/**
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* The maximum latitude, in radians, both North and South, supported by a Web Mercator
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* (EPSG:3857) projection. Technically, the Mercator projection is defined
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* for any latitude up to (but not including) 90 degrees, but it makes sense
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* to cut it off sooner because it grows exponentially with increasing latitude.
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* The logic behind this particular cutoff value, which is the one used by
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* Google Maps, Bing Maps, and Esri, is that it makes the projection
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* square. That is, the rectangle is equal in the X and Y directions.
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*
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* The constant value is computed as follows:
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* czm_pi * 0.5 - (2.0 * atan(exp(-czm_pi)))
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*
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* @name czm_webMercatorMaxLatitude
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* @glslConstant
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*/
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const float czm_webMercatorMaxLatitude = 1.4844222297453324;
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