VIIRS/NPP Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Night
Product Identifier: VNP21A1N
Description:
The VIIRS/NPP Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Night product (VNP21A1N) is a global HDFEOS Grid Structure file that contains one cell of a sinusoidal projection of accumulated nighttime Land Surface Temperature and Emissivity data. This projection is also known as the MODLAND Sinusoidal Grid (see https://modis-land.gsfc.nasa.gov/MODLAND_grid.html.) The source of this product is nighttime data from the VIIRS/NPP Land Surface Temperature and Emissivity 6-Min L2 Swath 750m (VNP21) products over a period of one day.
Point of Contact:
Glynn C. Hulley (PI)
glynn.hulley@jpl.nasa.gov
Principal Investigator(s):
Glynn C. Hulley (PI)
MS 183-509
Jet Propulsion Laboratory
4800 Oak Grove Dr.
Pasadena, CA 91109
Email: glynn.hulley@jpl.nasa.gov
Office: (818) 354-2979
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General Construct
dimensions:
XDim=1200
YDim=1200
variables:
uint8 Emis_14(YDim, XDim) ;
Emis_14:_Fillvalue = 0 ;
Emis_14:add_offset = 0.49 ;
Emis_14:long_name = Daily Band 14 emissivity ;
Emis_14:scale_factor = 0.002 ;
Emis_14:units = n/a ;
Emis_14:valid_range = 1,255 ;
uint8 Emis_15(YDim, XDim) ;
Emis_15:_Fillvalue = 0 ;
Emis_15:add_offset = 0.49 ;
Emis_15:long_name = Daily Band 15 emissivity ;
Emis_15:scale_factor = 0.002 ;
Emis_15:units = n/a ;
Emis_15:valid_range = 1,255 ;
uint8 Emis_16(YDim, XDim) ;
Emis_16:_Fillvalue = 0 ;
Emis_16:add_offset = 0.49 ;
Emis_16:long_name = Daily Band 16 emissivity ;
Emis_16:scale_factor = 0.002 ;
Emis_16:units = n/a ;
Emis_16:valid_range = 1,255 ;
uint16 LST_1KM(YDim, XDim) ;
LST_1KM:_Fillvalue = 0 ;
LST_1KM:add_offset = 0.0 ;
LST_1KM:long_name = Daily 1km Land Surface Temperature (LST) ;
LST_1KM:scale_factor = 0.02 ;
LST_1KM:units = K ;
LST_1KM:valid_range = 7500,65535 ;
uint16 QC(YDim, XDim) ;
QC:QA Legend = "Bit Fields Description (Right to Left):\n",
"[0-1]: MODLAND_QA:\n",
" 00: Pixel produced, good quality\n",
" 01: Pixel produced, but check other QA\n",
" 10: Pixel not produced due to cloud\n",
" 11: Pixel not produced due to other reasons than clouds\n",
"\n",
"[2-3]: Data Quality Flag:\n",
" 00: Good data quality of L1B bands 14,15,16\n",
" 01: Missing Pixel\n",
" 10: Fairly calibrated\n",
" 11: Poorly calibrated, TES processing skipped\n",
"\n",
"[4-5]: Cloud Flag:\n",
" 00: Cloud free\n",
" 01: Thin Cirrus\n",
" 10: Pixel within 2 pixels of nearest cloud (~2km)\n",
" 11: Cloudy pixel\n",
"\n",
"[6-7]: Iterations:\n",
" 00: >=7 (Slow convergence)\n",
" 01: = 6 (Nominal)\n",
" 10: = 5 (Nominal)\n",
" 11: = <5 (Fast)\n",
"\n",
"[8-9]: Atmospheric Opacity:\n",
" 00: >=3 (Warm, humid air; or cold land)\n",
" 01: 0.2 - 0.3 (Nominal value)\n",
" 10: 0.1 - 0.2 (Nominal value)\n",
" 11: <0.1 (Dry, or high altitude pixel)\n",
"\n",
"[10-11]: MMD:\n",
" 00: > 0.15 (Most silicate rocks)\n",
" 01: 0.1 - 0.15 (Rocks, sand, some soils)\n",
" 10: 0.03 - 0.1 (Mostly soils, mixed pixel)\n",
" 11: <0.03 (Vegetation, snow, water, ice, some soils)\n",
"\n",
"[12-13]: Emissivity accuracy:\n",
" 00: >0.02 (Poor performance)\n",
" 01: 0.015 - 0.02 (Marginal performance)\n",
" 10: 0.01 - 0.015 (Good performance)\n",
" 11: <0.01 (Excellent performance)\n",
"\n",
"[14-15]: LST accuracy:\n",
" 00: >2K (Poor performance)\n",
" 01: 1.5 - 2K (Marginal performance)\n",
" 10: 1 - 1.5K (Good performance)\n",
" 11: < 1K (Excellent performance)\n" ;
QC:_Fillvalue = n/a ;
QC:add_offset = 0.0 ;
QC:long_name = Daily QC for LST and emissivity ;
QC:scale_factor = 1.0 ;
QC:units = n/a ;
QC:valid_range = 0,65535 ;
uint16 View_Angle(YDim, XDim) ;
View_Angle:_Fillvalue = 255 ;
View_Angle:add_offset = -65.0 ;
View_Angle:long_name = View zenith angle of LST ;
View_Angle:scale_factor = 1.0 ;
View_Angle:units = deg ;
View_Angle:valid_range = 0,130 ;
uint16 View_Time(YDim, XDim) ;
View_Time:_Fillvalue = 255 ;
View_Time:add_offset = 0.0 ;
View_Time:long_name = Time of LST observation ;
View_Time:scale_factor = 0.1 ;
View_Time:units = hrs ;
View_Time:valid_range = 0,240 ;