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test Choropleth map in D3
This choropleth map displays poverty estimates for US counties in 2021, with each county shaded according to its poverty rate using a blue sequential color scale and a legend with tick marks. The visualization also includes state boundary outlines overlaid on the county polygons. Built with D3 v5, the map uses `d3.json` to load TopoJSON data from the us-atlas collection and `d3.csv` to parse county-level poverty rates, then renders the geography via `d3.geoPath` and `topojson.feature`. The color encoding applies `d3.scaleThreshold` and `d3.schemeBlues`, while an axis legend is generated with `d3.axisBottom`.
AI-generated descriptionPoverty estimates for U.S., States, and counties, 2021 Source: U.S. Department of Commerce, Bureau of the Census, Small Area Income and Poverty Estimates (SAIPE) Program. For definitions of rural classifications, see the USDA, Economic Research Service webpage 'Rural Classifications' in the 'Rural Economy & Population' topic. Note that counties not existing when rural classifications were determined will not have values for those fields. Variable descriptions (column names) are found in the second tab in this workbook. This table was prepared by USDA, Economic Research Service. Data as of June 16, 2023. Contact: Austin Sanders, austin.sanders@usda.gov