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en:documentation:projection_comparison [2013/01/13 12:55] – créée pchen:documentation:projection_comparison [2015/11/06 20:43] (current) – external edit 127.0.0.1
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 ===== Large field of view ===== ===== Large field of view =====
 +The larger field of vision make the more visual difference between the different projection.\\ 
 +The example show a field of 150° and 360° wide using the different options available in the menu [[chart_coordinates|Setup -> Chart, Coordinates]]
 ==== MER, Mercator ==== ==== MER, Mercator ====
 +150° FOV, standard and oblique :\\
 +{{:en:documentation:mer.png?300|Mercator standard}}
 +{{:en:documentation:merobl.png?300|Mercator oblique}}
 +
 +360° FOV, standard and oblique :\\
 +{{:en:documentation:mer360.png?300|Mercator standard}}
 +{{:en:documentation:mer360obl.png?300|Mercator oblique}}
  
 ==== HAI, Hammer-Aitoff ==== ==== HAI, Hammer-Aitoff ====
 +
 +150° FOV, standard and oblique :\\
 +{{:en:documentation:hai.png?300|Hammer-Aitoff standard}}
 +{{:en:documentation:haiobl.png?300|Hammer-Aitoff oblique}}
 +
 +360° FOV, standard and oblique :\\
 +{{:en:documentation:hai360.png?300|Hammer-Aitoff standard}}
 +{{:en:documentation:hai360obl.png?300|Hammer-Aitoff oblique}}
  
 ==== CAR, Cartesian ==== ==== CAR, Cartesian ====
 +150° FOV, standard and oblique :\\
 +{{:en:documentation:car.png?300|Cartesian standard}}
 +{{:en:documentation:carobl.png?300|Cartesian oblique}}
 +
 +360° FOV, standard and oblique :\\
 +{{:en:documentation:car360.png?300|Cartesian standard}}
 +{{:en:documentation:car360obl.png?300|Cartesian oblique}}
 +
 +==== ARC, full sky ====
 +When you click the "Show all sky" button{{:en:documentation:i42.png|}} the projection automatically change to the ARC full sky show below.\\
 +This same change of projection occur if you use simultaneously: an oblique projection, an azimuthal coordinate system, a very wide field of vision, and the altitude at the chart center is greater than 45°. \\
 +It return to your selected  projection if you zoom in or move the chart center nearer the horizon.
 +
 +{{:en:documentation:arcfull.png?300|}}
  
  
 ===== Small field of view ===== ===== Small field of view =====
 +On smaller field of vision the difference between the projections is more subtle but important if you want to match a specific image. \\
 +The example here show a FOV of 70° to make some difference visible at this scale, look at the grid curvature for more evidence.
  
 ==== TAN, Gnomonic  ==== ==== TAN, Gnomonic  ====
 +70° FOV :\\
 +{{:en:documentation:tan70.png|}}
  
 ==== ARC, Zenithal equidistant ==== ==== ARC, Zenithal equidistant ====
 +70° FOV :\\
 +{{:en:documentation:arc70.png|}}
  
 ==== SIN, Slant orthographic ==== ==== SIN, Slant orthographic ====
 +70° FOV :\\
 +{{:en:documentation:sin70.png|}}
  
 ==== MER, Mercator ==== ==== MER, Mercator ====
 +70° FOV, oblique :\\
 +{{:en:documentation:mer70.png|}}
  
 ==== HAI, Hammer-Aitoff ==== ==== HAI, Hammer-Aitoff ====
 +70° FOV, oblique :\\
 +{{:en:documentation:hai70.png|}}
  
 ==== CAR, Cartesian ==== ==== CAR, Cartesian ====
 +70° FOV, oblique :\\
 +{{:en:documentation:car70.png|}}
  
  
en/documentation/projection_comparison.1358078135.txt.gz · Last modified: 2015/11/06 20:33 (external edit)