Conversion between proj4 string and WKT (without using libraries)

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I am totally new to GIS and geospatial data. But I've got to write code for the conversion between proj4 string and WKT from scratch.

I need to understand the differences between the two, data losses happening while converting from one to another(if any), mapping between them etc.

Could anyone please give a quick overview for a beginner (or any hint on where to look), before reading the two long specifications?



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