[160] | 1 | #include <iostream> |
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| 2 | #include <string> |
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| 3 | #define WCSLIB_GETWCSTAB // define this so that we don't try and redefine |
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| 4 | // wtbarr (this is a problem when using gcc v.4+ |
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| 5 | #include <fitsio.h> |
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| 6 | #include <math.h> |
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| 7 | #include <duchamp.hh> |
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| 8 | #include <Cubes/cubes.hh> |
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| 9 | |
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| 10 | int Cube::getFITSdata(string fname) |
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| 11 | { |
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[161] | 12 | /** |
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| 13 | * Cube::getFITSdata(string fname) |
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| 14 | * |
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| 15 | * This function retrieves the data array from the FITS file at the |
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| 16 | * location given by the string argument. |
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| 17 | * Only the two spatial axes and the one spectral axis are stored in the |
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| 18 | * data array. These axes are given by the wcsprm variables wcs->lng, |
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| 19 | * wcs->lat and wcs->spec. |
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| 20 | * All other axes are just read by their first pixel, using the |
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| 21 | * fits_read_subsetnull_ functions |
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| 22 | */ |
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[160] | 23 | |
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| 24 | long nelements; |
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| 25 | int bitpix,numAxes; |
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| 26 | int status = 0, nkeys; /* MUST initialize status */ |
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| 27 | fitsfile *fptr; |
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| 28 | |
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[161] | 29 | // Open the FITS file |
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[160] | 30 | status = 0; |
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| 31 | if( fits_open_file(&fptr,fname.c_str(),READONLY,&status) ){ |
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| 32 | fits_report_error(stderr, status); |
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| 33 | return FAILURE; |
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| 34 | } |
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[161] | 35 | |
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| 36 | // Read the size of the FITS file -- number and sizes of the axes |
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[160] | 37 | status = 0; |
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| 38 | if(fits_get_img_dim(fptr, &numAxes, &status)){ |
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| 39 | fits_report_error(stderr, status); |
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| 40 | return FAILURE; |
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| 41 | } |
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| 42 | long *dimAxes = new long[numAxes]; |
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| 43 | for(int i=0;i<numAxes;i++) dimAxes[i]=1; |
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| 44 | status = 0; |
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| 45 | if(fits_get_img_size(fptr, numAxes, dimAxes, &status)){ |
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| 46 | fits_report_error(stderr, status); |
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| 47 | return FAILURE; |
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| 48 | } |
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| 49 | |
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[161] | 50 | // Identify which axes are the "interesting" ones |
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[184] | 51 | int lng,lat,spc; |
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| 52 | if(this->head.isWCS()){ |
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| 53 | lng = this->head.getWCS()->lng; |
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| 54 | lat = this->head.getWCS()->lat; |
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| 55 | spc = this->head.getWCS()->spec; |
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| 56 | } |
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| 57 | else{ |
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| 58 | lng = 0; |
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| 59 | lat = 1; |
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| 60 | spc = 2; |
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| 61 | } |
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| 62 | |
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[160] | 63 | |
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| 64 | int anynul; |
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| 65 | int npix = dimAxes[lng]*dimAxes[lat]*dimAxes[spc]; |
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[161] | 66 | |
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| 67 | float *array = new float[npix]; // the array of data values |
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| 68 | char *nullarray = new char[npix]; // the array of null pixels |
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| 69 | long *inc = new long[numAxes]; // the data-sampling increment |
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| 70 | |
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| 71 | // define the first and last pixels for each axis. |
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| 72 | // set both to 1 for the axes we don't want, and to the full |
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| 73 | // range for the ones we do. |
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[160] | 74 | long *fpixel = new long[numAxes]; |
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| 75 | long *lpixel = new long[numAxes]; |
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| 76 | for(int i=0;i<numAxes;i++){ |
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| 77 | inc[i] = fpixel[i] = lpixel[i] = 1; |
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| 78 | } |
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| 79 | lpixel[lng] = dimAxes[lng]; |
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| 80 | lpixel[lat] = dimAxes[lat]; |
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| 81 | lpixel[spc] = dimAxes[spc]; |
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| 82 | |
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[161] | 83 | int colnum = 0; // want the first dataset in the FITS file |
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| 84 | |
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| 85 | // read the relevant subset, defined by the first & last pixel ranges |
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[160] | 86 | status = 0; |
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| 87 | if(fits_read_subsetnull_flt(fptr, colnum, numAxes, dimAxes, |
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| 88 | fpixel, lpixel, inc, |
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| 89 | array, nullarray, &anynul, &status)){ |
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| 90 | duchampError("getFITSdata", |
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| 91 | "There was an error reading in the data array:"); |
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| 92 | fits_report_error(stderr, status); |
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| 93 | return FAILURE; |
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| 94 | } |
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| 95 | |
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| 96 | if(anynul==0){ |
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| 97 | // no blank pixels, so don't bother with any trimming or checking... |
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| 98 | if(this->par.getFlagBlankPix()) { |
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| 99 | // if user requested fixing, inform them of change. |
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| 100 | duchampWarning("getFITSdata", |
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| 101 | "No blank pixels, so setting flagBlankPix to false.\n"); |
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| 102 | } |
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| 103 | this->par.setFlagBlankPix(false); |
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| 104 | } |
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| 105 | |
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| 106 | this->initialiseCube(dimAxes); |
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| 107 | this->saveArray(array,npix); |
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[164] | 108 | this->par.setOffsets(this->head.getWCS()); |
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[160] | 109 | //------------------------------------------------------------- |
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| 110 | // Once the array is saved, change the value of the blank pixels from |
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| 111 | // 0 (as they are set by fits_read_pixnull) to the correct blank value |
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| 112 | // as determined by the above code. |
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| 113 | for(int i=0; i<npix;i++){ |
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| 114 | // if(nullarray[i]==1) this->array[i] = blank*bscale + bzero; |
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| 115 | if(isnan(array[i])) this->array[i] = par.getBlankPixVal(); |
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| 116 | if(nullarray[i]==1) this->array[i] = this->par.getBlankPixVal(); |
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| 117 | } |
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| 118 | |
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| 119 | return SUCCESS; |
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| 120 | |
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| 121 | } |
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