Goode homolosine projection explained. The semi-major axis of the ellipsoid (sphere) is used for forward and inverse projection from grid to geodetic coordinates within the system wherein this projection is incorporated. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. Because the Mollweide is sometimes called the "homolographic projection" (meaning, equal-area map), Goode fused the two names "homolographic" and "sinusoidal" (from the sinusoidal projection) to create the name "homolosine". Goode's Interrupted Homolosine projection provides a vast improvement in shapes while maintaining equal area. +ellps, +R takes precedence. In the interrupted forms, each lobe has its own straight central An Album of Map The sinusoidal projection is used between those two latitude values for the equatorial part of the world. The Goode homolosine projection (or interrupted Goode homolosine projection) is a pseudocylindrical, equal-area, composite map projection used for world maps. There is no distortion along the central meridians and the equator. The Stereographic is constructed by projecting the earth onto a plane tangent to the surface from a point directly opposite the point of contact or the antipode (parts of the earth diametrically opposite). It is most commonly used in interrupted form. Original file (SVG file, nominally 3,600 1,568 pixels, file size: 2.52 MB). The equator and central meridian are projected as straight lines and the central meridian is 0.44 times the length of the projected equator. The parallels are straight lines, equally spaced between 4044'12'' north and south. The higher latitudes are the top sections of a Mollweide projection, grafted to the sinusoidal midsection where the scale of the two projections matches. specify radians instead, follow the value with the "r" character. It uses material from the Wikipedia article "Goode homolosine projection". The projection shows discontinuity in the graticule where both projections join. The Goode homolosine projection (or interrupted Goode homolosine projection) is a pseudocylindrical, equal-area, composite map projection used for world maps. Distortion. The EPSG code for the Web Mercator projection (used by Google Maps and Bing Maps), for example, is EPSG:3857. For example: perhaps being able to compare area across the globe is critical (i.e. Each set of assumptions and tradeoffs we create is referred to as a projection, and consists of a set of equations which convert spherical (or, in the case of Earth, ellipsoidal) coordinates into planar coordinates. And when this projection is used to map the world, complete hemispheres are commonly rendered as two circles. Comment * document.getElementById("comment").setAttribute( "id", "aec67ce2f296ef705f5d9dbff01ed861" );document.getElementById("c08a1a06c7").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Goode Homolosine. The "GoodeHomolosine" Projection has the following Parameters: Longitude of the Center of the Projection. It projects the entire Earth into a circle, though the polar regions are subject to extreme distortion. What does the Goodes projection distort? How Do You Choose The Best Candidate For A Job? From Wikimedia Commons, the free media repository, Add a one-line explanation of what this file represents. Normally it is presented with multiple interruptions. Normally it is presented with multiple interruptions. It is in the Interrupted Goode Homolosine projection. Some variants include extensions that repeat regions in two different lobes of the interrupted map in order to show Greenland or eastern Russia undivided. Interrupted forms can be used for focus maps on land or ocean as originally presented by the inventor. 2, More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. Choosing a projection appropriately to match the intent of the visualization is critical to accurately conveying information (how much distortion is OK?). Imagery is a derivative of NASA's Blue Marble summer month composite with oceans lightened to enhance legibility and contrast. J.P.. 1925. Size of this PNG preview of this SVG file: Add a one-line explanation of what this file represents. This projection presents the global land masses with minimal interruption and minimal overall shape distortion. Cookie policy. The result is a slight, visible bend in the meridians at 4044'11.8'' N and S. When marked with [], sizes with and without background are approx. We would like to show you a description here but the site won't allow us. The following pages on the English Wikipedia use this file (pages on other projects are not listed): (2,058 900 pixels, file size: 519 KB, MIME type: Commons is a freely licensed media file repository. Your email address will not be published. It was developed by J. Paul Goode in 1923 as a merging of the Mollweide (or Homolographic) and Sinusoidal Projections, thus giving rise to the name Homolosine. Specified in [square brackets]: Actual size of the projection (minus the black or white background). the same. Normally it is presented with multiple interruptions. Its equal-area property makes it useful for presenting spatial distribution of phenomena. The sinusoidal projection is used between those two latitude values for the equatorial part of the world. This means that when we attempt to flatten our round planet to the two-dimensional plane of websites and journal articles, we make certain assumptions based on the intent we've set for our map. Forward and inverse, spherical projection. Goode homolosine projection synonyms, Goode homolosine projection pronunciation, Goode homolosine projection translation, English dictionary definition of Goode homolosine projection. Its straight, parallel meridians allow angle measurement with a protractor. For an ellipsoid, the semimajor axis is used for the radius. Both projections are equal area and pseudocylindrical. Japanese architect Hajime Narukawa invented this projection in 1999 by equally dividing a spherical surface into 96 triangles. The Mollweide projection is used for north of 40 44' and south of -40 44', approximately. Goode homolosine is an equal-area (equivalent) projection. Map projections are interesting, complicated, and mostly handled for us. Each of these projections has been assigned a code by the European Petroleum Survey Group (EPSG), which has established itself as a projection authority. Its principal disadvantage is that distances are greatly distorted Greenland appears larger than South America when its actually one-ninth the size. Central Meridian, which does not alter the interruption longitudes as specified by the Option parameter. