{"id":"portolan-chart","no":336,"name":"Portolan Chart","ja":"ポルトラーノ海図","era":"13th–17th century","family":"図解表現","kind":"スタイル","collection":"Dictionary expansion 18","addedAt":"2026-08-18","source":{"title":"Osher Map Library","url":"https://oshermaps.org/"},"reference":{"status":"verified","pageUrl":"https://oshermaps.org/","credit":"Osher Map Library","gallery":[{"imageUrl":"https://commons.wikimedia.org/wiki/Special:FilePath/16th%20century%20Portolan%20chart%20of%20the%20Mediterranean%20Sea%20by%20Nicolas%20Bourdopolos.jpg?width=640","pageUrl":"https://commons.wikimedia.org/wiki/File:16th%20century%20Portolan%20chart%20of%20the%20Mediterranean%20Sea%20by%20Nicolas%20Bourdopolos.jpg","credit":"地中海のポルトラーノ海図 16世紀 — Wikimedia Commons / Public domain"},{"imageUrl":"https://commons.wikimedia.org/wiki/Special:FilePath/16th%20century%20Portolan%20chart%20of%20the%20Aegean%20Sea%20by%20Gaspar%20Luis%20Viegas.jpg?width=640","pageUrl":"https://commons.wikimedia.org/wiki/File:16th%20century%20Portolan%20chart%20of%20the%20Aegean%20Sea%20by%20Gaspar%20Luis%20Viegas.jpg","credit":"エーゲ海のポルトラーノ海図 — Wikimedia Commons / Public domain"},{"imageUrl":"https://commons.wikimedia.org/wiki/Special:FilePath/1375%20Atlas%20Catalan%2C%20Europe%2001.jpg?width=640","pageUrl":"https://commons.wikimedia.org/wiki/File:1375%20Atlas%20Catalan%2C%20Europe%2001.jpg","credit":"『カタルーニャ地図帳』ヨーロッパ部分 1375 — Wikimedia Commons / Public domain"}]},"essence":"羅針線が放射状に走る中世の実用海図。羊皮紙に海岸線と地名だけを精密に連ね、装飾の旗と怪物が余白を飾る。実用と装飾がまだ分かれていなかった地図の原風景。","cues":["放射する羅針線","海岸線への地名の直交列","羊皮紙の地","旗と怪物の装飾"],"intents":["信頼","懐かしさ","高揚"],"works":["航路や交易の物語を、地図の形で見せる本や展示","地名の連なりで土地の記憶を語る、装飾を伴う地図"],"recipe":{"type":"地名を海岸線に直交させて詰め、重要な港だけ赤で起こす","layout":"羅針図を数点置き、そこから直線を紙面全体へ放射させる","material":"羊皮紙色の地に黒と赤の二色。旗と怪物を海の余白へ置く"},"avoid":"羅針線を模様として引き、交点と方位の対応を無視するため、航法の図には見えなくなる。","colors":["#c1bda8","#a64a3c","#1b2c5c"],"motif":"ephemera","pair":["celestial-atlas","panoramic-map"],"study":["カタルーニャ図の系譜","羅針線の構造","国家機密としての海図"],"en":{"essence":"A medieval working sea chart, crossed by radiating rhumb lines. Coastlines and place names run precisely along the vellum while flags and monsters fill the empty water, from a time when a map's usefulness and its ornament had not yet parted.","cues":["Radiating rhumb lines","Names perpendicular to coasts","The vellum ground","Flags and monsters as ornament"],"works":["Books and exhibitions telling the story of routes or trade as a map","Ornamental maps whose real subject is the memory held in place names"],"recipe":{"type":"Names packed perpendicular to the coast, key ports raised in red","layout":"Several compass roses with straight lines radiating across the sheet","material":"Black and red on a vellum ground, flags and monsters in open water"},"avoid":"Drawing rhumb lines as pattern while ignoring how they answer the roses gives ornament that no longer looks like an instrument of navigation.","study":["the Catalan Atlas lineage","the structure of rhumb lines","charts as state secrets"]},"links":{"page":"https://indexstyle.org/styles/portolan-chart","json":"https://indexstyle.org/api/styles/portolan-chart","designSpec":"https://indexstyle.org/styles/portolan-chart/design.md","imagePrompt":"https://indexstyle.org/styles/portolan-chart/prompt.txt"},"usage":{"license":"CC-BY-4.0","licenseName":"Creative Commons Attribution 4.0 International","licenseUrl":"https://creativecommons.org/licenses/by/4.0/","attribution":"IndexStyle — https://indexstyle.org","attributionUrl":"https://indexstyle.org","scope":"Original IndexStyle text and structured data. Reference images, quoted works, and third-party material are excluded and retain their own rights."}}