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< div id = "projectbrief" > Igor procedures for the analysis of PEARL data</ div >
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< div class = "headertitle" >< 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 class = "markdownTableHeadCenter" > Selector </ th >< th class = "markdownTableHeadCenter" > Projection </ th >< th class = "markdownTableHeadCenter" > Function </ th >< th class = "markdownTableHeadLeft" > Properties </ th ></ tr >
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< td class = "markdownTableBodyCenter" > kProjDist = 0 </ td >< td class = "markdownTableBodyCenter" > azimuthal equidistant </ td >< td class = "markdownTableBodyCenter" > r = c * theta </ td >< td class = "markdownTableBodyLeft" > radius is proportional to polar angle. </ td ></ tr >
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< td class = "markdownTableBodyCenter" > kProjStereo = 1 </ td >< td class = "markdownTableBodyCenter" > stereographic </ td >< td class = "markdownTableBodyCenter" > r = c * tan theta/2 </ td >< td class = "markdownTableBodyLeft" > circles on sphere map to circles. </ td ></ tr >
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< td class = "markdownTableBodyCenter" > kProjArea = 2 </ td >< td class = "markdownTableBodyCenter" > azimuthal equal-area </ td >< td class = "markdownTableBodyCenter" > r = c * sin theta/2 </ td >< td class = "markdownTableBodyLeft" > preserves area measure. </ td ></ tr >
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< td class = "markdownTableBodyCenter" > kProjGnom = 3 </ td >< td class = "markdownTableBodyCenter" > gnomonic </ td >< td class = "markdownTableBodyCenter" > r = c * tan theta </ td >< td class = "markdownTableBodyLeft" > great circles map to straight lines. </ td ></ tr >
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< td class = "markdownTableBodyCenter" > kProjOrtho = 4 </ td >< td class = "markdownTableBodyCenter" > orthographic </ td >< td class = "markdownTableBodyCenter" > r = c * sin theta </ td >< td class = "markdownTableBodyLeft" > k-space mapping in ARPES and LEED. </ td ></ tr >
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< p > the projections in this package are defined for 0 < = theta < 90. </ p >
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