---

FITS reader library

Javascript library for parsing FITS file

Usage

<script src="fits-reader.js"></script>  
<script>   

  function getFile(file_path) {  
  
        return fetch(file_path)  
            .then((response) => {  
                if (!response.ok) {  
                    throw new Error(`HTTP error, status = ${response.status}`);  
                } 
                return response.arrayBuffer();  
        }).then((buffer) => readFile(buffer));  
  }  
  
    function readFile(arrayBuffer) {
            //FITS file object containing the file headers and data units  
            //Library entry point expects a FITS file array buffer
	    let fits_file = window.FITSReader.parseFITS(arrayBuffer);         
		      
            //Position of the header and data unit      
            let hdu_index = 1;

	    let hdu = fits_file.getHDU(hdu_index);   
	     
	    let header = hdu.header;  
	    let data = hdu.data;  
	     
            let card_name = "CARDNAME";

	    //Get a specific card value
	    let card_value = header.get(card_name);  
	    
	    let col_name = "column";

	    //Specific to BINTABLE and TABLE extension
	    let col_data; 
	    data.getColumn(col_name, function(col){col_data = col}); 
}  

    //Get array buffer from file
    getFile("file.fits");  
  
</script>