Girasol, a sky imaging and global solar irradiance dataset
Data files
Dec 28, 2020 version files 118.47 GB
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2017_12_08.zip
398.58 MB
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2017_12_09.zip
397.67 MB
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2017_12_10.zip
401.36 MB
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2017_12_11.zip
412.70 MB
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2017_12_12.zip
397.91 MB
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2017_12_13.zip
397.53 MB
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2017_12_15.zip
396.45 MB
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2017_12_16.zip
399.42 MB
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2017_12_17.zip
400.11 MB
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2017_12_18.zip
245.91 MB
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2017_12_19.zip
396.55 MB
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2017_12_20.zip
396.25 MB
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2017_12_21.zip
397.53 MB
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2017_12_22.zip
400.07 MB
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2017_12_23.zip
395.67 MB
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2017_12_25.zip
313.46 MB
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2017_12_26.zip
402.82 MB
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2017_12_27.zip
406.73 MB
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2017_12_28.zip
399.07 MB
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2017_12_29.zip
403.37 MB
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2017_12_30.zip
396.95 MB
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2017_12_31.zip
406.87 MB
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2018_01_01.zip
401.35 MB
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2018_01_02.zip
409.85 MB
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2018_01_03.zip
418.30 MB
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2018_01_04.zip
371.62 MB
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2018_01_05.zip
409.92 MB
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2018_01_06.zip
406.48 MB
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2018_01_07.zip
411.24 MB
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2018_01_08.zip
417.95 MB
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2018_01_09.zip
421.13 MB
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2018_01_10.zip
263.64 MB
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2018_01_11.zip
417.28 MB
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2018_01_12.zip
419.48 MB
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2018_01_13.zip
420.89 MB
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2018_01_14.zip
422.11 MB
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2018_01_15.zip
431.85 MB
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2018_01_16.zip
285.62 MB
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2018_01_17.zip
427.54 MB
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2018_01_19.zip
443.73 MB
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2018_01_20.zip
427.77 MB
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2018_01_21.zip
296.19 MB
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2018_01_22.zip
427.65 MB
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2018_01_23.zip
431.80 MB
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2018_01_24.zip
431.64 MB
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2018_01_25.zip
435.76 MB
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2018_01_26.zip
440.62 MB
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2018_01_27.zip
438.08 MB
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2018_01_28.zip
445.92 MB
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2018_01_29.zip
448.32 MB
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2018_01_30.zip
464.95 MB
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2018_01_31.zip
449.68 MB
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2018_02_01.zip
465.48 MB
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2018_02_02.zip
451.15 MB
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2018_02_03.zip
456.60 MB
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2018_02_04.zip
472.85 MB
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2018_02_07.zip
442.30 MB
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2018_02_08.zip
447.98 MB
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2018_02_09.zip
453.54 MB
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2018_02_10.zip
452.49 MB
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2018_02_11.zip
453.01 MB
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2018_02_12.zip
450.60 MB
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2018_02_13.zip
484.86 MB
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2018_02_14.zip
380.55 MB
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2018_02_15.zip
350.97 MB
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2018_02_16.zip
371.30 MB
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2018_02_17.zip
487.71 MB
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2018_02_18.zip
452.97 MB
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2018_02_19.zip
439.98 MB
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2018_02_20.zip
413.50 MB
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2018_02_21.zip
478.49 MB
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2018_02_22.zip
443.47 MB
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2018_02_23.zip
484.67 MB
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2018_02_24.zip
490.65 MB
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2018_02_25.zip
491.96 MB
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2018_02_26.zip
492.80 MB
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2018_03_01.zip
492.47 MB
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2018_03_02.zip
495.48 MB
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2018_03_03.zip
498.36 MB
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2018_03_04.zip
503.72 MB
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2018_03_05.zip
513.99 MB
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2018_03_06.zip
528.55 MB
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2018_03_07.zip
497.81 MB
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2018_03_09.zip
546.57 MB
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2018_04_02.zip
580.48 MB
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2018_04_03.zip
580.75 MB
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2018_04_04.zip
582.13 MB
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2018_04_05.zip
578.55 MB
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2018_04_06.zip
551.86 MB
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2018_04_07.zip
593.97 MB
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2018_04_08.zip
591.43 MB
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2018_04_09.zip
587.70 MB
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2018_04_10.zip
597.54 MB
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2018_04_11.zip
591.38 MB
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2018_04_12.zip
579.15 MB
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2018_04_13.zip
570.54 MB
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2018_04_15.zip
571.08 MB
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2018_04_16.zip
548.86 MB
