This example shows a hierarchical tree graph of agricultural production data from ICRISAT, grouping crop values for rice, wheat, and sorghum by Indian state and district. The visualization uses D3.js v7 with a tree layout, rendering nodes as circles with text labels and curved links as paths. The SVG canvas is 800 by 600 pixels, and the data is fetched from a remote text file, parsed with d3.csvParse, and aggregated into a nested structure using custom JavaScript processing. The visual style uses red node borders, purple text, and black links.