Cahill–Keyes projection

Cahill–Keyes map of the world.
The Cahill–Keyes projection with Tissot's indicatrix of deformation.
Political World Map for CE 2012 by Duncan Webb using Cahill–Keyes projection.

The Cahill–Keyes projection is a polyhedral compromise map projection first proposed by Gene Keyes in 1975. The projection is a refinement of an earlier 1909 projection by Bernard Cahill. The projection was designed to achieve a number of desirable characteristics, namely symmetry of component maps (octants), scalability allowing the map to continue to work well even at high resolution, uniformity of geocells, metric-based joining edges, minimized distortion compared to a globe, and an easily understood orientation to enhance general usability and teachability.[1][2][3]

Construction

Diagram by Duncan Webb showing the construction of one octant of a Cahill–Keyes projection

The Cahill–Keyes projection was designed with four fundamental considerations in mind: visual fidelity to a globe, proportional geocells, 10,000 km lengths for each of its octants' three main joined edges, and an M-shape Master-Map profile. The resulting map comprises 8 octants. Each octant is an equilateral triangle with three segments per side. One side runs along the equator, and the other two run along meridians. The total length of each side is 10,043 km. The inner meridians converge towards the pole. Each 1° and 5° "tile" is proportional to each other. The specific process for constructing the graticule divides each half-octant into twelve zones, each of which has different formulae for coordinate calculations.[4]

See also

References

  1. ^ Lobner, Peter (December 23, 2016). "Polyhedral Projections Improve the Accurately of Mapping the Earth on a 2D Surface". The Lyncean Group of San Diego. Retrieved January 22, 2020.
  2. ^ Stockton, Nick (December 9, 2013). "Get to Know a Projection: Gene Keyes' 40-Year Quest for the Perfect Map". Wired. Condé Nast. Retrieved January 22, 2020.
  3. ^ Keyes, Gene (December 30, 2009). "Notes on Re-designing B.J.S. Cahill's Butterfly World Map". Retrieved January 22, 2020.
  4. ^ Gene Keyes, "Cahill-Keyes Octant Graticule: Principles and Specifications", Gene Keyes Website, 2010-08-20

Read other articles:

سفارة تركيا في واشنطن العاصمة

سفارة تركيا في الولايات المتحدة تركيا الولايات المتحدة   الإحداثيات 38°54′59″N 77°03′22″W / 38.9165°N 77.056°W / 38.9165; -77.056  البلد الولايات المتحدة  المكان واشنطن العاصمة  الاختصاص الولايات المتحدة  الموقع الالكتروني الموقع الرسمي  تعديل مصدري - تعديل   س�...

 

Torre Pellice

Torre Pellice commune di Italia Tempat Negara berdaulatItaliaRegion di ItaliaPiedmontKota metropolitan di ItaliaKota Metropolitan Turin NegaraItalia Ibu kotaTorre Pellice PendudukTotal4.575  (2023 )GeografiLuas wilayah21,1 km² [convert: unit tak dikenal]Ketinggian516 m Berbatasan denganAngrogna Luserna San Giovanni Rorà Villar Pellice SejarahSanto pelindungMartinus dari Tours Informasi tambahanKode pos10066 Zona waktuUTC+1 UTC+2 Kode telepon0121 ID ISTAT001275 Kode kadaster Italia...

 

Kali Sunter

Kali Sunter (K. Sunter) sebelah kanan bawah pada Peta Tata Air Jakarta (2012) Kali Sunter adalah sebuah sungai yang mengalir di bagian timur kota Jakarta, Indonesia,[1][2] yang memiliki aliran sungai utama sepanjang 37 km serta memiliki daerah aliran sungai seluas 73.184.092 m2.[3][4] Debit airnya adalah 83,8 mm3 saat curah hujan mencapai 100 mm.[4] Daerah aliran sungai Kali Sunter sangat padat penghuninya, dan sering terjadi banjir.[...

