4.7. NUCAPS Reader

The NUCAPS Reader supports reading NUCAPS Retrieval files. This reader can be used by specifying the name nucaps to the polar2grid.sh script. Files for this reader should follow the naming scheme:

NUCAPS-EDR_v1r0_npp_s201603011158009_e201603011158307_c201603011222270.nc

This reader’s default resampling algorithm is ewa for Elliptical Weighted Averaging resampling. The --fornav-D parameter is set to 40 and the --fornav-d parameter is set to 1.

This reader can provide the following products:

Product Name

Description

Temperature_Xmb

Temperature at various pressure levels

H2O_MR_Xmb

Water Vapor Mixing Ratio at various pressure levels

Topography

Height at surface

Surface_Pressure

Pressure at surface

Skin_Temperature

Skin Temperature

Pressure based datasets are specified by the pressure level desired in millibars. The value used in the product name is listed in the table below for each corresponding pressure value:

Pressure Value

Name Value

0.016

0.016

0.038

0.038

0.077

0.077

0.137

0.137

0.224

0.224

0.345

0.345

0.506

0.506

0.714

0.714

0.975

0.975

1.297

1.297

1.687

1.687

2.153

2.153

2.701

2.701

3.340

3.340

4.077

4.077

4.920

4.920

5.878

6

6.957

7

8.165

8

9.512

10

11.004

11

12.649

13

14.456

14

16.432

16

18.585

19

20.922

21

23.453

23

26.183

26

29.121

29

32.274

32

35.651

36

39.257

39

43.100

43

47.188

47

51.528

52

56.126

56

60.989

61

66.125

66

71.540

72

77.240

77

83.231

83

89.520

90

96.114

96

103.017

103

110.237

110

117.777

118

125.646

126

133.846

134

142.385

142

151.266

151

160.496

160

170.078

170

180.018

180

190.320

190

200.989

201

212.028

212

223.441

223

235.234

235

247.408

247

259.969

260

272.919

273

286.262

286

300.000

300

314.137

314

328.675

329

343.618

344

358.966

359

374.724

375

390.893

391

407.474

407

424.470

424

441.882

442

459.712

460

477.961

478

496.630

497

515.720

516

535.232

535

555.167

555

575.525

576

596.306

596

617.511

618

639.140

639

661.192

661

683.667

684

706.565

707

729.886

730

753.628

754

777.790

778

802.371

802

827.371

827

852.788

853

878.620

879

904.866

905

931.524

932

958.591

959

986.067

986

1013.950

1014

1042.230

1042

1070.920

1071

1100.000

1100

4.7.1. Command Line Arguments

usage: polar2grid.sh nucaps <writer> [-h] [--list-products]
                                     [--no-mask-surface] [--no-mask-quality]
                                     [-p PRODUCTS [PRODUCTS ...]]
                                     [--pressure-levels PRESSURE_LEVELS PRESSURE_LEVELS]

4.7.1.1. Frontend Initialization

swath extraction initialization options

--list-products

List available frontend products and exit

Default: False

--no-mask-surface

Don’t mask pressure based datasets that go below the surface pressure

Default: True

--no-mask-quality

Don’t mask datasets based on Quality Flag

Default: True

4.7.1.2. Frontend Swath Extraction

swath extraction options

-p, --products

Specify frontend products to process

--pressure-levels

Min and max pressure value to make available

Default: (110.0, 987.0)