Quality assessment of CAMS radiation service values against 31 INMET stations

Last update: Jan. 2016

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Protocol

Date & Authors: Jan. 2016

  • Dr Etienne Wey, Transvalor
  • Pr Lucien Wald, MINES ParisTech
  • Dr Philippe Blanc, MINES ParisTech
  • and Dr Claire Thomas, Transvalor

(A publication is on the way)

The CAMS radiation service values are compared to the hourly Global Horizontal Irradiation measurements from the 31 stations of the INMET network.
The measurements, also named observations, were originally quality checked using the procedure described here. As only the GHI component is available in the observations for both datasets, no consistency check is possible via cross-comparison from one component to another. Unfortunately, this protocol turned out to be insufficient for these hourly measurements and that the test to discard the not plausible values ("Extremely Rare Limits" and "Physical Possible Limits") were too permissive; Too many outlyers remained after the QC. Prior the computation of the different quantities to assess the deviation between the satellite estimates and the station measurements as depicted in the protocol of validation, we decided to discard also the measurement values when they are:

  • below 5% * clear sky dry, which corresponds to the ESRA clear sky with no turbidity
  • above 100% * clear sky dry

We remind that the other steps are:

  • Set night, sunrise and sunset observation values to zero
  • Set observation values below 10 W/m² to zero
  • As soon as the quality check procedure is over, then aggregate the hourly values to generate partial daily and monthly sums as depicted in the protocol of validation.

Illustration: list of the INMET and INPE stations used for the validation


 

List of the 31 stations

Station State Latitude (°) Longitude (°) Altitude (m) Period of data availability
Agua-Clara MS -20.444 -52.876 338 2010-08-16 to 2014-12-31
Aquidauana MS -20.475 -55.784 155 2006-11-01 to 2014-12-31
Ararangua SC -28.931 -49.498 12 2008-09-29 to 2014-12-31
Bataguassu MS -21.750 -52.471 387 2013-04-09 to 2014-12-31
Cacoal RO -11.446 -61.434 210 2008-07-20 to 2014-12-31
Campo-Bom RS -29.674 -51.064 24 2013-12-02 to 2014-12-31
Canela RS -29.369 -50.827 830 2008-08-27 to 2014-12-31
Cidade-Gaucha PR -23.359 -52.932 381 2008-03-11 to 2014-12-31
Clevelandia PR -26.417 -52.349 980 2008-05-16 to 2014-12-31
Corumba MS -18.997 -57.638 126 2006-10-26 to 2014-12-31
Costa-Rica MS -18.493 -53.171 730 2012-12-06 to 2014-12-31
Curitibanos SC -27.289 -50.604 982 2008-02-29 to 2014-12-31
Dionisio-Cerqueira SC -26.287 -53.633 810 2008-05-31 to 2014-12-31
Dom-Pedrito RS -30.992 -54.815 170 2010-04-27 to 2014-12-31
Dourados MS -22.194 -54.911 469 2006-10-21 to 2014-12-31
Fos-do-Iguacu PR -25.602 -54.483 321 2008-02-15 to 2014-12-31
Ibiruba RS -28.653 -53.112 456 2012-12-12 to 2014-12-31
Jardim MS -21.479 -56.138 249 2011-08-09 to 2014-12-31
Joacaba SC -27.169 -51.559 776 2007-10-16 to 2014-12-31
Joaquim-Tavora PR -23.505 -49.946 522 2006-11-24 to 2014-12-31
Major-Vieira SC -26.394 -50.363 808 2009-02-10 to 2014-12-31
Maringa PR -23.405 -51.933 542 2006-11-21 to 2014-12-31
Nova-Tebas PR -24.437 -51.963 654 2006-12-21 to 2014-12-31
Porto-Velho RO -8.794 -63.846 95 2007-07-12 to 2014-12-31
Santiago RS -29.192 -54.886 394 2009-02-04 to 2014-12-31
Sonora MS -17.635 -54.760 495 2012-12-03 to 2014-12-31
Teutonia RS -29.450 -51.824 81 2012-08-08 to 2014-12-31
Uruguaiana RS -29.840 -57.082 62 2006-09-28 to 2014-12-31
Ventania PR -24.280 -50.210 1106 2011-04-18 to 2014-12-31
Vilhena RO -12.735 -60.158 590 2008-08-26 to 2014-12-31
Xanxere SC -26.939 -52.398 889 2008-03-16 to 2014-12-31

 