Lincoln Near-Earth Asteroid Research

Koordinat: 33°49′05.3″N 106°39′33.0″W / 33.818139°N 106.659167°W / 33.818139; -106.659167 Jumlah ODB yang dideteksi berbagai proyek. Proyek Lincoln Near-Earth Asteroid Research (LINEAR) adalah sebuah kolaborasi antara Angkatan Udara Amerika Serikat, NASA, dan Lincoln Laboratory dari Massachusetts Institute of Technology untuk menemukan dan melacak secara sistematis asteroid dekat Bumi. LINEAR bertanggun jawab atas sebagian besar deteksi asteroid sejak 1998 ...

 

The Gentleman's Magazine

London periodical Front page of The Gentleman's Magazine, May 1759 The Gentleman's Magazine was a monthly magazine[1] founded in London, England, by Edward Cave in January 1731.[2] It ran uninterrupted for almost 200 years, until 1922. It was the first to use the term magazine (from the French magazine, meaning storehouse) for a periodical.[3] Samuel Johnson's first regular employment as a writer was with The Gentleman's Magazine. History The original complete title wa...

 

Lavorazione con fascio elettronico

La lavorazione con fascio elettronico (dall'inglese electron-beam machining, EBM) è un processo in cui elettroni ad alta velocità sono concentrati in un fascio sottile, diretti verso il pezzo da lavorare, generando calore che vaporizza il materiale. L'EBM può essere utilizzata sia per il taglio di precisione sia per la foratura di un'ampia varietà di metalli. Rispetto ad altri processi di taglio termico, la finitura superficiale è migliore e larghezza di taglio è più stretta. A differe...

Голубянки

Голубянки Самец голубянки икар Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ПервичноротыеБез ранга:ЛиняющиеБез ранга:PanarthropodaТип:ЧленистоногиеПодтип:ТрахейнодышащиеНадкласс:ШестиногиеКласс...

 

Северный морской котик

Северный морской котик Самец Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:Синапси...

 

Valtablado del Río

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Valtablado del Río – news · newspapers · books · scholar · JSTOR (April 2024) (Learn how and when to remove this message) Place in Castile-La Mancha, SpainValtablado del RíoValtablado del RíoShow map of Province of GuadalajaraValtablado del RíoShow map of C...

VMRO-DPMNE

Macedonian political party This article has an unclear citation style. The references used may be made clearer with a different or consistent style of citation and footnoting. (July 2020) (Learn how and when to remove this message) Internal Macedonian Revolutionary Organization – Democratic Party for Macedonian National Unity Внатрешна македонска револуционерна организација – Демократска партија за македонско на�...

 

Marshall Herskovitz

American film director Marshall HerskovitzHerskovitz at George Mason University, 2008BornMarshall Schreiber Herskovitz (1952-02-23) February 23, 1952 (age 72)Philadelphia, PennsylvaniaEducationAFI ConservatoryYears active1976–presentSpouses Susan Amanda Shilladay ​ ​(m. 1981; div. 1993)​[1] Landry Major ​(m. 2015)​ Children2 Marshall Schreiber Herskovitz (born February 23, 1952)[1] is an A...

 

Val di Zoldo

Val di Zoldo Forno di Zoldo au milieu de la vallée avec le groupe Bosconero en arrière-plan. Massif Dolomites (Alpes) Pays Italie Région Vénétie Province Belluno Communes Val di Zoldo, Zoppè di Cadore, Longarone Coordonnées géographiques 46° 17′ 20″ nord, 12° 14′ 17″ est Géolocalisation sur la carte : Italie Val di Zoldo Géolocalisation sur la carte : Vénétie Val di Zoldo Orientation aval sud-est Longueur 28 km Type Vallée glacia...

1987 East Northamptonshire District Council election

1987 UK local government election 1987 East Northamptonshire District Council election[1] ← 1983 7 May 1987 1991 → All 36 seats in the East Northamptonshire District Council19 seats needed for a majority   First party Second party Third party   Party Conservative Labour Alliance Seats won 30 5 1 Seat change 1 1 Popular vote 13,429 6,210 4,839 Percentage 52.0% 24.1% 18.7% Map showing the results of the 1987 East Northamptonshire District C...

