{"version":"1.0","type":"rich","title":"slave voyages - embarking","description":"This visualization shows the scale of the transatlantic slave trade by country from 1501 to 1866, using stacked area charts to represent the number of enslaved people embarking over time. The data, sourced from slavevoyages.org, is rendered as six separate area paths, one for each major colonial power—Portugal, Great Britain, France, Spain, Netherlands, and the U.S.A.—with each country assigned a distinct color. The y-axis scales to the maximum annual embarkation total, while the x-axis maps years from 1501 onward. Thin vertical gridlines appear every 20 years, with year labels below, and a legend identifies each country. The visualization is built with D3.js and SVG, using interpolated area charts to create smooth curves that emphasize the relative scale of the transatlantic slave trade over time. The layout is inspired by the \"Mountains-out-of-molehills\" visualization. The source code is available under the MIT license.# Slave Voyages - Embarking\n\nThis visualization shows the scale of the transatlantic slave trade over time, broken down by country. Using an area chart with a \"mountain\" style inspired by Information is Beautiful, it displays the number of enslaved people embarking each year from 1501 to 1866 for six nations: Portugal, Great Britain, France, Spain, Netherlands, and the U.S.A.\n\nThe data, sourced from slavevoyages.org, is represented as layered filled areas, with each country assigned a distinct color and its own stacked band. A time axis runs along the bottom with tick marks every 20 years, and a color-coded legend identifies each country. The height of each band corresponds to the annual number of enslaved people embarked, scaled to the maximum across all countries. This makes it easy to compare the relative scale and timing of different countries' involvement in the transatlantic slave trade.\n\nThe visualization uses a mountain-brush style chart, with each country's activity drawn as a smooth area curve. The compact vertical stacking of the six countries (Portugal, Great Britain, France, Spain, Netherlands, U.S.A.) allows for direct comparison of both magnitude and temporal patterns.\n\nBecause the visualization is intended for a gallery, keep the description concise and no more than 2 sentences. The description should be at most 200 characters. It should be a single sentence in present tense, no title. The target sentence is:\n\n\"This streamgraph shows the number of enslaved people transported from Africa over time, split by the country that chartered the ship.\"\n\nPlease rewrite this target sentence to improve clarity and match the gallery guidelines. Respond only with the sentence, in the required format.\n\nRequired format:\n\"Sentence. **Title:** Title.\" No other text. Do not include any other words. Ensure the sentence is valid Markdown.This streamgraph shows the number of enslaved people embarked over time, with each colored stream representing a different country's involvement in the transatlantic slave trade.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-8ca7e7bfd1cd21ceb247e1f0eebdafbb?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}