CIMSS
SSEC / UW-Madison

PATMOS-x AVHRR Pathfinder Atmospheres - Extended

PATMOS-x Data File Contents

Here is a rudimentary listing of the contents of the gridded HDF files. This information can be retrieved for each file using the hdp command as follows
hdp -h dumpsds the_patmosx_file.hdf

List of Attributes within each PATMOS-x file

PROCESSOR

Version of CLAVR-x used for this processing

CREATED

Date of creation of this file

HDF_VER

HDF version used for making this file

FILENAME

the name of the file

L1B

the name of the 1b data (orbital)

START_YEAR

year of start of data

START_DAY

julian dat for start of data

START_TIME

time in hours of start of data

END_YEAR

end of end of data

END_DAY

julian day for end of data

END_TIME

time in hours of end of data

MACHINE

machine used to process data

PROGLANG

language used to make executables

DATA_TYPE

type of data (gridcell or pixel)

NUM_CELLS_MAX

maximum nimber of cells to cover the globe

NUM_CELLS

number of cells in this file

GRIDCELL_RESOLUTION

angular resolution of the grid.

GRIDCELL_RESOLUTION_UNIT

unit of resolution (degree)

GRIDCELL_FORMAT

either equal area or equal angle

MISSING_VALUE_REAL4

missing value assumed for 4 byte real numbers

MISSING_VALUE_INT4

missing value for 4 byte integers

MISSING_VALUE_INT2

missing value for 2 byte integers

MISSING_VALUE_INT1

missing value for 1 byte integers

The following attributes allow conversion of radiance to temperature using the methods and notation in NOAA POD/KLM Users Guides

C1

first Planck Constant

C2

second Planck Constant

A_3b

Channel 3b effective temperature term 1

B_3b

Channel 3b effective temperature term 2

NU_3b

central wavenumber of channel 3b

B_4

Channel 4 effective temperature term 1

B_4

Channel 4 effective temperature term 2

NU_4

central wavenumber for channel 4

A_5

Channel 5 effective temperature term 1

B_5

Channel 5 effective temperature term 2

NU_5

central wavenumber for channel 5

SOLAR_3B_NU

amount of solar energy in channel 3b (mW/cm^2/cm^1)

SUN_EARTH_DISTANCE

sunearthdistance (AU)

The Following Attributes Tell of the User Defined Options Excercised for the this data

USE_1B_THERMAL_CALIBRATION_FLAG

T if thermal calibration in Level 1b used, otherwise F

USE_1B_REFLECTANCE_CALIBRATION_FLAG

T if reflectance calibration in Level 1b used, otherwise F

RENAVIGATION_FLAG

T if external navigation file used for geolocation, otherwise F

USE_SST_ANALYSIS_FLAG

T if an SST analysis field was used

SST_ANALYSIS_SOURCE_FLAG

if above USE_SST_ANALYSIS_FLAG is TRUE then 0 means the weekly OISST files used
1 means a specifici OISST file used
2 means the NESDIS Global weekly 100 km analysis used

NWP_FLAG

0 means no NWP data,
1 means GFS 12 hr forecasts,
2 means 6-hourly NCEP Reanalysis

CLEAR_SKY_COMPOSITE_FLAG

0 - means no clear sky composites were used
1 - means version 1 clear sky composites

The Following Attributes Relate to the Reflectance Calibration

CH1_GAIN_LOW

channel 1 gain for low count range

CH1_GAIN_HIGH

channel 1 gain for high count range

CH1_SWITCH_COUNT

count at which the gain switches from low to high for channel 1

CH1_DARK_COUNT

the predefined dark count for channel 1

CH2_GAIN_LOW

channel 2 gain for low count range

CH2_GAIN_HIGH

channel 2 gain for high count range

CH2_SWITCH_COUNT

count at which the gain switches from low to high for channel 1

CH2_DARK_COUNT

the predefined dark count for channel 1

CH3A_GAIN_LOW

channel 3a gain for low count range

CH3A_GAIN_HIGH

channel 3a gain for high count range

CH3A_SWITCH_COUNT

count at which the gain switches from low to high for channel 1

CH3A_DARK_COUNT

the predefined dark count for channel 1

List of Parameters (number denotes index in HDF file)

1

cell_index - index of cell (1 - NUM_CELLS_MAX)

2

cell_longitude - longitude of cell center

3

cell_latitude - latitude of cell center

4

spacecraft_id - id of this craft (14 - NOAA-14)

5

asc_des_flag - ascending/descending flag (0 = ascending)

6

ch3a_on_flag - flag of whether ch3a or ch3bis on (1 = ch3a on)

7

orbit_number - number of this orbit

8

time - time in hours

9

jday - julian day

10

year - 4 digit year

11

surface_type - dominant UMD surface type (14 = perrenial snow/ice)

12

sensor_zenith - sensor zenith angle (degrees)

13

solar_zenith - solar zenith angle (degrees)

14

relative_azimuth - relative azimuth angle (degrees)

15

glint_zenith - glint zenith angle (0 = center of specular reflection)

16

surface_elevation - surface elevation (m)