CAMS radiation service -- GHI Quality assessment results vs. the INMET stations in Brazil
MONTHLY SUM OF HOURLY IRRADIATION
Station Number of values Mean
- INMET station -
(kWh/m²)
Bias
(kWh/m2)
(relative in %
)
RMSE
(kWh/m2)
(relative in %
)
Correl. coeff.
Agua-Clara 35 152.8 12.6 (8.3%) 13.5 (8.8%) 0.986
Aquidauana 88 148.6 8.5 (5.7%) 9.9 (6.7%) 0.986
Ararangua 63 123.6 9.2 (7.5%) 11.4 (9.2%) 0.993
Bataguassu 14 153.5 7.9 (5.2%) 8.7 (5.7%) 0.996
Cacoal 70 130.5 15.9 (12.2%) 17.8 (13.6%) 0.921
Campo-Bom 6 149.5 14.7 (9.8%) 15.2 (10.1%) 0.999
Canela 69 130.2 8.9 (6.8%) 11.3 (8.7%) 0.995
Cidade-Gaucha 66 146.3 9.9 (6.8%) 11.2 (7.6%) 0.993
Clevelandia 73 138.2 11.1 (8.0%) 13.5 (9.8%) 0.992
Corumba 85 148.5 5.9 (4.0%) 8.4 (5.7%) 0.972
Costa-Rica 18 147.9 15.5 (10.5%) 16.6 (11.2%) 0.918
Curitibanos 76 131.4 5.1 (3.9%) 6.8 (5.2%) 0.996
Dionisio-Cerqueira 60 143.5 9.3 (6.5%) 11.7 (8.2%) 0.994
Dom-Pedrito 50 142.2 1.8 (1.3%) 4.0 (2.8%) 0.999
Dourados 86 148.8 9.1 (6.1%) 11.2 (7.5%) 0.987
Fos-do-Iguacu 69 139.3 2.0 (1.5%) 5.5 (3.9%) 0.994
Ibiruba 10 140.7 9.7 (6.9%) 10.8 (7.7%) 0.997
Jardim 33 153.3 10.0 (6.5%) 11.3 (7.4%) 0.991
Joacaba 79 139.2 10.3 (7.4%) 12.3 (8.8%) 0.995
Joaquim-Tavora 91 147.4 11.3 (7.7%) 12.1 (8.2%) 0.995
Major-Vieira 61 116.4 9.6 (8.3%) 11.3 (9.7%) 0.994
Maringa 67 152.9 3.1 (2.0%) 7.9 (5.2%) 0.980
Nova-Tebas 85 147.1 4.7 (3.2%) 9.2 (6.2%) 0.981
Porto-Velho 72 122.7 9.4 (7.7%) 14.2 (11.6%) 0.861
Santiago 61 144.1 2.5 (1.8%) 5.4 (3.7%) 0.996
Sonora 18 141.5 12.7 (9.0%) 14.1 (10.0%) 0.944
Teutonia 5 139.5 14.3 (10.3%) 14.9 (10.7%) 1.000
Uruguaiana 86 148.4 -1.3 (-0.9%) 3.3 (2.3%) 0.998
Ventania 23 148.6 16.9 (11.4%) 18.7 (12.6%) 0.984
Vilhena 69 127.7 16.4 (12.9%) 17.8 (13.9%) 0.955
Xanxere 68 142.1 6.7 (4.7%) 9.3 (6.6%) 0.993

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CAMS radiation service -- GHI Quality assessment results vs. the INMET stations in Brazil
DAILY SUM OF HOURLY IRRADIATION
Station Number of values Mean
- INMET station -
(Wh/m²)
Bias
(Wh/m2)
(relative in %
)
RMSE
(Wh/m2)
(relative in %
)
Correl. coeff.
Agua-Clara 1035 5345.0 423.2 (7.9%) 656.9 (12.3%) 0.951
Aquidauana 2476 5304.3 303.1 (5.7%) 607.3 (11.4%) 0.948
Ararangua 1752 4449.6 332.4 (7.5%) 652.4 (14.7%) 0.966
Bataguassu 393 5453.6 281.9 (5.2%) 487.3 (8.9%) 0.973
Cacoal 1888 4807.7 588.9 (12.2%) 894.8 (18.6%) 0.804
Campo-Bom 164 5460.3 534.5 (9.8%) 694.9 (12.7%) 0.982
Canela 1828 4950.4 335.5 (6.8%) 694.2 (14.0%) 0.960
Cidade-Gaucha 1902 5127.5 348.9 (6.8%) 574.0 (11.2%) 0.972
Clevelandia 1991 5056.9 405.9 (8.0%) 707.5 (14.0%) 0.959
Corumba 2356 5350.4 214.6 (4.0%) 649.9 (12.1%) 0.913
Costa-Rica 500 5305.8 555.4 (10.5%) 799.0 (15.1%) 0.898
Curitibanos 2118 4714.4 182.5 (3.9%) 615.6 (13.1%) 0.953
Dionisio-Cerqueira 1740 5110.2 329.9 (6.5%) 603.9 (11.8%) 0.971
Dom-Pedrito 1373 5146.0 68.7 (1.3%) 383.2 (7.4%) 0.987
Dourados 2473 5202.8 322.8 (6.2%) 622.2 (12.0%) 0.958
Fos-do-Iguacu 1945 5038.6 73.6 (1.5%) 568.3 (11.3%) 0.965
Ibiruba 307 5770.6 381.0 (6.6%) 784.7 (13.6%) 0.953
Jardim 938 5430.4 351.4 (6.5%) 612.2 (11.3%) 0.959
Joacaba 2253 4877.0 359.6 (7.4%) 674.7 (13.8%) 0.965
Joaquim-Tavora 2658 5040.5 385.6 (7.7%) 632.0 (12.5%) 0.962
Major-Vieira 1606 4448.6 367.9 (8.3%) 611.3 (13.7%) 0.965
Maringa 1943 5267.6 105.5 (2.0%) 580.4 (11.0%) 0.952
Nova-Tebas 2420 5238.9 164.8 (3.1%) 588.7 (11.2%) 0.956
Porto-Velho 1896 4642.4 358.0 (7.7%) 861.5 (18.6%) 0.746
Santiago 1730 5128.8 91.2 (1.8%) 465.0 (9.1%) 0.980
Sonora 475 5355.4 479.2 (8.9%) 791.0 (14.8%) 0.882
Teutonia 272 4958.8 625.1 (12.6%) 958.7 (19.3%) 0.942
Uruguaiana 2430 5277.0 -46.8 (-0.9%) 483.5 (9.2%) 0.979
Ventania 661 5180.7 589.9 (11.4%) 772.5 (14.9%) 0.961
Vilhena 1852 4754.5 612.6 (12.9%) 906.8 (19.1%) 0.820
Xanxere 1926 5069.8 243.3 (4.8%) 649.0 (12.8%) 0.959

