Cartographer tom patterson, whose work ive featured previously on the map room, has added another projection to the mix, the eponymous patterson projection, a cylindrical projection which falls between the popular miller 1, which excessively exaggerates the size of polar areas, and the plate carree, which compressess the northsouth. While designing the natural earth projection, tom patterson, the author of this projection, preferred rounded corners for aesthetic reasons curves convey classic elegance jenny, patterson, and hurni 2008, 21. A computational method for the hufnagel pseudocylindric. Depending on the extent and the distortion property of the map, the application returns a list of appropriate map projections with additional projection parameters if necessary. Completed the patterson article with a paragraph about the usage as decorative map. Pdf introducing the patterson cylindrical projection researchgate. A4 projection, ciric i, cropped ginzburg viii, dedistort, hammercylindrical. This map was created from a hemisphere of the equatorial case of lamberts azimuthal equalarea projection using a trick similar to the method by which the miller cylindrical projection was made from the mercator projection.
The idea of designing a new map projection via combination of two projections is well established. It still exaggerates the polar areas but to a lesser degree than comparable projections, and preserves shapes of the land masses very well. Snyders selection guideline and on the extension to this. The natural earth ii projection has a unique shape compared to most other pseudocylindrical projections. The projection equations are simple to implement and fast to evaluate. It falls between the popular miller 1, which exaggerates the size of polar areas, and the plate carree, which compresses the mid latitudes. N2 the equal earth map projection is a new equalarea pseudocylindrical projection for world maps.
It exaggerates highlatitude areas less than the miller and compact miller projections. Best used for city maps or other small areas with map scales large enough to reduce the obvious distortion. The patterson projection is a compromise cylindrical map projection. It looks similar to the widely used robinson projection, but unlike the robinson projection, retains. August 7, 2018 the equal earth map projection is a new. The resulting goode homolosine projection is most common in. Structure solution by patterson and dual space methods.
The patterson cylindrical, a new projection designed for generalpurpose mapmaking, is an alternative to other cylindrical projections. It is neither conformal nor equalarea it was designed in flex projector, a specialized software application that offers a graphical approach for the creation of new projections. Added patterson cylindrical projection and compact miller. The equal earth map projection became one of the journals. It is inspired by the widely used robinson projection, but unlike the robinson projection, retains the relative size of areas. The map is available below as a jpeg image or pdf for quick reference and printing, or as a layered adobe illustrator cc file that you can customize. The equal earth map projection is an equalarea pseudocylindrical projection for world maps, invented by bojan savric, bernhard jenny, and tom patterson in 2018. The hammeraitoff map projection is an equalarea map projection which displays the world on an ellipse.
Savric b, patterson t, jenny b 2015b the natural earth ii world map projection. This is a summary of map projections that have articles of their own on wikipedia or that are. N out of these n2 peaks will be of zero length from each atom to itself. In general, the goal is to merge the desired characteristics of two projections, while eliminating disadvantages. New map projection meets cartographic needs and desires esri. The design process, polynomial equation and characteristics of the natural earth ii projection are described in the following section. Manual shaded relied of the world and the patterson projection. The equidistant cylindrical projection is a simple cylindrical projection that converts the globe into a cartesian grid. One construction method is to combine two source projections along a common parallel. A projected coordinate systems pdf file which contains lists of supported pcs.
Jenny and patterson 20, but the convenient user interface allowed us to. A peak marked a in figure 1 would correspond to vectors such as 89, 72, and 64. A geographic coordinate systems pdf file which contains lists of supported gcs and vcs. The equal earth map projection is a new equalarea pseudocylindrical projection for world maps. The patterson, a new projection designed for generalpurpose mapmaking, is an alternative to other cylindrical projections see comparisons below. Choose from three map projections ranging from a rectangular shape patterson to a slightly rounded shape natural earth to one that is highly rounded natural earth 2. A user study was conducted to evaluate whether mapreaders prefer the natural earth ii projection to similar compromise projections with straight parallels.
