#mapprojection
February 2, 2025 at 3:53 PM
November 24, 2024 at 2:15 AM
Clever #Map Shows the True #Size of Countries
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alturl.com/9nxib
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[note the ‘true’ size of high latitude landmasses like Greenland and Canada]
#GIS #spatial #mapping #projection #Greenland #Canada #mapprojection #equalarea #Mercator #nautical #navigation #spheroid #globe #equalearth #Africa
January 13, 2025 at 1:32 AM
August 25, 2025 at 7:18 PM
I still can't get this map out of my head. #dymaxionglobe #spaceshipearth
#map
#mapoftheworld
#mapprojection

#oldbirdpost
2023 02-16
September 16, 2024 at 12:51 AM
UN adopts Equal Earth map projection to address historical western bias in cartography

🤖 IA: It's not clickbait ✅
👥 Users: It's not clickbait ✅

#cartography #mapprojection #unitednations

👇👇👇
UN adopts Equal Earth map projection to address historical western bias in cartography
The United Nations has unanimously adopted the Equal Earth projection, a map design created by cartographers Tom Patterson, Bojan Šavrič, and Bernhard Jenny, to provide a more accurate representation of global landmasses. The new projection, which was proposed by Togo and approved by 164 countries, aims to correct the longstanding distortions of the Mercator projection, which has historically exaggerated the size of northern hemisphere nations while diminishing the apparent size of Africa and other southern regions. The Mercator projection, developed in the 16th century, has been criticized for reinforcing perceptions of global power dynamics by making countries like Europe and North America appear larger than they are. The UN resolution to adopt the Equal Earth projection has been met with some objections, particularly from the United States, which voted against the proposal, and from countries like Japan and Ukraine, which raised concerns about how the map's representation of disputed territories might affect geopolitical interpretations. Patterson, a US cartographer who has been working on the project since 2018, explained that the Equal Earth projection is a mathematical representation of the Earth's surface without political borders or annotations. The confusion arose from a website he maintains that includes geopolitical labels, which he has since updated to reflect current international boundaries. The cartographers emphasize that no map can be entirely neutral, as all projections involve trade-offs between accuracy, aesthetics, and usability. The Equal Earth projection is designed to balance these factors, offering a more equitable visual representation of the world's continents. Jenny, an associate professor at Monash University, noted that the UN's decision to debate map projections for an hour was a significant moment for cartographers, highlighting the growing awareness of the importance of map literacy. The resolution does not ban the Mercator projection but encourages the use of more accurate alternatives. The cartographers expressed satisfaction with the UN's decision, acknowledging that the name 'Equal Earth' likely contributed to its acceptance. They also stressed that the adoption of this projection is part of a broader effort to promote a more inclusive understanding of global geography.
en.killbait.com
September 18, 2026 at 7:55 AM
極が点となる投影法を使った方がいいな。これは正角方位図法で投影し、縦方向に 66.7% に縮小してから逆変換し、ハンメル図法で投影し、その結果を縦方向に 150% に拡大した結果。

北極と南極が同時に見えてるのが特徴。フチ付近(中心から見て裏側)の歪み具合については、もっと賢く設計すればマシになるかも知れない。(私は投影法に関してはあまり賢くない。)

#地図投影法 #mapprojection
May 22, 2025 at 5:48 AM
正距方位図法と正距円筒図法で同様の変換をした例。メルカトル図法と違って無限の彼方に吹っ飛ぶ事はない。投影の中心から見て裏側に、像がない部分が発生する。

#地図投影法 #mapprojection
May 20, 2025 at 10:43 PM
これは正角方位図法で投影し、縦方向だけ 66.7% に縮小してから逆変換し、正角円筒図法(メルカトル図法)で投影し、その結果を縦方向だけ 150% に拡大した例。赤道に沿った横の縮尺が一定になるけど、正角性を失う(各地点の拡大率が縦横で等しくならない)。

#地図投影法 #mapprojection
May 20, 2025 at 10:36 PM
こんななった :84_frog_surprised:

球面から平面へ正角方位図法で投影し、それを 66.7% に縮小してから球面へ逆変換し、それを正角円筒図法(メルカトル図法)で投影した例です。最終的にメルカトル図法なので上下に無限の長さがあるけど、北極点と南極点をそれより内側に描ける。

#地図投影法 #mapprojection
May 20, 2025 at 10:26 PM
an easy tool for finding map projections based on location. 👍https://crs-explorer.proj.org/ #mapping #mapprojection
CRS Explorer - PROJ
crs-explorer.proj.org
March 12, 2025 at 6:16 PM
Return olms ArcGIS as a layer in a method in OpenLayers
I am using OpenLayers in a project and need to bring in tiles served by ArcGIS API. I need to use olms to load the map box in to openlayers but I need to return the layer from a method. var newLayer = GenerateArcGISLayer(mapList[i].MapName, mapList[i].URL, mapList[i].MapKey, mapList[i].MapProjection, mapList[i].isDefault); I then have my method function GenerateArcGISLayer(_name, _url, _key, _projection, _isDefault) { var attributions = []; var collapsableAttributions = true; attributions: [ `Powered by Esri | `, `Sources: Esri, TomTom, Garmin, FAO, NOAA, USGS, © OpenStreetMap contributors, and the GIS User Community` ], collapsableAttributions = false; var tileGrid = osMapsTileGrid; var minZoom = 0; var maxZoom = 9; var isVisible = _isDefault.toString().toLowerCase() == "true";olms.apply(map, mapUrl) .then(() => { const source = map.getLayers().item(0).getSource(); const poweredByEsriString = "Powered by Esri | "; const attributionFn = source.getAttributions(); if (attributionFn) { source.setAttributions((ViewStateLayerStateExtent) => { return [poweredByEsriString, ...attributionFn(ViewStateLayerStateExtent)]; }); } else source.setAttributions(poweredByEsriString); }); //var _layer = new ol.layer.Tile({ // title: ' ' + _name, // visible: isVisible, // type: 'base', // source: new ol.source.OSM({ // url: _url, // attributions: attributions, // attributionsCollapsible: collapsableAttributions, // crossOrigin: 'anonymous', // //tileLoadFunction: customLoader, // maxZoom: 10, // }), // maxZoom: 10, // crossOrigin: 'anonymous', //}) //return _layer; } The commented out section at the bottom is how I do it currently with OSM but I understand I need to use olms for ArcGIS maps I am using the following url const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`; Can anyone offer any guidance please?
gis.stackexchange.com
May 16, 2025 at 7:54 AM
Anyone know a good short video/animation on map projections? Asking for a twitter-less colleague. Thanks! #maps #MapProjection #teaching
November 19, 2024 at 1:10 PM