Specification of SGLI NRT data

1. Correspondence between SGLI NRT and MODIS NRT (Aug. 09, 2019 Update)

Table 1. SGLI Near Realtime data
No. Geophysical Variables Filename
YYYY:year, MM:month, DD:day, hh:hour, mm:minutes (Start time of the data)
PPP:Path number,
X: Process flag(L:Near-realtime(Japan station),N:Near-realtime(Svalbard station),G:Standard)
VVVV:Algorithm version, NN:Area number (View Fig.1 and Fig.2)
Variable name Format Day
/Night		 Sample data
Attribute value Explanation
1 Top of the atmosphere (TOA) radaince GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN01_NN.nc TOA radiance of VN01 Radiance at VN01 (380nm) netCDF D Area 11, ALL RGB Image
 R:VN08
 G:VN05
 B:VN03
2 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN02_NN.nc TOA radiance of VN02 Radiance at VN02 (412nm) netCDF D Area 11, ALL
3 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN03_NN.nc TOA radiance of VN03 Radiance at VN03 (443nm) netCDF D Area 11, ALL
4 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN04_NN.nc TOA radiance of VN04 Radiance at VN04 (490nm) netCDF D Area 11, ALL
5 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN05_NN.nc TOA radiance of VN05 Radiance at VN05 (530nm) netCDF D Area 11, ALL
6 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN06_NN.nc TOA radiance of VN06 Radiance at VN06 (565nm) netCDF D Area 11, ALL
7 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN07_NN.nc TOA radiance of VN07 Radiance at VN07 (673.5nm) netCDF D Area 11, ALL
8 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN08_NN.nc TOA radiance of VN08 Radiance at VN08 (673.5nm) netCDF D Area 11, ALL
9 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN09_NN.nc TOA radiance of VN09 Radiance at VN09 (763nm) netCDF D Area 11, ALL
10 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN10_NN.nc TOA radiance of VN10 Radiance at VN10 (868.5nm) netCDF D Area 11, ALL
11 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_VNRDQ_VVVV_Lt_VN11_NN.nc TOA radiance of VN11 Radiance at VN11 (868.5nm) netCDF D Area 11, ALL
12 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_SW01_NN.nc TOA radiance of SW01 Radiance at SW01 (1050nm) netCDF D Area 11, ALL
13 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_SW02_NN.nc TOA radiance of SW02 Radiance at SW02 (1380nm) netCDF D Area 11, ALL
14 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_SW03_NN.nc TOA radiance of SW03 Radiance at SW03 (1630nm) netCDF D Area 11, ALL
15 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_SW04_NN.nc TOA radiance of SW04 Radiance at SW04 (2210nm) netCDF D Area 11, ALL
16 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_TI01_NN.nc
GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSNQ_VVVV_Lt_TI01_NN.nc		 TOA radiance of TI01 Radiance at TI01 (10.8μm) netCDF D/N Area 11, ALL
17 GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSDQ_VVVV_Lt_TI02_NN.nc
GC1SG1_YYYYMMDDhhmm0PPP00_1BMX_IRSNQ_VVVV_Lt_TI02_NN.nc		 TOA radiance of TI02 Radiance at TI02 (12.0μm) netCDF D/N Area 11, ALL
18 Normalized Water
Leaving Radiance		 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_380_NN.nc Normalized Water Leaving Radiance(NWLR) at 380.0 nm NWLR at 380.0nm netCDF D Area 11, ALL RGB Image
 R:NWLR_670
 G:NWLR_565
 B:NWLR_490
19 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_412_NN.nc Normalized Water Leaving Radiance(NWLR) at 412.0 nm NWLR at 412.0nm netCDF D Area 11, ALL
20 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_443_NN.nc Normalized Water Leaving Radiance(NWLR) at 443.0 nm NWLR at 443.0nm netCDF D Area 11, ALL
21 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_490_NN.nc Normalized Water Leaving Radiance(NWLR) at 490.0 nm NWLR at 490.0nm netCDF D Area 11, ALL
22 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_530_NN.nc Normalized Water Leaving Radiance(NWLR) at 530.0 nm NWLR at 530.0nm netCDF D Area 11, ALL
23 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_565_NN.nc Normalized Water Leaving Radiance(NWLR) at 565.0 nm NWLR at 565.0nm netCDF D Area 11, ALL
24 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_NWLR_670_NN.nc Normalized Water Leaving Radiance(NWLR) at 673.5 nm NWLR at 673.5nm netCDF D Area 11, ALL
25 Photosynthetically Available Radiation GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_PAR_NN.nc Photosynthetically Available Radiation PAR netCDF D Area 11, ALL Browse
Image
26 Aerosol Optical Thickness GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_TAUA_670_NN.nc Aerosol Optical Thickness(TauA) at 673.5 TauA at VN07 (673.5nm) netCDF D Area 11, ALL Browse
Image
(673.5nm)
27 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_TAUA_865_NN.nc Aerosol Optical Thickness(TauA) at 868.5 TauA at VN10 (865.5nm) netCDF D Area 11, ALL
28 Floating Algae Index GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_NWLRQ_VVVV_FAI_NN.nc Floating Algae Index FAI netCDF D Area 09, Browse
Image
29 Ocean Color GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_IWPRQ_VVVV_CDOM_NN.nc Colored dissolved organic matter (CDOM) at 443nm Colored dissolved organic matter netCDF D Area 11, ALL Browse
