Construction Schmidt net

animation demonstrating alternative use of schmidt net produce lambert equal-area projection using polar azimuth.

the schmidt net not appropriate grid representing earth s northern or southern hemisphere (because lines not correspond meridians or parallels in such projection). however, can used scalar measuring device projecting latitude-longitude points onto blank circle of same size, produce lambert equal-area projection azimuth @ north or south pole. intersection of parallels outer circle can used de facto protractor plotting point s longitude angle in polar projection. schmidt net s horizontal axis can used scalar measuring device convert point s latitude (relative pole) radial distance centre of circle. alternatively, schmidt net replaced entirely correctly projected polar grid, , grid squares map re-drawn disc.