/posts/2024-09-30-leaflet-pt2/ Mon, 30 Sep 2024 05:00:00 GMT Finn Roberts https://ipums.github.io/dhs-research-hub/posts/2024-09-13-leaflet-pt1/ Cartography Population density Urbanization Longitudinal data R leaflet terra sf https://ipums.github.io/dhs-research-hub/posts/2024-09-13-leaflet-pt1/ Fri, 13 Sep 2024 05:00:00 GMT Grace Cooper https://ipums.github.io/dhs-research-hub/posts/2024-08-30-pop-density/ Population Population density Urbanization Data sources GRUMP GHSL LandScan WorldPop Research concepts https://ipums.github.io/dhs-research-hub/posts/2024-08-30-pop-density/ Fri, 30 Aug 2024 05:00:00 GMT Finn Roberts https://ipums.github.io/dhs-research-hub/posts/2024-08-16-ndvi-data-2/ NDVI Seasonality Climatological normals Agriculture Extreme weather Food production R Time series terra ggspatial sf https://ipums.github.io/dhs-research-hub/posts/2024-08-16-ndvi-data-2/ Fri, 16 Aug 2024 05:00:00 GMT