Difference between revisions of "MODIS LST"

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MOD11A1 - MODIS Land Surface Temperature Product
 
MOD11A1 - MODIS Land Surface Temperature Product
  
−
6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data
+
== 6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data ==
  
−
Version 5 data seems to be complete on LPDAAC datapools (and ftp)
+
*Version 5 data seems to be complete (ie 2000 to 2009) on LPDAAC datapools (an ftp)
−
Data Size is 3 to 6 MB per granule.  For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB
+
 
−
Projected data is similar in size.
+
*Data Size is 3 to 6 MB per granule.  For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB
−
Total Space between 60 and 120 GB
+
 
 +
*We are using 1km because this is the native resolution
 +
 
 +
*Prior projection took 30 seconds. Assume swamped system takes 2 minutes per hdf file.  2 min, 9 years, 365 days
 +
 
 +
*Projected data is similar in size so total disk space = 60 and 120 GB
 +
 
 +
*Steps are 1) Catalog 2) Acquire 3) Project
 +
 
 +
*Current problem with search for projection - Peter is debugging(done!!)
  
 
NASA data products homepage for LST [http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php?MOD_NUMBER=11]
 
NASA data products homepage for LST [http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php?MOD_NUMBER=11]
 
DAAC description [https://lpdaac.usgs.gov/lpdaac/products/modis_products_table/land_surface_temperature_emissivity/daily_l3_global_1km/v5/terra]
 
DAAC description [https://lpdaac.usgs.gov/lpdaac/products/modis_products_table/land_surface_temperature_emissivity/daily_l3_global_1km/v5/terra]
  
 +
{| border="1" style="text-align:center"
 
!Science Data Sets (HDF Layers) !! UNITS !! BIT TYPE !! FILL !! VALID RANGE !! MULTIPLY BY SCALE FACTOR
 
!Science Data Sets (HDF Layers) !! UNITS !! BIT TYPE !! FILL !! VALID RANGE !! MULTIPLY BY SCALE FACTOR
−
|LST_Day_1km: || Daily daytime 1km grid land surface temperature || Kelvin || 16-bit unsigned integer  || 0  || 7500–65535  || 0.02
+
|-
−
|QC_Day: || Quality control for daytime LST and emissivity  || Bit Field  || 8-bit unsigned integer See QA NOTE 0–255 na
+
|LST_Day_1km: Daily daytime 1km grid land surface temperature|| Kelvin || 16-bit unsigned integer  || 0  || 7500–65535  || 0.02
−
|Day_view_time: || Time of daytime land surface temperature observation || Hours  || 8-bit unsigned integer  || 255 ||  0–240 0.1
+
|-
−
|Day_view_angle:  || View zenith angle of daytime land surface temperature || Degree  || 8-bit unsigned integer  || 255 || 0–130 1 (- 65)
+
|QC_Day: Quality control for daytime LST and emissivity  || Bit Field  || 8-bit unsigned integer || See QA NOTE || 0–255 || na
−
|LST_Night_1km:  || Daily nighttime 1km grid land surface temperature || Kelvin  || 16-bit unsigned integer  || 0 || 7500–65535 0.02
+
|-
−
|QC_Night: || Quality control for nighttime LST and emissivity || Bit Field  || 8-bit unsigned integer See QA NOTE || 0–255  || na
+
|Day_view_time: Time of daytime land surface temperature observation || Hours  || 8-bit unsigned integer  || 255 ||  0–240 || 0.1
−
|Night_view_time:  || Time of nighttime land surface temperature observation || Hours ||  8-bit unsigned integer  || 255  || 0–240 0.1
+
|-
−
|Night_view_angle:  || View zenith angle of nighttime land surface temperature || Degree || 8-bit unsigned integer  || 255 0–130  || 1 (-65)
+
|Day_view_angle:  View zenith angle of daytime land surface temperature|| Degree  || 8-bit unsigned integer  || 255 || 0–130 || 1 (- 65)
−
|Emis_31:  || Band 31 Emissivity  || none  || 8-bit unsigned integer  || 0  || 1–255  || 0.0020 (+ 0.49)
+
|-
−
|Emis_32:  || Band 32 Emissivity || none 8-bit unsigned integer  || 0  || 1–255  || 0.0020 (+ 0.49)
+
|LST_Night_1km:  Daily nighttime 1km grid land surface temperature ||Kelvin  || 16-bit unsigned integer  || 0 || 7500–65535|| 0.02
−
|Clear_day_cov:  || day clear sky coverage  || None 16-bit unsigned integer 0  || 1–65535  || 0.00004
+
|-
−
|Clear_night_cov: || night clear sky coverage  || None  || 16-bit unsigned integer  || 0  || 1–65535  || 0.00004
+
|QC_Night:  Quality control for nighttime LST and emissivity || Bit Field  || 8-bit unsigned integer || See QA NOTE || 0–255  || na
 +
|-
 +
|Night_view_time:  Time of nighttime land surface temperature observation || Hours ||  8-bit unsigned integer  || 255  || 0–240 || 0.1
 +
|-
 +
|Night_view_angle:  View zenith angle of nighttime land surface temperature || Degree || 8-bit unsigned integer  || 255 || 0–130  || 1 (-65)
 +
|-
 +
|Emis_31:  Band 31 Emissivity  || none  || 8-bit unsigned integer  || 0  || 1–255  || 0.0020 (+ 0.49)
 +
|-
 +
|Emis_32:  Band 32 Emissivity || none || 8-bit unsigned integer  || 0  || 1–255  || 0.0020 (+ 0.49)
 +
|-
 +
|Clear_day_cov:  day clear sky coverage  || None || 16-bit unsigned integer || 0  || 1–65535  || 0.00004
 +
|-
 +
|Clear_night_cov:  night clear sky coverage  || None  || 16-bit unsigned integer  || 0  || 1–65535  || 0.00004
 +
|}

