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| Format: | Recurso digital |
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Zenodo
2025
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| Online Access: | https://doi.org/10.5281/zenodo.17128076 |
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Table of Contents:
- <p><strong>California Food Access (LILA-style) — 2024 (Census Tracts, 2020 boundaries)</strong></p> <p><strong>Overview.</strong> This record provides a <strong>2024</strong> update of “low access” (LA, often called “food desert” access) for California at the <strong>census-tract</strong> level on <strong>2020</strong> tracts. The method adapts USDA ERS Food Access concepts but is an <strong>independent update</strong> (not an official USDA product).</p> <p><strong>Method (summary).</strong></p> <ul> <li> <p>Analysis grid: <strong>500 m</strong> cells; distances computed from cell centroids to nearest <strong>qualifying SNAP retailer</strong>(supermarkets/large groceries).</p> </li> <li> <p>Urban/rural rule: <strong>UAC20</strong> (2020 Census Urban Areas).</p> </li> <li> <p>Thresholds: <strong>>1 mile</strong> if <strong>urban</strong>; <strong>>10 miles</strong> if <strong>rural</strong>.</p> </li> <li> <p>Aggregation: cell-level “far” population summed to <strong>tracts</strong>; outputs in <strong>EPSG:3310</strong>.</p> </li> <li> <p>Key fields:</p> <ul> <li> <p><code>far_pop_1_10_2024</code>: people farther than the 1/10-mile rule</p> </li> <li> <p><code>far_share_2024</code>: <code>far_pop / tract_pop</code></p> </li> <li> <p><code>la_2024</code>: <strong>1</strong> if <code>far_pop ≥ 500</code> <strong>or</strong> <code>far_share ≥ 0.3333</code></p> </li> <li> <p>QA fields: <code>nearest_store_dist_mi_2024</code>, <code>n_cells_2024</code>, <code>far_share_unweighted_2024</code>, <code>method_ver</code></p> </li> </ul> </li> <li> <p>Store filter: include NAICS <strong>445110</strong> / <code>store_type ∈ {Grocery Store, Supermarket, Super Store}</code> and major chains; exclude convenience, gas, dollar, pharmacy, liquor.</p> </li> <li> <p>Distance type: <strong>Euclidean</strong>. No TDLinx used.</p> </li> </ul> <p><strong>What’s included (single-layer package).</strong></p> <ul> <li> <p><strong>GeoPackage:</strong> <code>ca_food_access_2024_v1.gpkg</code> → layer <code>la_tracts_2024</code> (tract polygons + fields above)</p> </li> <li> <p><strong>GeoJSON</strong> (attributes only): <code>ca_food_access_2024_tracts.geojson</code></p> </li> <li> <p><strong>CSV</strong> (attributes only, join on <code>geoid20</code>): <code>ca_food_access_2024_tracts.csv</code></p> </li> <li> <p><strong>checksums.txt</strong> (SHA-256 for file integrity)</p> </li> </ul> <p><strong>Intended use.</strong> Mapping, public-health and planning analyses, and research that needs a current, transparent LA flag on 2020 census tracts. Results are best interpreted comparatively; Euclidean distances may understate network travel times.</p> <p><strong>Notes & limitations.</strong><br>Aggregated at tract level (no PII). Independent update; <strong>not</strong> endorsed by USDA/ERS. Differences vs. ERS Atlas arise from 2020 tracts, UAC20, SNAP-only store sources, and Euclidean distances. Low-income overlays (LILA/LILATracts) are <strong>not</strong> included in v1.0.</p> <p><strong>How to cite.</strong><br>Mendoza, G. A.; Central California Health Foundation (2025). <em>California Food Access (LILA-style) 2024 — Census Tracts (2020 boundaries).</em> v1.0.0. DOI: https://doi.org/10.5281/zenodo.17128076. CC BY 4.0.</p> <p><strong>Keywords:</strong> food access, food deserts, California, census tracts, SNAP, public health, GIS, UAC20, 2024.</p>