igor-public/doc/html/PageProjections.html
matthias muntwiler 17036e1daa minor bug fixes in angle-scan import and documentation
- find attributes of region scans in angle-scan panel
- more detailed description of reduced import with regions
2018-03-13 12:43:29 +01:00

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<div id="projectname">PEARL Procedures
&#160;<span id="projectnumber">rev-distro-2.0.0-0-gfda49c3-dirty</span>
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<div id="projectbrief">Igor procedures for the analysis of PEARL data</div>
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<div class="title">Projections </div> </div>
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<div class="textblock"><p>the functions of the anglescan package support the following map projections.</p>
<p>for a description of the different projections, see, for example, <a href="https://en.wikipedia.org/wiki/Map_projection">https://en.wikipedia.org/wiki/Map_projection</a></p>
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<th align="center">Selector </th><th align="center">Projection </th><th align="center">Function </th><th align="left">Properties </th></tr>
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<td align="center">kProjDist = 0 </td><td align="center">azimuthal equidistant </td><td align="center">r = c * theta </td><td align="left">radius is proportional to polar angle. </td></tr>
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<td align="center">kProjStereo = 1 </td><td align="center">stereographic </td><td align="center">r = c * tan theta/2 </td><td align="left">circles on sphere map to circles. </td></tr>
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<td align="center">kProjArea = 2 </td><td align="center">azimuthal equal-area </td><td align="center">r = c * sin theta/2 </td><td align="left">preserves area measure. </td></tr>
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<td align="center">kProjGnom = 3 </td><td align="center">gnomonic </td><td align="center">r = c * tan theta </td><td align="left">great circles map to straight lines. </td></tr>
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<td align="center">kProjOrtho = 4 </td><td align="center">orthographic </td><td align="center">r = c * sin theta </td><td align="left">k-space mapping in ARPES and LEED. </td></tr>
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<p>the projections in this package are defined for 0 &lt;= theta &lt; 90. </p>
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