December 1998 Validation Experiment

On December 12th 1998 the second MASTER validation was conducted at Lake Meade, NV and Ivanpah Playa, CA by teams from the Jet Propulsion Laboratory (JPL) and the University of Arizona (UofA) respectively. The experiment involved overflights of the MASTER instrument at each of the 2 sites at 3 elevations of 2000m (6560 ft), 4000m (13120 ft) and 6000m (19680 ft). The MASTER instrument was flown on the Department of Energy (DOE) KingAir Beachcraft Aircraft with custom air-fence. The radiance at the sensor was predicted by propagating ground measurements through the atmosphere and the predicted radiance compared to the MASTER measured radiance. The results for each of the MASTER channels at the 3 flight altitudes are summarized below.

Channel Number Center

Wave-

length

Radiances (W/m2 um sr)

Low Altitude

Medium Altitude

High Altitude

Predict MASTER %

Difference

Predict MASTER % Difference Predict MASTER %

Difference

1

0.457

58.288

58.400

-0.192

58.597

57.100

2.554

60.256

57.200

5.072

2

0.498

66.493

68.500

-3.018

64.766

64.900

-0.207

64.984

63.700

1.976

3

0.540

79.552

81.300

-2.197

75.832

75.500

0.437

74.765

72.500

3.030

4

0.581

90.558

91.500

-1.040

85.136

83.800

1.569

83.082

79.700

4.071

5

0.660

90.166

92.000

-2.034

84.044

84.100

-0.067

81.487

79.200

2.807

6

0.711

82.338

83.800

-1.775

75.329

76.300

-1.290

72.522

71.500

1.409

7

0.750

76.452

79.000

-3.333

69.786

71.900

-3.030

67.017

67.200

-0.273

8

0.800

73.746

77.600

-5.225

68.028

70.700

-3.929

65.678

66.000

-0.490

9

0.866

64.052

70.300

-9.755

59.695

64.500

-8.049

57.838

60.100

-3.911

10

0.906

48.586

53.000

-9.084

43.273

48.000

-10.923

41.310

44.400

-7.481

11

0.945

28.558

34.030

-19.159

23.492

30.270

-28.853

21.885

27.470

-25.523

12

1.609

19.857

21.060

-6.061

18.348

19.390

-5.681

17.633

18.150

-2.933

13

1.665

18.139

19.450

-7.226

16.808

17.920

-6.615

16.194

16.850

-4.049

14

1.720

15.135

16.390

-8.290

13.855

15.060

-8.699

13.321

14.240

-6.899

15

1.775

8.361

9.440

-12.911

7.190

8.580

-19.332

6.795

8.090

-19.058

16

1.828

0.496

1.500

-202.358

0.350

1.400

-300.114

0.313

1.200

-283.264

17

1.875

0.035

0.730

-1973.864

0.030

0.690

-2238.983

0.028

0.570

-1943.011

18

1.924

0.299

1.100

-267.401

0.180

0.970

-440.390

0.147

0.790

-436.320

19

1.981

3.545

3.800

-7.196

2.687

3.320

-23.581

2.390

3.020

-26.365

20

2.081

6.923

7.140

-3.134

5.975

6.410

-7.288

5.541

5.950

-7.391

21

2.160

6.673

7.210

-8.055

6.143

6.600

-7.436

5.913

6.250

-5.698

22

2.211

5.686

6.340

-11.506

5.213

5.780

-10.875

4.999

5.430

-8.626

23

2.258

5.277

5.600

-6.127

4.798

5.090

-6.088

4.554

4.780

-4.958

24

2.328

4.021

3.990

0.781

3.535

3.580

-1.267

3.296

3.360

-1.936

25

2.394

2.455

2.520

-2.643

2.045

2.250

-10.041

1.885

2.100

-11.418

26-40*

41

7.760

6.193

6.182

0.187

5.583

5.547

-1.040

5.101

4.881

4.325

42

8.168

7.163

7.155

0.117

6.967

6.899

-0.050

6.844

6.763

1.186

43

8.632

7.681

7.701

-0.258

7.613

7.563

-0.226

7.588

7.559

0.379

44

9.094

7.975

7.990

-0.181

7.930

7.900

-0.251

7.916

7.874

0.520

45

9.700

8.175

8.211

-0.441

8.102

8.039

0.027

8.023

8.002

0.262

46

10.116

8.223

8.253

-0.362

8.199

8.165

-0.017

8.189

8.151

0.462

47

10.633

8.156

8.196

-0.483

8.133

8.107

-0.574

8.130

8.092

0.470

48

11.329

7.931

7.952

-0.255

7.911

7.879

-0.108

7.915

7.880

0.447

49

12.117

7.525

7.541

-0.217

7.493

7.458

-1.422

7.490

7.440

0.670

50

12.878

7.040

7.011

0.408

6.956

6.854

-1.784

6.910

6.871

0.556

* No results were obtained for the mid infrared channels (Port 3) due to noise problems with the MASTER data. A linear variable filter is being added to Port 3 which should reduce this problem.