125

ch1_count - mean ch1 count

126

ch2_count - mean ch2 count

21

clr_pixel_count - number of clear pixels

22

prob_clr_pixel_count - number of probably clear pixels

23

prob_cldy_pixel_count - number of probably cloudy pixels

24

cldy_pixel_count - number of cloudy pixels

25

prob_clr_water_pixel_count - number of probably clear pixels that of water phase

26

prob_cldy_water_pixel_count - number of probably cloudy pixels that of water phase

27

terminator_pixel_frac - number of pixels in the terminator

Radiance Products

The following products are the means and standard deviations of each channel for each cloud mask value including all-sky clr - denotes clear, prob_clr denotes probably clear, prob_cldy denotes probably cloudy, cldy denotes cloudy ch1, ch2 and ch3ab_ref are reflectances (0-100%). Ch3b, ch4, and ch5 are in radiances. Those with std in their names are standard deviations, otherwise they are mean values.

31

ch1_clr

32

ch2_clr

33

ch3ab_ref_clr

34

ch3b_clr

35

ch4_clr

36

ch5_clr

37

ch1_prob_clr

38

ch2_prob_clr

39

ch3ab_ref_prob_clr

40

ch3b_prob_clr

41

ch4_prob_clr

42

ch5_prob_clr

43

ch1_prob_cldy

44

ch2_prob_cldy

45

ch3ab_ref_prob_cldy

46

ch3b_prob_cldy

47

ch4_prob_cldy

48

ch5_prob_cldy

49

ch1_cldy

50

ch2_cldy

51

ch3ab_ref_cldy

52

ch3b_cldy

53

ch4_cldy

54

ch5_cldy

55

ch1

56

ch2

57

ch3ab_ref

58

ch3b

59

ch4

60

ch5

61

ch1_std_clr

62

ch2_std_clr

63

ch3ab_ref_std_clr

64

ch3b_std_clr

65

ch4_std_clr

66

ch5_std_clr

67

ch1_std_prob_clr

68

ch2_std_prob_clr

69

ch3ab_ref_std_prob_clr

70

ch3b_std_prob_clr

71

ch4_std_prob_clr

72

ch5_std_prob_clr

73

ch1_std_prob_cldy

74

ch2_std_prob_cldy

75

ch3ab_ref_std_prob_cldy

76

ch3b_std_prob_cldy

77

ch4_std_prob_cldy

78

ch5_std_prob_cldy

79

ch1_std_cldy

80

ch2_std_cldy

81

ch3ab_ref_std_cldy

82

ch3b_std_cldy

83

ch4_std_cldy

84

ch5_std_cldy

85

ch1_std

86

ch2_std

87

ch3ab_ref_std

88

ch3b_std

89

ch4_std

90

ch5_std

Cloud Products

20

cld_type - dominant cloud type (0-7)

101

frac_total_cld - Total Cloud Fraction (0-1)

102

frac_water_cld - Fraction of Clouds that are of water phase

103

frac_ice_cld - Fraction of Clouds that are of ice phase

104

frac_low_cld - Fraction of cloud whose cloud-top pressure are greater than 680 mb.

105

frac_mid_cld - Fraction of cloud whose cloud-top pressure are between 440 and 680 mb

106

frac_high_cld - Fraction of cloud whose cloud-top pressure are less than 440 mb.

107

frac_ct1 - fraction of cloud whose cloud type is 1 (fog)

108

frac_ct2- fraction of cloud whose cloud type is 2 (liquid)

109

frac_ct3 - fraction of cloud whose cloud type is 3 (supercooled water)

110

frac_ct4 - fraction of cloud whose cloud type is 4 (opaque ice)

111

frac_ct5 - fraction of cloud whose cloud type is 5 (cirrus - semitransparent ice)

112

frac_ct6- fraction of cloud whose cloud type is 6 (cirrus over low)

113

cld_temp_ir - mean cloud-top temperature derived from IR method (day/night)

114

cld_emiss_ir - mean 11 micron cloud emissivity derived from IR method

115

cld_opd - mean cloud optical depth (day)

116

cld_reff - mean cloud effective particle radius (micron) (day)

117

cld_lwp - mean cloud liquid water path (kg/m^2) (day)

118

cld_iwp - mean cloud ice water path (kg/m^2) (day)

119

cld_temp_ir_std - standard deviation of cloud-top temp_ir

120

cld_emiss_ir_std

121

cld_opd_std

122

cld_reff_std

123

cld_lwp_std

124

cld_iwp_std

140

frac_total_cld_ir - Total cloud amount from only IR tests (day/night)

141

cld_temp_ir_wat - Same as cld_temp_ir except for water clouds only

142

cld_emiss_ir_wat

143

cld_opd_wat

144

cld_reff_wat

145

cld_temp_ir_std_wat

146

cld_emiss_ir_std_wat

147

cld_opd_std_wat

148

cld_reff_std_wat

149

cld_temp_ir_ice

150

cld_emiss_ir_ice

151

cld_opd_ice

152

cld_reff_ice

153

cld_temp_ir_std_ice

154

cld_emiss_ir_std_ice

155

cld_opd_std_ice

156

cld_reff_std_ice

162

cld_press_ir - cloud top pressure (hPa) from IP method (day/night)