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2018_04_18.zip
566.50 MB
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2018_04_19.zip
584.47 MB
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2018_04_20.zip
598.84 MB
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2018_04_21.zip
589.20 MB
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2018_04_22.zip
622.74 MB
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2018_04_23.zip
592.07 MB
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2018_05_14.zip
597.73 MB
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2018_05_15.zip
620.86 MB
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2018_05_16.zip
609.27 MB
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2018_05_17.zip
621.48 MB
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2018_05_18.zip
610.01 MB
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2018_05_19.zip
613.69 MB
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2018_05_20.zip
621.70 MB
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2018_05_21.zip
572.05 MB
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2018_05_22.zip
629.13 MB
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2018_05_23.zip
624.72 MB
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2018_05_24.zip
620.46 MB
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2018_05_26.zip
540.33 MB
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2018_06_06.zip
628.80 MB
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2018_06_07.zip
616.37 MB
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2018_06_08.zip
616.46 MB
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2018_06_09.zip
633.46 MB
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2018_06_10.zip
625.07 MB
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2018_06_11.zip
623.05 MB
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2018_06_12.zip
622.89 MB
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2018_06_13.zip
642.26 MB
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2018_06_14.zip
617.53 MB
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2018_06_15.zip
618.57 MB
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2018_06_22.zip
582.11 MB
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2018_06_23.zip
582.22 MB
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2018_06_24.zip
606.97 MB
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2018_06_25.zip
654.04 MB
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2018_06_30.zip
703.56 MB
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2018_07_01.zip
671.98 MB
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2018_07_02.zip
674.34 MB
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2018_07_04.zip
636.10 MB
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2018_07_08.zip
641.28 MB
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2018_07_09.zip
673.95 MB
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2018_07_10.zip
672.41 MB
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2018_07_11.zip
666.05 MB
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2018_07_12.zip
691.05 MB
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2018_07_13.zip
630.85 MB
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2018_07_14.zip
647.03 MB
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2018_07_15.zip
659.53 MB
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2018_07_18.zip
662.25 MB
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2018_07_19.zip
649.72 MB
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2018_07_20.zip
665.20 MB
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2018_07_21.zip
667.81 MB
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2018_07_22.zip
666.16 MB
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2018_07_24.zip
683.97 MB
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2018_07_25.zip
671.94 MB
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2018_08_09.zip
451.26 MB
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2018_08_22.zip
594.28 MB
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2018_08_23.zip
633.74 MB
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2018_08_24.zip
618.29 MB
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2018_08_25.zip
614.55 MB
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2018_08_26.zip
627.41 MB
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2018_08_27.zip
630.29 MB
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2018_08_28.zip
634.66 MB
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2018_08_29.zip
620.97 MB
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2018_08_30.zip
648.21 MB
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2018_09_01.zip
539.44 MB
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2018_09_02.zip
631.92 MB
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2018_09_03.zip
601.15 MB
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2018_09_04.zip
616.93 MB
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2018_09_05.zip
599.86 MB
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2018_09_12.zip
580.13 MB
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2018_09_13.zip
582.09 MB
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2018_09_14.zip
579.94 MB
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2018_09_15.zip
573.31 MB
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2018_09_16.zip
589.41 MB
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2018_09_17.zip
567.02 MB
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2018_09_18.zip
561.47 MB
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2018_09_19.zip
571.64 MB
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2018_09_20.zip
512.83 MB
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2018_09_21.zip
544.67 MB
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2018_09_22.zip
539.64 MB
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2018_09_23.zip
535.50 MB
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2018_10_09.zip
499.60 MB
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2018_10_10.zip
524.62 MB
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2018_10_11.zip
513.73 MB
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2018_10_12.zip
523.46 MB
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2018_10_13.zip
525.32 MB
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2018_10_14.zip
438.09 MB
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2018_10_15.zip
427.71 MB
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2018_10_16.zip
459.31 MB
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2018_10_17.zip
492.83 MB
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2018_10_18.zip
349.43 MB
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2018_10_19.zip
492.30 MB
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2018_10_21.zip
491.77 MB
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2018_10_22.zip
494.90 MB
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2018_10_23.zip
411.30 MB
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2018_11_02.zip
443.94 MB
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2018_11_03.zip
447.49 MB
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2018_11_04.zip
450.01 MB
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2018_11_05.zip
436.84 MB
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2018_11_06.zip
431.53 MB
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2018_11_07.zip
430.67 MB
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2018_11_08.zip
427.39 MB
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2018_11_15.zip
376.24 MB