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CAMS radiation service -- GHI Quality assessment results vs. the INMET stations in Brazil
HOURLY SUM OF HOURLY IRRADIATION
Station Number of values Mean
- INMET station -
(Wh/m²)
Bias
(Wh/m2)
(relative in %
)
RMSE
(Wh/m2)
(relative in %
)
Correl. coeff.
Agua-Clara 12305 463.9 37.0 (8.0%) 109.6 (23.6%) 0.945
Aquidauana 28434 463.5 26.4 (5.7%) 96.9 (20.9%) 0.952
Ararangua 20607 381.7 29.0 (7.6%) 98.9 (25.9%) 0.949
Bataguassu 4562 471.2 24.4 (5.2%) 82.4 (17.5%) 0.967
Cacoal 22106 415.8 50.7 (12.2%) 141.3 (34.0%) 0.892
Campo-Bom 2037 440.5 43.2 (9.8%) 100.4 (22.8%) 0.962
Canela 21314 425.1 28.8 (6.8%) 107.6 (25.3%) 0.942
Cidade-Gaucha 21972 444.3 30.3 (6.8%) 90.1 (20.3%) 0.961
Clevelandia 23248 434.1 34.9 (8.0%) 105.7 (24.3%) 0.946
Corumba 27045 473.9 19.1 (4.0%) 106.0 (22.4%) 0.939
Costa-Rica 5712 466.1 48.7 (10.5%) 126.0 (27.0%) 0.926
Curitibanos 24616 405.7 15.7 (3.9%) 106.1 (26.1%) 0.935
Dionisio-Cerqueira 20124 442.6 28.6 (6.5%) 102.3 (23.1%) 0.948
Dom-Pedrito 15765 451.0 5.8 (1.3%) 70.2 (15.6%) 0.975
Dourados 28524 452.6 27.7 (6.1%) 104.5 (23.1%) 0.945
Fos-do-Iguacu 22009 452.4 6.6 (1.5%) 94.0 (20.8%) 0.954
Ibiruba 3653 493.0 32.6 (6.6%) 121.5 (24.6%) 0.934
Jardim 10837 470.2 30.5 (6.5%) 98.2 (20.9%) 0.954
Joacaba 26362 417.3 30.8 (7.4%) 100.6 (24.1%) 0.951
Joaquim-Tavora 31140 430.7 33.0 (7.7%) 96.5 (22.4%) 0.957
Major-Vieira 18658 383.5 31.7 (8.3%) 97.5 (25.4%) 0.951
Maringa 22577 453.7 9.1 (2.0%) 106.5 (23.5%) 0.938
Nova-Tebas 27930 454.6 14.4 (3.2%) 102.2 (22.5%) 0.945
Porto-Velho 21725 415.4 30.9 (7.5%) 147.5 (35.5%) 0.860
Santiago 19827 449.4 7.9 (1.8%) 82.5 (18.3%) 0.965
Sonora 5430 469.2 42.2 (9.0%) 129.5 (27.6%) 0.916
Teutonia 3177 433.7 54.1 (12.5%) 144.5 (33.3%) 0.904
Uruguaiana 27839 462.5 -4.0 (-0.9%) 81.0 (17.5%) 0.967
Ventania 7803 438.9 50.0 (11.4%) 109.8 (25.0%) 0.950
Vilhena 21838 404.8 52.1 (12.9%) 143.6 (35.5%) 0.890
Xanxere 22384 438.0 21.5 (4.9%) 106.3 (24.3%) 0.941