He called this an el2 series, but it is generally known as a patterson func tion56. The main users manual for proj, however, this verticaldatums working notes on the project to support vertical datums in map projections. N2 the natural earth ii projection is a new compromise pseudocylindrical projection for world maps. New world map depicts continents true to their actual size. A guide to selecting map projections for world and. Pdf the equal earth map projection is a new equalarea pseudocylindrical. The natural earth projection is a pseudocylindrical map projection designed by tom patterson and introduced in 2012. The value of the function at these maxima is proportional to the product of the implied atomic numbers, which provides a clear advantage for detecting vectors between heavy atoms, ie atoms with a large number of electrons.
Patterson has created accessible, open source data for global use natural earth, he recently contributed to a new map projection that is taking the cartography and gis world by storm. Planar projections are also called azimuthal because every planar projection preserves the property of azimuthality, directions azimuths from one or two points to all other points on the map. The natural earth ii world map projection monash university. Patterson chose bright and appealing colors for the political wall map and included light shaded relief. Equal earth map projection meets cartographic needs and. Because there is no limit to the number of possible map projections, there can be no comprehensive list. The natural earth projection is a pseudocylindrical map projection designed by tom patterson. Watch the 2018 nacis video on designing the equal earth projection. Blending world map projections bernhard jenny, oregon state university, usa tom patterson, us national park service, usa abstract. Both the physical and political maps are in the public domain which means users can freely download and use them however they want to, including for commercial purposes. Amelia, morgan city, berwick and patterson functional classification urban area map map projection 2and datum. A projection is an operation that transforms an arbitrary.
Patterson space, molecular replacement and heavy atom. The patterson function that means, a peak u, v, w in the patterson map indicates that atoms exist in the unit cell at x1, y1, z1 and x2, y2, z2 such that u x1 x2 v y1 y2 w z1 z2 thus, for n atoms in a unit cell, the patterson map will contain n peaks. The new map, called the equal earth map projection, was developed by bojan savric from the environmental systems research institute in california. Combining projections the idea of designing a new map projection by combining two existing projections is well established. We will explore where things are and why it matters and practice organizing information spatially. Before publishing a new map of a national park, pattersons team typically field checks it, saved as a geospatial pdf, using the avenza maps app on an iphone. A map is a projection of data usually from the real earth, celestial body. Patterson map is centrosymmetric, which further congests cells for noncentrosymmetric lattices. Pseudocylindrical, equalarea, bojan savric, tom patterson, bernhard jenny, 2018, inspired by the robinson projection, but retains the relative. Signal enhancement and pattersonsearch phasing for high. We refer to this draft map as we canvas the park, patterson says. This unit explores the core concepts of geography and lays the framework for basic geographical skills we will use throughout the course including map literacy, cartography, sense of place, regionalization, diffusion, globalization and sustainability.
The natural earth ii world map projection bernie jenny. This is a summary of map projections that have articles of their own on wikipedia or that are otherwise notable. Based on your findings from researching the strengths and weaknesses of certain map projections, rank the top 8 projections in your opinion. Patterson cylindrical projection compare map projections. These are not all identical and hence the peak is not circular. Added an article about the patterson cylindrical projection. Presentation at the 35th annual meeting nacis 2015, minneapolis, minnesota, october 1417. Patterson only had time, in view of the primitive computing equipment available, to determine the patterson map for one projection of potassium dihydrogen phosphate fig. A compromise aspectadaptive cylindrical projection for world maps. It is inspired by the widely used robinson projection, but unlike the robinson projection, retains the relative size of. International journal of geographical information science. Signal enhancement and pattersonsearch phasing for highspatialresolution coherent xray diffraction imaging of biological objects. Pdf introducing the patterson cylindrical projection.
The patterson projection is a very good cylindrical which should be considered whenever you need a rectangular map. But if you want a better idea of the relative size of the worlds landmasses, you need a map that distorts shape but preserves area, like the peters projection does. A polynomial equation for the natural earth projection pdf. Some of the most popular world map projections in use today were devised in this manner. Natural earth projection wikimili, the best wikipedia reader. The information provided by the maxima of the patterson function corresponds to a map of position vectors relative positions between each pair of atoms in the structure.
835 552 1067 1164 365 798 1653 126 640 144 551 30 413 423 161 1061 1273 1120 308 565 985 417 1243 1279 912 1320 37 247 1266 855 296