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(Note that this is still a woefully incomplete account of all the features of the library...work in progress.)
FITS File interaction written in Visual Studio C# .Net, compatible across all .Net platforms.
JPFITS is not based upon any other implementations and is written from the ground-up, consistent with the FITS standard, designed to interact with FITS files as object-oriented structures.
JPFITS provides functionality to interact with FITS images and binary table extensions, as well as providing common mathematical methods for the manipulation of data, data reductions, profile fitting, photometry, etc.
JPFITS also implements object-oriented classes for Point Source Extraction, World Coordinate Solutions (WCS), and WCS automated field solving, etc.
The world coordinate solver is based on the trigonometric algorithm as described here:
https://iopscience.iop.org/article/10.1088/1538-3873/ab7ee8
All function parameters, methods, properties, etc., are coded with XML descriptions which will function with Visual Studio. Other code editors may or may not read the XML files.
Everything which is reasonable to parallelize in order to benefit from the computation speed increase for multi-threaded systems has been done so. In all such cases function options are given in order to specify the use of parallelism or not. Generally, most image manipulation functions are highly amenable to parallelism. No parallelism is forced, i.e., any code which may execute parallelized is given a user option to do so or not.