 

كأس الكؤوس الأوروبية 1982–83

يفتقر محتوى هذه المقالة إلى الاستشهاد بمصادر. فضلاً، ساهم في تطوير هذه المقالة من خلال إضافة مصادر موثوق بها. أي معلومات غير موثقة يمكن التشكيك بها وإزالتها. (نوفمبر 2019) كأس الكؤوس الأوروبية 1982–83 تفاصيل الموسم كأس الكؤوس الأوروبية  النسخة 23  التاريخ بداية:17 أغسطس 1982 ...

 

1705 English general election

1705 English general election ← 1702 7 May – 6 June 1705 1708 (GB) → elected members →All 513 seats in the House of Commons257 seats needed for a majority   First party Second party   Leader Duke of Marlborough Whig Junto Party Tory Whig Seats won 260 233 Seat change 38 49 House of Commons after election (Whigs-orange, Tories-blue) English Parliament of General Election  1705 The 1705 English general election saw contests in 110 con...

كنيس مئير طويق

كنيس مئير طويقمعلومات عامةنوع المبنى بناء ديني المنطقة الإدارية بغداد البلد  العراق معلومات أخرىالإحداثيات 33°19′21″N 44°25′01″E / 33.322557°N 44.416861°E / 33.322557; 44.416861 تعديل - تعديل مصدري - تعديل ويكي بيانات كنيس مئير طويق: أصبح مركز لتسجيل يهود العراق الراغبين بالهجرة ع�...

 

Fuerte de Buenos Aires

Acuarela que representa a El Fuerte y la playa baja, pintura de Emeric Essex Vidal (en el año 1816); notar que ya entonces flameaba la Bandera Argentina. El territorio de la playa baja fue rellenado a fines de siglo XIX y corresponde al actual Puerto Madero. El Fuerte de Buenos Aires fue una fortaleza destinada a defender Buenos Aires y a ser sede de las autoridades residentes en la ciudad. Su construcción se inició en 1595 y después de varias refacciones se finalizó recién a comie...

 

Sénat de la République romaine

Pour un article plus général, voir Sénat romain. Politique dans la Rome antique Données clés Royauté romaine753 – 509 av. J.-C. République romaine509 – 27 av. J.-C. Empire romain27 av. J.-C. – 476 Principat27 av. J.-C. – 285 Dominat285 – 476 Emp. d'Occident395 – 476 Emp. byzantin395 – 1453 MagistraturesCursus honorum Magistrats ordinaires Tribun de la plèbe QuesteurÉdilePréteur Tr. consulaireConsulCenseur Promagistrats Propréteur Proconsul Magistrats extrao...

Centre opérationnel d'urgence présidentiel

Centre opérationnel d'urgence présidentielRéunion du Conseil de sécurité nationale (NSC) au centre opérationnel d'urgence, après l'allocution de George W. Bush sur les attentats du 11 septembre 2001.PrésentationType BunkerPartie de Maison-BlancheFondation Vers 1941LocalisationLocalisation Washington  États-UnisCoordonnées 38° 53′ 51″ N, 77° 02′ 15″ Omodifier - modifier le code - modifier Wikidata Le centre opérationnel d'urgence présid...

 

1977 Canadian Grand Prix

16th round of the 1977 Formula One World Championship 1977 Canadian Grand Prix Race 16 of 17 in the 1977 Formula One season Race detailsDate October 9, 1977Location Mosport Park, CanadaCourse Permanent racing facilityCourse length 3.957 km (2.459 miles)Distance 80 laps, 316.56 km (196.72 miles)Weather Cold with temperatures approaching 12 °C (54 °F); wind speeds up to 12.8 kilometres per hour (8.0 mph)[1]Pole positionDriver Mario Andretti Lotus-FordTime 1:11.385Fastes...