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2018_11_16.zip
374.11 MB
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2018_11_17.zip
378.50 MB
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2018_11_18.zip
379.15 MB
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2018_11_22.zip
297.57 MB
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2018_11_23.zip
430.32 MB
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2018_11_24.zip
426.11 MB
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2018_11_27.zip
421.76 MB
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2018_11_28.zip
425.04 MB
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2018_11_30.zip
321.66 MB
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2018_12_01.zip
411.14 MB
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2018_12_02.zip
333.08 MB
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2018_12_03.zip
417.18 MB
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2018_12_04.zip
416.28 MB
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2018_12_07.zip
353.20 MB
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2018_12_11.zip
396.92 MB
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2018_12_12.zip
408.72 MB
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2018_12_13.zip
406 MB
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2018_12_15.zip
396.62 MB
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2018_12_16.zip
412.39 MB
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2018_12_17.zip
301.41 MB
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2018_12_18.zip
403.92 MB
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2018_12_19.zip
401.98 MB
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2018_12_20.zip
396.80 MB
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2018_12_21.zip
411.25 MB
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2018_12_22.zip
400.04 MB
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2018_12_23.zip
383.10 MB
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2018_12_24.zip
400.51 MB
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2018_12_25.zip
356.02 MB
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2018_12_26.zip
285.70 MB
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2018_12_27.zip
361.66 MB
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2019_01_08.zip
416.50 MB
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2019_01_09.zip
400.33 MB
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2019_01_10.zip
364.02 MB
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2019_01_11.zip
310.50 MB
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2019_01_12.zip
380.96 MB
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2019_01_13.zip
294.78 MB
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2019_01_14.zip
396.04 MB
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2019_01_15.zip
357.04 MB
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2019_01_16.zip
433.79 MB
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2019_01_17.zip
430.80 MB
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2019_01_18.zip
385 MB
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2019_01_19.zip
430.82 MB
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2019_01_20.zip
442.12 MB
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README.txt
2.36 KB
Abstract
The energy available in Micro Grid (MG) that is powered by solar energy is tightly related to the weather conditions in the moment of generation. Very short-term forecast of solar irradiance provides the MG with the capability of automatically controlling the dispatch of energy. We propose to achieve this using a data acquisition systems (DAQ) that simultaneously records sky imaging and Global Solar Irradiance (GSI) measurements, with the objective of extracting features from clouds and use them to forecast the power produced by a Photovoltaic (PV) system. The DAQ system is nicknamed as the Girasol Machine (Girasol means Sunflower in Spanish). The sky imaging system consists of a longwave infrared (IR) camera and a visible (VI) light camera with a fisheye lens attached to it. The cameras are installed inside a weatherproof enclosure that it is mounted on an outdoor tracker. The tracker updates its pan an tilt every second using a solar position algorithm to maintain the Sun in the center of the IR and VI images. A pyranometer is situated on a horizontal support next to the DAQ system to measure GSI. The dataset, composed of IR images, VI images, GSI measurements, and the Sun's positions, has been tagged with timestamps.
We built a system composed of VI and IR solar radiation cameras, a tracking system, anda pyranometer, to collect the data. A weatherproof enclosure contains the two USB cameras,and it is mounted on top of two servomotors. The cameras are connected to a motherboard thatruns a solar tracking algorithm. This motherboard is placed inside of a different weatherproofenclosure together with a router, a servomotor control unit, a data storage system, plus theirrespective power supplies. The enclosure’s degree of protection is IP66. This is an internationalstandard utilized for electronic equipment that provides protection against dust and water.
The tracking system and DAQ software is currently operative. The software was programmed in Python 2. The system is placed on the top roof area of the Mechanical Engineer-ing building at UNM central campus (35.0821,−106.6259). The DAQ sessions can be visuallymonitored through a webpage. All devices were interconnected via a LAN network built by DHCP server.
The repository has available recordings of the solar cycle from 244 days of 3 years. The total amount of data is 110Gb. The sampling interval of the cameras is 15 seconds and the observation period is when the Sun's elevation angles is higher than 15°. There are approximately 1,200 to 2,400 captures per day from each camera depending on the day of the year.
- VI images are 16 bits with resolution 450 x 450, intensity channel only. Approx. 240KB per frame. Between 200 MB to 400 MB per day depending on the amount of images in the directory. Images are saved in .png compress-less format in the directory */visible. The image are named by the UNIX time in seconds.
- IR images are 16 bits with resolution 60 x 80. Approx. 8KB per frame. 20MB per day roughly constant. Images are saved in .png compress-less format in the directory */infrared. The image are named by the UNIX time in seconds.
- The pyranometer is sampled from 4 to 6 times per seconds. The measures are saved in the directory */pyranometer in .csv files named with their date (yyyy_mm_dd), approx. 4,500KB to 7,500KB per file. The files contain unix time in the first column and GSI in W/m2 in the second column.
- The Sun position files are generated out of the time recorded in the pyranometer files. The positions are saved in the directory */sun_position in .csv files named with their date (yyyy_mm_dd), approx. 6,500KB to 11,500KB per file. The files contain the unix time in the first column, elevation angle in the second column, and azimuth angle in the third column, all of them computed with full precision unix time.
- The weather station sample interval is 10 minutes. Linear interpolation was applied to match the sampling interval of the pyranomter. The weather station files are saved in the directory */weather_station in .csv files named with their date (yyyy_mm_dd), approx 14.3MB top 25.4MB per file. The files are organized by columns which contain from left to right: unix time, temperature in °C, dew point in °C, atmospheric pressure in mmHg, wind direction in radians, wind velocity in mile/s and relative humidity in %.