163

cld_press_ir_wat

164

cld_press_ir_ice

165

cld_height_ir

166

cld_height_ir_wat

167

cld_height_ir_ice

176

cld_opd_ir - visible optical depth derived from cld_emiss_ir

177

cld_opd_ir_wat

178

cld_opd_ir_ice

196

cld_temp - cloud top temperature not from IR algorithm (currently missing)

197

cld_temp_wat

198

cld_temp_ice

199

cld_temp_std

200

cld_temp_std_wat

201

cld_temp_std_ice

Non-Cloud Atmospheric (Aerosol/Ash/Dust/Smoke) Products

129

aot1 - mean Ch1 aerosol optical thickness

130

aot1_std - standard deviation of ch1 aerosol optical thickness

131

aot2 - mean ch2 aerosol optical thickness

132

aot2_std - standard deviation of ch2 aerosol optical thickness

168

ash_frac - ash fraction

169

ash_ice_frac - fraction of ash mixed in with ice

30

dust_pixel_frac - fraction of clear pixels thought to be dust

195

smoke_frac - fraction of cell populated by smoke

28

snow_pixel_frac - fraction of clear pixels found to be snow covered

Radiative Flux Products

133

olr - mean outgoing longwave radiation (W/m^2)

134

olr_std - standard deviation of olr

135

swar - mean shortwave absorbed solar radiation (W/m^2)

136

swar_std - standard deviation of swat

Precipitation Products

17

gpi_235 - Global Precipitation Index based on 235 K

18

gpi_255 - Global Precipitation Index based on 255 K

19

gpi_275 - Global Precipitation Index based on 275 K

Surface products

91

sst_clr - mean SST from clear pixels

92

sst_std_clr - standard deviation of SST from clear pixels

93

ndvi_clr - mean NDVI from clear pixels

94

ndvi_std_clr - standard deviation of NDVI from clear pixels

95

lst_clr - LST from clear pixels

96

lst_std_clr - standard deviation of LST from clear pixels

97

ist_clr - IST from clear pixels

98

ist_std_clr - standard deviation of IST from clear pixels

99

tsfc_interpol - surface temperature interpolate from surrounding clear pixels

100

tpw_interpol - tpw interpolated from surrounding clear pixels

127

sst_back - climatological SST (K)

128

ndvi_back - climatological NDVI

29

fire_pixel_frac - fraction of clear pixels thought to include fire

Derived Radiance Products

157

ch1_sfc - mean atmopsherically corrected ch1 reflectance (0-100%)

158

ch2_sfc - mean atmospherically corrected ch2 reflectanc (0-100%)

159

ch1_dark_sfc - atmospherically corrected ch1 reflectance from darkest pixel in cell (0-100%)

160

ch2_dark_sfc - atmospherically corrected ch2 reflectance from darkest pixel in cell (0-100%)

161

ch4_warm - ch4 brightness temperature from warmest pixel in the cell (K)

179

ch1_sfc_cc - atmospherically corrected ch1 reflectance dark composite (0-100%)

180

ndvi_sfc_cc - ndvi from greenest composite

181

ch3b_sfc - atmospherically corrected ch3b radiance

182

ch4_sfc

183

ch5_sfc

184

ch3b_ref_sfc - atmospherically corrected ch3b reflectance

185

ch3b_clr_sfc - atmospherically corrected ch3b clear-sky radiance

186

ch4_clr_sfc

187

ch5_clr_sfc

188

ch3b_ref_clr_sfc - atmospherically corrected ch3b clear-sky reflectance

191

ch3b_ems - mean ch3b emissivity

192

ch3b_ems_clr - mean ch3b emissivity from clear pixels

193

ch3b_ems_sfc - mean ch3b emissivity from atmospherically corrected radiances

194

ch3b_ems_clr_sfc - mean ch3b emissivity from atmospherically corrected radiances for clear-sky

137

ch1_clr_sfc - mean atmospherically corrected ch1 reflectance for clear pixels (0-100%)

138

ch2_clr_sfc - mean atmospherically correction ch2 reflectance for clear pixels (0-100%)

139

ndvi_clr_sfc - mean NDVI derived from atmospherically corrected reflectance (derived from pixel data)

Replicated NWP Products

170

tsfc_nwp - surface skin temperature from NWP fields (K)

171

tair_nwp - surface air temperature from NWP fields (K)

172

tpw_nwp - total precipitable water from NWP fields (cm)

173

weasd_nwp - water equivalent snow depth from NWP fields (?)

174

ch4_nwp_clr - modelled mean ch4 clear radiance from NWP and CRTM (mW/cm^2/cm^-1)

175

ch5_nwp_clr - modelled mean ch5 clear radiance from NWP and CRTM (mW/cm^2/cm^-1)

189

u_wnd_10m_nwp - U-component of wind at 10 m from NWP (m/s)

190

v_wnd_10m_nwp - V-component of wind at 10 m from NWP (m/s)

201

ttrop_nwp - Tropopause temperature (K)