Image
(CHLA)
30 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_IWPRQ_VVVV_CHLA_NN.nc Chllorophyll-a concentration (CHLA) Chlorophyll-a concentration netCDF D Area 11, ALL
31 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_IWPRQ_VVVV_TSM_NN.nc Total suspended matter (TSM) Total suspended matter netCDF D Area 11, ALL
32 Sea Surface Temperature GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_SSTDQ_VVVV_NN.nc
GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_SSTNQ_0006_NN.nc		 Sea Surface Temperature[SST] Sea Surface Temperature netCDF D/N Area 11, ALL Browse
Image
(Day)
33 Sea-ice and
snow cover distribution		 GC1SG1_YYYYMMDDhhmm0PPP00_L2MX_OKIDQ_VVVV_NN.nc
  • Bit-0:C1 algorithm process
  • 1-3:cloudy/clear flag
    • Bit1-3=000: Complete cloud
    • Bit1-3=001, 010: High confident cloud
    • Bit1-3=011, 100: Mid confident cloud
    • Bit1-3=101, 110: Low confident cloud
    • Bit1-3=111: Complete clear
  • 4:day/night flag
    • 0: night, 1: day
  • 5:land/water flag
    • 0: water, 1: land
  • 6-8:snow/ice flag
    • Bit5=0 & Bit6-8=000: Snow over sea ice
    • Bit5=0 & Bit6-8=010: Bare sea ice
    • Bit5=0 & Bit6-8=001: Open ocean
    • Bit5=1 & Bit6-8=001: Land
    • Bit5=1 & Bit6-8≠001: Snow over land
  • 9:cloud shadow flag
    • 0: no shadow, 1: cloud shadow
  • 10:radiance saturation
    • 0: no saturation, 1: saturation
  • 11:sun-glint
    • 0: no sun-glint, 1: sun-glint
  • 12-14:missing channel (VN,SW,IR)
    • Bit12=1: VN is missing
    • Bit13=1: SW is missing
    • Bit14=1: IR is missing
  • 15:error
    • 0: no error, 1: error
 Sea-ice and snow cover distribution netCDF D Area 11, ALL Browse
Image
  • Note1: Obs_time, Sensor_zimuth, Sensor_zenith, Solar_azimuth, Solar_zenith, Land_water_flag and QA_flag are stored in "(L1B filename)_GEOT.nc" as geometric and quality information data.
  • Note2: Obs_time and QA_flag are stored in "(Level-2 products filename)_GEOT.nc" as geometric and quality information data.
  • Note3: Spatial resolution of all SGLI near realtime data is 250 meter.
  • Note4: Format of SGLI near realtime data is netCDF4.
  • Note5: "NN" in the filename denotes the number of tiling areas or "Japan".
Fig. 2 Definition of Japan area for SGLI Near Realtime data (24N-50N,123E-150E)
Fig.1 Definition of tile area for SGLI Near Realtime Data (16-tiles, 20N-60N, 115E-155E)
Table 2 Correspondence table between MODIS Near Realtime data and SGLI Near Realtime data
(Variables shown in grey color are not available as SGLI data. Variables shown in yellow are also not available but alternative variables shown in the last column are available)
No. Geophysical Variables Filename Explanation Format Day
/Night		 Correspondence
1 Sea Surface Temperature A2GL1*_08000_05300_sst.gz Binary data convereted from the output of level-2 SST algorithm (fixed region) Binary with 1-line header D/N Table 1- No.31
2 A2GL1*(scene size)_sst.gz Binary data convereted from the output of level-2 SST algorithm (scene) Binary with 1-line header D/N
3 A2GL1*sst_nn.gz Tiled binary data converted from the output of level-2 SST algorithm (12 tiles) Binary with 1-line header D/N Table 1- No.31
4 Chlorophyll-a concentration A2GL1*chla.gz Binary data convereted from the output of level-2 Chlorophyll-a algorithm Binary with 1-line header D Table 1- No.29
5 A2GL1*chla_nn.gz Tiled binary data converted from the output of level-2 Chlorophyll-a algorithm (12 tiles) Binary with 1-line header D Table 1- No.29
6 M?D02HKM*_Japan_chla.gz Output of Chlorophyll-a algorithm at 500 m spatial resolution (Japan area) Binary with 1-line header D Not available
7 M?D02HKM*_AreaName_chla.gz Output of Chlorophyll-a algorithm at 500 m spatial resolution (local areas) Binary with 1-line header D Not available
8 Rayleigh-corrected reflectance and Chlorophyll-a concentration M?D02HKM*SR16.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 500 m spatial resolution (around Japan) HDF4 D Table 1- No.21-24 as alternatives
9 M?D02HKM*FR16.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 500 m spatial resolution (Fukutokuokanoba area) HDF4 D Not available
10 M?D02HKM*OR16.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 500 m spatial resolution (Ogasawara-Nishinoshima area) HDF4 D Not available
11 M?D02QKM*SR02.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 250 m spatial resolution (around Japan) HDF4 D Table 1- No.21-24 as alternatives
12 M?D02QKM*FR02.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 250 m spatial resolution (Fukutokuokanoba area) HDF4 D Not available
13 M?D02QKM*OR02.hdf.gz HDF formated output of Rayleigh-corrected reflectance and Chlorophyll-a algorithm at 250 m spatial resolution (Ogasawara-Nishinoshima area) HDF4 D Not available
  • Note1: "*" in the filename denotes observation date and times.
  • Note2: "?" in the filename denotes satellite ID of MODIS (ie., "O" for Terra and "Y" for Aqua)
Fig. 3 Definition of tile area for SGLI Near Realtime Data (12 tiles, 20N-50N, 115E-155E)

2. netCDF Viewer

3. SGLI reference infomation