Latest revision as of 16:03, 16 June 2009

MOD11A1 - MODIS Land Surface Temperature Product

6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data

  • Version 5 data seems to be complete (ie 2000 to 2009) on LPDAAC datapools (an ftp)
  • Data Size is 3 to 6 MB per granule. For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB
  • We are using 1km because this is the native resolution
  • Prior projection took 30 seconds. Assume swamped system takes 2 minutes per hdf file. 2 min, 9 years, 365 days
  • Projected data is similar in size so total disk space = 60 and 120 GB
  • Steps are 1) Catalog 2) Acquire 3) Project
  • Current problem with search for projection - Peter is debugging(done!!)

NASA data products homepage for LST [1] DAAC description [2]

Science Data Sets (HDF Layers) UNITS BIT TYPE FILL VALID RANGE MULTIPLY BY SCALE FACTOR
LST_Day_1km: Daily daytime 1km grid land surface temperature Kelvin 16-bit unsigned integer 0 7500–65535 0.02
QC_Day: Quality control for daytime LST and emissivity Bit Field 8-bit unsigned integer See QA NOTE 0–255 na
Day_view_time: Time of daytime land surface temperature observation Hours 8-bit unsigned integer 255 0–240 0.1
Day_view_angle: View zenith angle of daytime land surface temperature Degree 8-bit unsigned integer 255 0–130 1 (- 65)
LST_Night_1km: Daily nighttime 1km grid land surface temperature Kelvin 16-bit unsigned integer 0 7500–65535 0.02
QC_Night: Quality control for nighttime LST and emissivity Bit Field 8-bit unsigned integer See QA NOTE 0–255 na
Night_view_time: Time of nighttime land surface temperature observation Hours 8-bit unsigned integer 255 0–240 0.1
Night_view_angle: View zenith angle of nighttime land surface temperature Degree 8-bit unsigned integer 255 0–130 1 (-65)
Emis_31: Band 31 Emissivity none 8-bit unsigned integer 0 1–255 0.0020 (+ 0.49)
Emis_32: Band 32 Emissivity none 8-bit unsigned integer 0 1–255 0.0020 (+ 0.49)
Clear_day_cov: day clear sky coverage None 16-bit unsigned integer 0 1–65535 0.00004
Clear_night_cov: night clear sky coverage None 16-bit unsigned integer 0 1–65535 0.00004
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