4.8. MIRS Reader

The MIRS frontend extracts data from files created by the Community Satellite Processing Package (CSPP) direct broadcast version of the NOAA/STAR Microwave Integrated Retrieval System (MIRS). The software supports the creation of atmospheric profile and surface parameters from ATMS, AMSU-A, and MHS microwave sensor data. For more information on this product, please see the CSPP LEO distribution website.

When executed on Suomi-NPP Advanced Technology Microwave Sounder (ATMS) MIRS product files, a limb correction algorithm is applied for brightness temperatures reprojections for each of the 22 spectral bands. The correction software was provided by Kexin Zhang of NOAA STAR, and is applied as part of the MIRS ATMS Polar2Grid execution.

This reader’s default resampling algorithm is ewa for Elliptical Weighted Averaging resampling. The --fornav-D option is set to 100 and the --fornav-d option is set to 1.

The frontend offers the following products:

Product Name

Description

rain_rate

Rain Rate

sea_ice

Sea Ice in percent

snow_cover

Snow Cover

tpw

Total Precipitable Water

swe

Snow Water Equivalence

btemp_X

Brightness Temperature for channel X (see below)

For specific brightness temperature band products, use the btemp_X option, where X is a combination of the microwave frequency (integer) and polarization of the channel. If there is more than one channel at that frequency and polarization a “count” number is added to the end. To create output files of all available bands, use the --bt-channels option.

As an example, the ATMS band options are:

Table 4.1 ATMS Brightness Temperature Channels

Band Number

Frequency (GHz)

Polarization

Polar2Grid Dataset Name

1

23.79

V

btemp_23v

2

31.40

V

btemp_31v

3

50.30

H

btemp_50h

4

51.76

H

btemp_51h

5

52.80

H

btemp_52h

6

53.59±0.115

H

btemp_53h

7

54.40

H

btemp_54h1

8

54.94

H

btemp_54h2

9

55.50

H

btemp_55h

10

57.29

H

btemp_57h1

11

57.29±2.17

H

btemp_57h2

12

57.29±0.3222±0.048

H

btemp_57h3

13

57.29±0.3222±0.022

H

btemp_57h4

14

57.29±0.3222±0.010

H

btemp_57h5

15

57.29±0.3222±0.0045

H

btemp_57h6

16

88.20

V

btemp_88v

17

165.50

H

btemp_165h

18

183.31±7.0

H

btemp_183h1

19

183.31±4.5

H

btemp_183h2

20

183.31±3.0

H

btemp_183h3

21

183.31±1.8

H

btemp_183h4

22

183.31±1.0

H

btemp_183h5

4.8.1. Command Line Arguments

usage: polar2grid.sh mirs <writer> [-h] [--list-products] [--bt-channels]
                                   [-p [PRODUCTS [PRODUCTS ...]]]

4.8.1.1. Frontend Initialization

swath extraction initialization options

--list-products

List available frontend products

Default: False

4.8.1.2. Frontend Swath Extraction

swath extraction options

--bt-channels

Add all BT channels to the list of requested products

Default: False

-p, --products

Specify frontend products to process

4.8.2. Execution Examples

polar2grid.sh mirs gtiff --list-products -f /atms/NPR-MIRS-IMG_v11r1_NPP_s201611111032500_e201611111044016_c201611111121100.nc

polar2grid.sh mirs gtiff -p btemp_23v btemp_183h3 swe -g lcc_fit -f /atms/

polar2grid.sh mirs scmi -p swe tpw sea_ice rain_rate btemp_89v1 --grid-coverage=0 -g merc_pacific_1km --sector-id Pacific --letters --compress  -f /noaa18/IMG_SX.NN.D17037.S1358.E1409.B6037373.WE.HR.ORB.nc

polar2grid.sh mirs scmi --bt-channels -g lcc_conus_750 --sector-id LCC --letters --compress -f ../input/NPR-MIRS-IMG_v11r1_NPP_s201611111032500_e201611111044016_c201611111121100.nc

polar2grid.sh mirs hdf5 --add-geolocation -f ../metop/IMG_SX.M1.D17037.S1648.E1700.B0000001.WE.HR.ORB.nc