eng Jason Nemecek USDA Natural Resources Conservation Service 2026-06-01 2026-06-01 County- and map-unit-level visualization of two USDA NRCS soil health interpretations derived from the National Cooperative Soil Survey (NCSS) SSURGO database: (1) Fragile Soil Index (FSI) — a composite measure of soil structural sensitivity to disturbance; and (2) SOH - Organic Matter Depletion — vulnerability of soil organic matter to tillage and management. Aggregation methodology: Dominant Condition. For each SSURGO map unit, the dominant interpretation class is the rating with the highest sum of major-component percentages (majcompflag = 'Yes', ordered by comppct_r DESC). County averages are area-weighted spatial intersections of map unit polygons against US Census TIGER county boundaries. Data are retrieved from the USDA SDA (Soil Data Access) REST API and refreshed on a quarterly basis following SSURGO update cycles. eng -179.15 179.78 -14.55 71.54 https://jneme910.github.io/NRCS-Soil-Data-Access/docs/soil-health-risk-map.html Regenerative Agriculture Risk Map (Interactive) https://sdmdataaccess.sc.egov.usda.gov USDA SDA (Soil Data Access) REST API — source data https://github.com/jneme910/NRCS-Soil-Data-Access Source code and build pipeline (GitHub) 1. Soil interpretation ratings (FSI class, FSI value, OM class, OM value) fetched via SDA tabular REST API using dominant-condition SQL aggregation. 2. Map unit polygon geometry fetched via SDA spatial REST API (mupolygongeo, WGS84), chunked by survey area to stay within SDA response limits. 3. County area-weighted averages computed by spatial intersection of SSURGO map unit polygon centroids against US Census TIGER/Line county boundaries. 4. Vector tiles (PMTiles format) generated by tippecanoe, zoom levels 7-10, served via GitHub Pages. 5. Update frequency: quarterly, following SSURGO update cycles. EPSG:4326 EPSG