This proposal is complete and already merged into ECMA262 specification. See the specification text here. Thanks for help and feedback on this effort from Brendan Eich, Waldemar Horwat, Jaro Sevcik, ...
Works both in the browser and node.js, you can test the result on the demo page. It uses the EGM96 sample data file provided by the NGA to lookup reference mean sea level and performs bilinear ...
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