Leaflet Choropleth Editorial Sankey Trend Infographic

Data visualization infographic titled "Radar Spider Chart" using SANKEY FLOW as the dominant visual element to show the trend. Create a clean editorial explainer that translates the idea of a radar spider chart into a pipeline-style flow of dimensions evolving over time. Main graphic: a left-to-right sankey flow with 5 radar-style metric categories feeding through 4 time stages, with band widths changing to indicate trend progression. Use clear English labels for each stage and metric, sharp axis labels and tick marks where applicable, including a top reference scale labeled "Illustrative index score", ticks at 0, 20, 40, 60, 80, 100, and a subtitle label "Trend shown as flow width over time". Metric nodes on the left: "Speed" 58, "Accuracy" 72, "Coverage" 46, "Engagement" 61, "Stability" 54. Time-stage columns across the sankey: "2021", "2022", "2023", "2024". Show plausible illustrative flow values increasing overall across the timeline, for example total combined index 291 in 2021, 308 in 2022, 327 in 2023, 349 in 2024, with visible reallocation among categories. Include small side mini-markers or reference grid cues so the chart still feels data-rigorous and trend-oriented, with no misleading scale manipulation. Add 4 key insight callouts with small icons: 1) headline number "349" with text "Highest combined score in 2024" and an upward arrow icon, 2) headline number "+20%" with text "Total index rises from 2021 to 2024" and a trend-line icon, 3) headline number "72" with text "Accuracy starts as the strongest dimension" and a target icon, 4) headline number "+16" with text "Engagement posts one of the largest gains" and a spark icon. Add a small SOURCE / DATA-NOTE strip at the bottom reading "Data note: Illustrative example for visual demonstration. Figures are not sourced unless explicitly provided." Visual style: NYT graphics desk, restrained editorial layout, subtle annotation hierarchy, generous whitespace, thin rules, elegant typography, warm neutral background. Color palette: Economist warm beige with sand, parchment, muted terracotta, soft olive, charcoal, and desaturated blue-gray accents. Mood: analytical, trustworthy, print-newsroom sophistication. Include legend labels in English such as "Metric categories", "Time stages", and "Flow width = index score". Keep the composition vector-clean, high contrast, and easy to read. editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout. All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no fake authoritative sources cited, no watermarks Numbers labeled "illustrative" unless the user supplied specific sourced data. No fake authoritative sources cited (do not invent "Source: Reuters 2025" — use "Illustrative example" instead). No misleading axis truncation or scale manipulation.