August 18 2001 ER2 Validation Experiment

On August 18 2001 a MASTER validation experiment was conducted at Lake Tahoe, CA/NV by the MASTER team. The experiment involved overflights of the MASTER instrument at 3 altitudes. The 3 overflight altitudes, above mean sea level, were 21780 m 15470 m and 12470 m respectively. The MASTER instrument was flown on the NASA ER-2 Aircraft with an 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 thermal channels at the 3 flight altitudes are summarized below.

 

Channel Number

Center
Wavelength

Radiances (W/m2 um sr)

Low Altitude

Medium Altitude

High Altitude

Predict

MASTER

%

Difference

Predict

MASTER

% Difference

Predict

MASTER

%

Difference

41

7.875

5.250

5.154

1.826

5.052

4.880

3.410

4.908

4.772

2.778

42

8.308

7.608

7.814

-2.718

7.569

7.727

-2.082

7.480

7.599

-1.586

43

8.740

8.176

8.356

-2.199

8.132

8.288

-1.915

8.003

8.177

-2.168

44

9.208

8.338

8.476

-1.655

8.173

8.418

-2.996

7.854

8.191

-4.290

45

9.850

8.117

8.441

-3.994

7.529

8.227

-9.271

6.483

7.473

-15.280

46

10.287

8.659

8.690

-0.357

8.629

8.658

-0.333

8.522

8.532

-0.119

46

10.833

8.552

8.615

-0.729

8.536

8.575

-0.452

8.465

8.455

0.121

48

11.543

8.235

8.303

-0.826

8.222

8.273

-0.615

8.156

8.217

-0.757

49

12.360

7.641

7.677

-0.465

7.627

7.647

-0.264

7.574

7.597

-0.302

50

13.092

6.790

6.910

-1.772

6.744

6.768

-0.363

6.667

6.742

-1.129

 

 

 

 

 

 

 

 

 

 

 

% Difference = (P-M/P)*100

 

Channel Number

Center
Wavelength

Brightness Temperatures

Low Altitude

Medium Altitude

High Altitude

Predict

MASTER

BT

Difference

Predict

MASTER

BT Difference

Predict

MASTER

BT

Difference

41

7.875

275.984

275.218

0.766

274.388

272.964

1.424

273.208

272.062

1.146

42

8.308

289.466

290.765

-1.299

289.221

290.217

-0.996

288.654

289.411

-0.757

43

8.740

290.942

292.061

-1.119

290.670

291.643

-0.973

289.853

290.948

-1.095

44

9.208

290.496

291.381

-0.885

289.426

291.010

-1.583

287.318

289.545

-2.226

45

9.850

288.080

290.308

-2.228

283.901

288.847

-4.947

275.919

283.492

-7.573

46

10.287

291.946

292.162

-0.216

291.739

291.940

-0.201

290.984

291.054

-0.071

46

10.833

292.100

292.563

-0.463

291.980

292.267

-0.286

291.452

291.375

0.078

48

11.543

291.866

292.421

-0.555

291.757

292.170

-0.413

291.212

291.719

-0.507

49

12.360

290.445

290.775

-0.330

290.312

290.499

-0.187

289.819

290.033

-0.213

50

13.092

286.071

287.357

-1.286

285.573

285.836

-0.263

284.740

285.552

-0.813

 

 

 

 

 

 

 

 

 

 

 

BT Difference = (P-M)