Rectangular polyconic projection: Difference between revisions

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*''φ''{{sub|0}} is the latitude chosen to be the origin along ''λ''{{sub|0}};
*''φ''{{sub|1}} is the latitude whose parallel is chosen to have correct scale.
To avoid division by zero, the formulas above are extended so that if ''φ'' = 0 then ''x'' = ''2A'' and ''y'' = −''φ''{{sub|0}}. If ''φ''{{sub|1}}= 0 then ''A'' = ½{{sfrac|1|2}}(''λ'' − ''λ''{{sub|0}}).
 
==See also==