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. Files are available under licenses specified on their description page. The equal-area property and some other distortion properties are not maintained when an ellipsoid is used. Learn a new word every day. +R=<value>. Goode. The Goode homolosine projection (or interrupted Goode homolosine projection) is a pseudocylindrical, equal-area, composite map projection used for world maps. An advantage of this projection is that it does not exaggerate distance and area as much as the Mercator projection. Radius of the sphere, given in meters. How do map projections work? Goode's homolosine projection is a combination of the Mollweide and sinusoidal projections. This means that when we attempt to flatten our round planet to the two-dimensional plane of websites and journal articles, we make certain assumptions based on the intent weve set for our map. All parameters are optional for the Goode Homolosine projection. The scale along all parallels in the sinusoidal part, between 40xb044'12" north and south, and along the central meridians of the projection is accurate. You must there are over 200,000 words in our free online dictionary, but you are looking for one thats only in the Merriam-Webster Unabridged Dictionary. If you think this file should be featured on Wikimedia Commons as well, feel free to nominate it. The scale is correct along the 4044 north and south parallels and constant along any given parallel. Normally it is presented with multiple interruptions. A conformal map distorts areamost features are depicted too large or too small. Cal Coop Ocean Fish Invest Lines/Stations, Interrupted Goode Homolosine (Oceanic View), Gauss-Schreiber Transverse Mercator (aka Gauss-Laborde Reunion), Computation of coordinate operations between two CRS. It is. I would like to use Goode's Homolosine projection with GeoTools. How Were Presidents Theodore And Franklin Roosevelt Relate? Have you signed up for ourmonthly e-newsletter? Goode homolosine is an equal-area (equivalent) projection. Image created with the Geocart map projection software. The Goode homolosine projection (or interrupted Goode's homolosine projection) is a pseudo- cylindrical, equal-area, composite map projection used for world maps. Delivered to your inbox! Points 4044 north and south at the central meridian have zero distortion. Frequently plotted with some northern regions repeated on different interrupted sections to reduce . However, shapes still stretch severely at the perimeter. Revision 0908dd5c. mapserver. You can explore projections and find your neighborhoods favorite at http://epsg.io, which is also the database cartopy uses to lookup projections by their EPSG codes. Accessed 28 Jun. All structured data from the file namespace is available under the. The Goode Homolosine projection is a pseudocylindrical composite projection that is equal area. Fortunately, much of the work to manage these map projections, at least in Python, has been done for us. Flattening the Earth. An advantage of this projection is that it does not exaggerate distance and area as much as the Mercator projection. Its equal-area property makes it useful for presenting spatial distribution of phenomena. This page was last edited on 30 August 2022, at 17:41. In the uninterrupted form, bulging meridians produce considerable shape distortion toward the edge of the projection. I recently posted about a problem in ArcGIS using the Goode Homolosine (Land) projection with the Project Raster tool HERE. Each of these projections has been assigned a code by the European Petroleum Survey Group (EPSG), which has established itself as a projection authority. In the uninterrupted form, bulging meridians produce considerable shape distortion toward the edge of the projection. Goodes Interrupted Homolosine projection provides a vast improvement in shapes while maintaining equal area. This page is not available in other languages. A Stereographic projection is a true perspective projection that has been popular since the 16th century. AuthaGraph. I, the copyright holder of this work, hereby publish it under the following license: Add a one-line explanation of what this file represents. In the next episode in this tutorial well use cartopy to help turn a standard Python plotting tool into a powerful, projection-aware mapping utility. Goode homolosine is a pseudocylindric projection. Error message | View complete answer on https://geo.libretexts.org What is the problem with the Goode homolosine projection? meridian 0.22 times as long as projected equator. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. Other Meridians: Equally spaced sinusoidal curves between the 4044'11.8'' parallels and elliptical arcs elsewhere, all concave toward the central meridian. The poles are presented as points. By using interruption, selected parts of the map like land formations can be kept centered, further diminishing distortion. The amount of distortion, however, is regular along some lines in the map. Scale is true along every latitude between 4044' N and S and along the central meridian within the same latitude range. Other meridians are equally spaced sinusoidal curves between latitudes 4044' N and S. The poles are represented by points. Snyder, J. P. and Voxland, P. M. (1989). Advantages: It was made famous when the National Geographic Society adopted it as their reference map of the world from 1922 until 1988. Option, used to specify the interruption forms regardless of Central Meridian parameter value, with values as follows. It is a combination of Mollweide (or homolographic) and sinusoidal projections, hence the name homolosine. Two Thousand Years The graticule is symmetric across the equator and the central meridian. Shapes, directions, angles, and : a conformal map projection of which the meridians are usually drawn parallel to each other and the parallels of latitude are straight lines whose distance from each other increases with their distance from the equator. Note. Your email address will not be published. Those spherical coordinates I mention above are referencing a location on a sphere (or, in the case of Earth, an elipse), and as such they have to be in reference to some definition of that sphere. Shapes, directions, angles, and distances are generally distorted. a two-cm square anywhere on our paper map has the same surface area on the globe), or perhaps preserving the real shapes of landmasses is important. See Projection Units for more information. The Mollweide projection is used north and south of the 4044'12'' parallels. land-oriented version, the straight meridians are across the equator and the central meridian. AuthaGraph This article is licensed under the GNU Free Documentation License. First create a file called gl-goodes-deciduous.vrt that looks like this:
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